The effect of a national education policy on language test performance: a fairness perspective
© Song and He.; licensee Springer. 2015
Received: 13 October 2014
Accepted: 15 December 2014
Published: 15 February 2015
Project 211 is one of the most important educational policies in China, which aims at selecting a small number of “key universities” for sustainable development in the 21st century. These selected “key universities” have received substantial funding from the government so they can recruit outstanding faculty and be equipped with high quality facilities. Although this national policy has come into being for more than a decade, limited empirical studies have been conducted to examine how the policy influences students’ performance as well as whether the policy is perceived to interfere with test fairness. Using differential item analysis (DIF) and content analysis, this study examined the effect of group membership (key vs. non-key universities) on one of the large-scale high-stakes language tests–the Graduate School Entrance English Examination (GSEEE). The results identified a number of DIF/DBF, all favoring test takers from key universities. A review of the flagged items by three test reviewers found a myriad of potential factors including unbalanced learning opportunities, which may contribute to performance differences between two groups. However, none of the reviewers deemed that unbalanced educational opportunities brought bias and presented a threat to fairness. Fairness in this context is conceptualized to require individuals or groups who are less well-off to sacrifice social benefits and resources to those who are better off to achieve the overarching aim of maximizing economic benefit to the society.
Project 211 is one of the important national education policies in China. Launched in 1993 by the Ministry of Education of People’s Republic of China, it aims at curbing the regional gap and improving the quality of higher education, scientific research, administration, and institutional efficiency as a basis for training higher-level professional manpower for China and strengthening those institutions and disciplines as a national priority in higher education (Liu 2009). According to this policy, there are two types of universities in the Chinese higher educational system: key and non-key universities. Colleges and universities are assessed by various criteria such as staffing, buildings, libraries, laboratories, research, funds, and prestige in specified disciplines to determine whether they are “qualified” to be included as top institutions (Huang 2008). After several rounds of evaluation, among 1700 colleges and universities across China, about 113 universities have been selected as key universities. Most key universities are located in the eastern economic-developed urban areas. The central government has provided tremendous funding with these selected key universities so they can be equipped with better facilities and be able to recruit outstanding teachers, scholars, and researchers in different areas and disciplines (Mok 2006).
Although this national policy has come into being for more than a decade, there have been limited empirical studies investigating how the policy influences student language test performance as well as whether this policy is perceived to interfere with the fairness of large-scale high-stakes language testing in China. In language testing, one aspect that has attracted much attention is opportunity to learn in the discussion of test fairness (Kunnan 2008). While some researchers and testing specialists dismiss it in discussing test fairness (Willingham and Cole 1997; Xi 2010), more and more researchers believe that a fair test should be accessible to all test takers in terms of learning opportunities since what test takers know and can do in any testing situations rely on the educational opportunities offered to test takers (Stobart 2005; Pullin and Haertel 2008). According to Gipps and Stobart (2009), issues of test fairness are bound to the joint consideration of various educational values and arguments in the content of historical perspectives. Considering the key role of high-stakes testing in the Chinese educational system (Berry 2011), whether and how university types interacted with language test performance has important implications in exploring fairness across a large country of China.
How do the GSEEE items and bundles, if any, exhibit differential functioning toward test taker groups who are from key or non-key universities?
Do test reviewers perceive opportunity to learn due to the university type as one of the possible causes for the differentially functioning GSEEE items and bundles? If so, is opportunity to learn linked to the potential bias?
Opportunity to learn (OTL), educational policy, and test performance
An essential goal of high-stakes testing is to provide all test takers with equal, comparable opportunities to demonstrate what they know and can do. The literature in the West generally has a consensus about the fair treatment of all test takers on test design, development, administration, scoring, and score-based use for decision making (AERA, APA, & NCME, 2014; ILTA, 2004; McNamara and Ryan 2011). Increasingly, researchers also argue that fair testing needs to address inequitable distribution of educational resources and access to knowledge (Kunnan 2008) and opportunity to learn (OTL) falls within the scope of test fairness discussions (Pullin and Haertel 2008). This controversy makes it necessary to examine, in the Chinese context, whether differences in the educational experiences of different groups of students, as a result of educational policies, may cause differences in test performance, as well as whether such group performance differences are perceived to interfere with appropriate interpretation of test scores used for education and decision making. The Chinese language testing context presents a novel perspective as limited research has been conducted in this area.
The previous literature has indicated that educational polices impact OTL for different groups of students. For instance, advanced in 2001 in the U.S., No Child Left Behind (NCTB) Act mandates testing for all students in grades 3 through grade 8 each year and at least one during high school in the United States. This act has been spreading great controversies. Critics expressed concern that the policy perpetuated poverty and disadvantage and score differences, providing rich and poor schools with stark contrasts in learning environments and physical surroundings (Darling-Hammond 2000). Another example is Norway, in which egalitarian society with strong socio-democratic traditions, economic and cultural equality have been highly promoted in its political agenda (Carlson 2009). In 2003, the new government took initiatives to develop national testing focusing on pedagogical and public reporting functions. The introduction of national testing received a strong negative public reaction due to a fear that it was believed the national testing would contribute to increased differences between the rich and the poor (including score differences), which is against its socio-democratic traditions.
Substantial empirical studies documented the influence of OTL variables on students’ test scores (Boscardin et al. 2005; Aguirre-Muñoz and Boscardin 2008). Wang (1998) examined four dimensions of OTL: content coverage, content exposure, content emphasis, and quality of instructional delivery. Results found that OTL variables were significant predictors of both written and hands-on test scores as well as variation in the effects of OTL attributable to differences in test format. Specifically, students who received longer engaged time on specific content in the classroom were likely to perform better on written tests than those who did not, and students who received better quality of instructional delivery were likely to perform better on the hands-on tests. Using interviews, Walpole et al. (2005) investigated urban African and Latino high school students’ perceptions, test preparation, information sources, and strategies towards the college admission tests such as SAT and ACT. Findings showed that the African American and Latino students were generally lack of information and lack of resources to pay for tests and test preparation, as a result, they perceived that they did not have adequate and equal opportunity to demonstrate their knowledge and perform at their best.
Differences in OTL and test performance have repeatedly been reported to be associated with learner characteristics such as language background and disability. Abedi (2005) illustrated the challenges of assuring fair and valid testing for the English language learner (ELL) population under the current legislation of NCLB. Using SIBTEST, Finch, Barton, and Meyer (2009) examined whether a large-scale high-stakes test measured the construct of interest equally well for all test takers receiving accommodations and those not receiving accommodations. The study found accommodations appeared to have been detrimental in performance on certain type of test items, perhaps placing too great a cognitive burden on accommodated test takers. Kong (2009) investigated the effect of test taker geographic location on the reading comprehension section of the Test for English Majors Band 4 (TEM-4) in China. A total of eight universities located in the eastern economic-developed area and western underdeveloped area (4 each) were selected. It was unclear on what criteria those universities were chosen for the two categories. T-tests showed no significant differences in reading comprehension between test takers from developed and less developed areas. Using SIBTEST, the study found one item with C-level DIF favoring the developed area and no DBF was found. Expert review with the DIF items pointed out the potential reason for DIF existence might be related with vocabulary knowledge. The study, therefore, concluded that no bias existed with the TEM-4.
Differential item functioning
Differential item functioning (DIF) explores whether test items function differentially across different groups of test takers who are matched on ability. DIF exists when groups of test takers with equal ability have differing response probabilities of either a) successfully answering an item (i.e., in multiple choice) or b) receiving the same item score (i.e., in performance assessment) (Zumbo, 2007). The general cause of DIF is that test items measure “at least one secondary dimension in addition to the primary dimension the item is intended to measure” (Roussos and Stout, 2004, p.108). Secondary dimensions are further categorized as either auxiliary dimensions that are part of the construct intended to be measured or nuisance dimensions that are not intended to be measured. Bias, thus, might occur if the existence of DIF is due to the situation that test items measure nuisance dimensions that are not relevant to the underlying ability of interest. One of the approaches to DIF detection is the traditional, exploratory approach which is conducted in two steps: statistical identification of items that favour particular groups followed by a substantive review of potentially biased items to locate the sources of DIF (Gierl, 2005). This traditional, exploratory approach has been widely used in the previous empirical studies (Ferne and Rupp, 2007; Geranpayeh and Kunnan 2007).
To conduct the first step, several statistical procedures have been developed, including the Mantel-Haenszel method (MH), logistic regression (LR), the standardization procedure, and IRT (see a review by Clauser and Mazor, 1998). Developed by Shealy and Stout (1993), Simultaneous Item Bias test (SIBTEST) is a nonparametric procedure to estimate DIF in an item or bundle of items. Test takers are compared based on their membership in either the reference or focal group (e.g., test takers from key or non-key universities), where the suspicion is that the focal group might be disadvantaged on test items due to DIF. Items (bundles) on the test are divided into two subsets, the suspect subtest and the matching subtest. The suspect subtest consists of those items suspected of measuring the primary and secondary dimensions; and the matching subtest contains items believed to measure only the primary dimension.
Fundamentally, SIBTEST examines the ratio of the weighted difference in proportion correct (for reference and focal group member) to its standard error. DIF occurs 1) if an item is sensitive to both the primary dimension and a secondary dimension and 2) if the reference and focal groups that have been equated on the primary dimension differ in distribution on a secondary dimension (Rousos and Stout 1996a). The SIBTEST procedure can be used to determine the extent of the DIF, and classify items as having either negligible (A-level) DIF, moderate (B-level) DIF, or large (C-level) DIF (Roussos and Stout 1996b).
SIBTEST has become one of the more popular DIF procedures. First, SIBTEST has been proven to be a powerful DIF procedure (Penfield and Lam 2000). Zheng, Gierl, and Cui (2007) investigated the consistencies and effect size of three DIF procedures: MH, SIBTEST, and LR. Results showed consistent estimates on the magnitude and direction of DIF among the three DIF procedures. Second, SIBTEST uses a regression estimate of the true score based on iterative purification instead of an observed score as the matching variable. As a result, test takers are matched on an estimated ability score rather than an observed score, which increases the accuracy of the matching variable. Third, SIBTEST can be used to explore differential functioning at the item and bundle levels. Since SIBTEST is one of a few procedures that can evaluate bundle DIF (DBF), it provides increased power through more effectively controlled Type I error. Items with small but systematic DIF may very often go statistically unnoticed, but when combined at the bundle level, DIF may be detected (Roznowski and Reith 1999; Takala and Kaftandjieva 2000). Examining DBF becomes necessary to completely understand the influence of grouping variables on test performance, especially when important, although perhaps subtle, secondary dimensions associated with different bundles have been found in tests (Douglas et al. 1996).
The substantive analysis is then conducted after the statistical DIF analysis. While DIF analyses identify differential performance across items, substantive analyses are required to determine the likely causes of the DIF and whether those causes are connected with the potential bias. The substantive analysis usually involves item reviews by subject-area experts (e.g., curriculum specialists or item writers) in an attempt to interpret the factors that may contribute to differential performance between specific groups of test takers. A DIF item is potentially biased when reviewers identify the DIF sources that are due to components irrelevant to the construct measured by the test, placing one group of test takers at a disadvantage. Exploratory DIF analyses have been widely used in previous empirical studies, despite the situation that content analysis may not always provide conclusive answers regarding DIF sources and test reviewers cannot determine decisively that the existence of DIF and DBF is due to bias (Geranpayeh and Kunnan 2007; Uiterwijk and Vallen 2005).
The study used the GSEEE item-level data from one major university in Southern China. Using data of the 2009 administration, the applicants’ background information and their GSEEE item scores were collected through one of the provincial NEEA branches. Data from a random stratified sample of 13,745 applicants (test takers) were obtained, with 57.5% of the test takers being male and 42.5%, female. Approximately 8.4% of the test takers studied in the Humanities (e.g., literature, history, and philosophy), 16.3% in the Social Sciences (e.g., economics, psychology, and management), and 75.3% in the Natural and Applied Sciences (e.g., physics, chemistry, biology, and computer sciences). Such information was similar to the demographic information of the whole school and the overall GSEEE testing population (Ministry of Education 2009).
Description of the GSEEE administered in 2009
Part and item
Text (Items 1–20)
Part A Text 1 (Items 21–25)
Part A Text 2 (Items 26–30)
Part A Text 3 (Items 31–35)
Education and economic growth
Part A Text 4 (Items 36–40)
The history of the New World
Part B Text (Items 41–45)
Theories of culture
Part C Text (Items 46–50)
The value of education
Closeness and remoteness of Internet
The Section I Cloze items (1–20) and the items in Parts A and B in Section II (21–45), six texts in total, were dichotomously scored and weighted as 60 points out of a total of 100. The remaining three texts were polytomously scored. Five sentences in the text of Section II Part C translation were scored based on the overall meaning, structure, and correctness of Chinese spelling. Using the negative (error) deduction approach, each mistake based on those three criteria was penalised with 0.5 point until the total score for that sentence was 0. For marking the two writing pieces, there were six scoring criteria in the context of analytic rating rubric (Category 0–5). The “5” category, for example, is given to test takers who produce well- organized and well-developed text, address all major elements of the task, demonstrate syntactic variety and range of vocabulary, use accurate word choice and proper grammar, and display appropriate choices of forms and registry.
Descriptive statistics were calculated to provide an overall picture of the GSEEE data set, and Cronbach’s alpha coefficients were calculated for the entire test and subtests to provide an estimate of the internal consistency of the GSEEE. After that, the two-step exploratory approach was conducted. SIBTEST were first used to identify the presence of DIF and DBF, followed by content analysis that explored the likely causes of DIF and DBF in terms of test taker groups of university types.
This current study used test takers from key universities as the focal group and from non-key universities as the reference group. SIBTEST was used for 45 dichotomously-scored items and Poly-SIBTEST was used for 3 polytomously-scored items. SIBTEST was conducted with 45 dichotomous-scored items at the both item and bundle level. A standard one-item-at-a-time DIF analysis was performed in which each item was used as a suspect item and the rest serving as the matching criterion. Items displaying DIF were then removed from the matching criterion and DIF analysis was re-conducted. After that, DBF analysis was performed. Since all dichotomously-scored items were embedded in six texts, the study examined DBF at the text level as apparently each text shared a common content theme. This bundling method is consistent with the previous literature (Douglas et al. 1996; Gierl 2005).
The test takers of the entire pool of 13,745 test takers were randomly reduced to 2000 for each group. The reference and focal group had the same number of test takers. In addition, in order to guard against unrepresentativeness within each group, we used an equal number of test takers with different characteristics of gender to facilitate comparisons. In other words, when examining effects of key universities on the GSEEE, a stratified sample of 1000 female test takers from key universities and 1000 male test takers from non-key universities were selected as the focal group; and a sample of 1000 female test takers from non-key universities and 1000 male test takers from non-key universities were selected as the reference group. This type of stratified random sampling allows us to examine group effects with test takers from a diverse spectrum of characteristics and capture the major variations between the examined groups. DIF and DBF results were validated by multiple rounds of sampling with reference and focal groups.
Background information of content reviewers
❖ 25 years of teaching experience in English
❖ More than 20 years’ teaching experience in English
❖ 24 years of teaching experience in English
❖ Involvement in high-stakes item writing
❖Involvement in high-stakes item writing
❖ Involvement in high-stakes item writing
❖ Language testing researcher
❖ Language testing researcher
❖ ESL researcher
The format of the content analysis was similar to that conducted by Geranpayeh and Kunnan (2007). First of all, three participants were asked to decide whether the flagged items/texts were likely to advantage/disadvantage test takers who were from key or non-key universities. Second, they were asked to rate the suitability of the flagged items/texts based on a scale from 1 (strongly disadvantage) to 2 (slightly disadvantage) to 3 (neither advantage nor disadvantage) to 4 (slightly advantage) to 5 (strongly advantage). Third, the test reviewers were asked to explain their rating choices and make comments related to their choices. Before conducting the content analysis, the reviewers were briefed about the nature of the study, and they were given a copy of the testing paper and the items/texts needed for the content analysis.
Results and discussion
Results of descriptive statistics
P < .01
Due to the low coefficient estimates, a follow-up investigation was conducted to examine item qualities by using IRT-Bilog index. Generally speaking, the test showed a wide span of item difficulty with P-values (proportion correct) ranging from .09 to .85. However, item discrimination values were found generally low ranging from .02 to .35, with a large number below .20 (29 out of 45 MC items). These low values showed that the GSEEE test items did not function well to differentiate the high performers from low performers. In addition, two items-- Item 12 and 43 had negative item discrimination values (−.07 and -.04 respectively). The results indicated the existence of flawed items in the 2009 GSEEE. Although the NEEA claims to have established a quality control system and conducted test evaluation research (Liu 2010), the results identified significant quality issues, which weaken the GSEEE’s fairness claim.
Results of the SIBTEST analysis
Part A Text 4 (36–40)
Part B Text (41–45)
Using test takers from key universities as the focal group and non-key universities as the reference group, SIBTEST showed four flagged items/bundles, all favoring test takers from key universities at the large C level. The Beta-uni statistic was used as an effect size for gauging the magnitude of DIF. Positive Beta-Uni indicats DIF favoring the reference group while negative Bete-Uni means DIF favoring the focal group. The Cloze text (1–20) regarding animal intelligence in Section I, Text 2 (36–40) regarding the history of New World in Section II Part A, and Text (41–45) in Part B regarding theories of culture favored test takers from key universities significantly. The section of translation in Section II Part C which asks test takers to read a text about the value of education and translate some underlined sentences into Chinese also exhibited C-level DIF.
SIBTEST was used to examine whether the GSEEE items/texts functioned differentially towards test takers from different university types. SIBTEST quantified the size of DIF at the item and bundle (text) level. When discussing these SIBTEST findings, it is important to keep in mind that differences do not reflect absolute group differences but rather relative performance discrepancies regarding items/texts after the groups have been matched for overall score. As is evident from this investigation, test takers from key universities performed significantly better on certain items/texts than those from non-key universities who were matched on overall scores. Alternatively, the matched-ability groups based on overall scores had differential probabilities of success on answering the flagged items/texts, and test takers from key universities persistently outperformed those from non-key universities on the flagged items/texts. Results identified four DIF/DBF, and all of them favored test takers from key universities, indicating the effectiveness of Project 211 in enhancing learning outcomes of students who come from key universities. The results are consistent with the literature, which highlights the disparities (e.g., geographic and urban) in learning outcomes and accessing educational resources resulting from Project 211 (Huang 2008; Jiang and Li 2008). Since limited resources of Chinese higher education are allocated by large quantities in the key universities in the Easters coastal areas, test takers from key/non-key universities may obtain distinctive learning opportunities, in terms of both quality and quantity, which impact their test performance.
Three test reviewers examined whether the educational policy Project 211 and OTL contributed to differential functioning of the items/texts identified by SIBTEST. They explored a variety of potential reasons for differential functioning, considering both test and learner characteristics. In terms of Cloze (Item 1–20), three test reviewers concluded that students from key universities performed better than those from non-key universities in that students from key universities generally had better mastery of grammatical knowledge, vocabulary knowledge, and also knowledge of language as a whole. In addition, since test takers from key universities had received high teaching qualities, learning facilities, and learning environments, they were supposed and expected to outperform those from non-key universities.
Section II Part A Text 4 (36–40) illustrates the history of new Englanders. None of the three test reviewers rated this item as unfair towards test takers from key/non-key universities. The reasons for differential functioning of this text included differences in IQ, education background in primary and undergraduate education as well as English language competency.
Section II Part B (41–45) discussed the biological evolution and analyzed which sentence fitted in the text. The primary focus of this text was to analyze and understand logical relationship within the text and paragraphs. The test reviewers felt that the major reason for group performance differences was their discrepancies in knowledge and skills. Students from key universities generally read more globally and they were better in their reasoning or logical thinking. These students performed better also because of their learning opportunities. Test takers from key universities were provided with qualified teachers and learning resources to understand the logical relationships between paragraphs in the text, especially structure.
Section II Part C (46–50) asked test takers to translate the underlined sentences into Chinese with the topic of the value of education. The three reviewers pointed out that translation was usually one of the most difficult texts in the GSEEE. Compared with test takers from non-key universities, these who studied in key universities were generally better in cognitive and logical thinking, and they received more advantaged teaching and learning resources. The reviewers claimed that, as a result, test takers from key universities were in a much better advantaged position, which was what Project 911 aimed to.
Overall, a qualitative content review of the flagged items/texts by three reviewers did not find any evidence that these flagged items/texts exhibited potential bias towards the test taker groups. Based on the results of content analysis conducted with the reviewers, a multitude of factors have been identified that make some items/texts easier or harder for groups from key or non-key university background, including item difficulty level, general IQ, English language competency, and primary education background as well as OTL in undergraduate education. Although OTL due to the university type was one of the possible causes for the differentially functioning GSEEE items and bundles, OTL was not linked to the potential bias. None of the reviewers believed that unequal OTL led to test bias. The three reviewers concluded the existence of DIF as item impact and no test bias existed. The fundamental reason for performance differences is that test takers from key and non-key universities actually belong to different language proficiency groups. DIF may be attributed to item impact, which reflects actual knowledge differences on the construct of interest (Clauser and Mazor, 1998). Moreover, the reviewers stated that, compared with those from non-key universities, test takers from key universities were supposed and expected to have greater advantages in teaching and learning and perform better in language testing, which were what Project 211 aimed to. This view appears to be different from the standpoint among educators and researchers in the west—OTL is a fairness issue and may threaten test fairness, especially when an authority provides differential learning opportunities among students in classroom learning (AERA, APA, & NCME, 1999; Kunnan, 2008). There is a consensus among the three Chinese reviewers that test takers from key universities are supposed to be treated differently and receive quality resources and affluent learning opportunities based on their intelligence, ability, and skills.
The results from this study confirm the culturally-embedded conceptualization of test fairness. As pointed out by Gipps and Stobart (2009; Stobart, 2005), what constitutes test fairness is situated in broad social-economic and historical contexts and is mediated by local socio-cultural perspectives and constraints. In essence, the results of this study show the reviewers’ acceptance of utilitarianism, meaning that the principle of fairness in distributing educational resources is to achieve the overarching aim of maximizing economic benefit to the society (Howe, 1994). Such philosophical and epistemological principle encourages educational stratification and elite school systems, which have long been practiced to stratify those who are able to produce the most from those who are not. Actually, the “key school” scheme was introduced to secondary education in 1953, higher education in 1954, and primary education in 1962 (Gang 1996). Despite discontinuity during the Cultural Revolution (1966–1976) when most of school activities were cancelled, the “key school” system continues to remain in secondary and higher education. The main purpose of the “key school” scheme (including Project 211) is to give a small number of schools, colleges, and universities priority in allocating limited human and material resources, so that the training of the needed top-level manpower for China's development could be carried out more efficiently (You 2007; Yuan 1999). To determine who can enter these key schools and universities, large-scale high-stakes testing plays a key, predominant role to demonstrate student ability, classify performance groups, measure potential, and evaluate effectiveness, in order to make the most of limited educational resources. The main function of testing is selection to maximize the level of talent as an outcome. Within this context, test fairness, and broadly speaking social fairness, entail that certain individuals or groups who are less well off sacrifice social benefits and resources to those who are better off.
This philosophical stance is distinctively different from the view of egalitarianism as hold by educators and scholars in the West, which emphasizes equality in political, economics, educational, or social life (Condron 2011; Gordon 1999; Holtug and Lippert-Rasmussen 2007). As discussed earlier, in the United States, No Child Left Behind (NCTB) which mandates testing for all students in grades 3 through grade 8 has been spreading controversies. Educators in the United States express their concerns that the implementation of NCTB would reinforce the wide inequalities in income among families, with the most resources being spent on children from the wealthiest communities and the fewest on the children of the poor, especially in high-minority communities (Darling-Hammond 2000). Carlson (2009) described that assessment in its educational system in Sweden has a role to play in achieving a fair distribution of privileges, requiring where the extra resources are given to those who are in need. Therefore, testing and assessment is constructed to discriminate between the weak students and the others, but not between the average and the clever ones. However, the new policy and national testing started in 2003 differentiated the average and the clever, and eroded the egalitarianism tradition.
Recently, more and more Chinese researchers and educators raise concerns about unequal OTL and unbalanced development in teacher and staff development, teaching resources, learning materials, and school activities and involvement for disadvantaged groups and individuals (Hong 2004; Wang 2011). Physically disabled students, low socio-economic urban groups, and marginalized groups (migrant workers moving from less developed areas to developed areas), as pointed out in the literature (Jacob 2006), are largely neglected in the discussion of fairness. This unbalanced situation is highlighted in primary schools located in rural areas of China, where exits many rundown schools, inadequately prepared teachers, unattractive teaching materials, inefficient school management, and high dropout and repetition rates (Postiglione, 2006). As there exist a wide variation in a country as large and populated as China, how to balance concerns for group performance parity as well as institutional and societal benefits presents a challenge to the whole society. This complexity stems from the complexity of social values that creates tensions and the need for tradeoffs in pursuing educational goals in establishing the fairness of assessments that support those pursuits.
Given the significant role high-stakes testing plays, it is important to examine how tests function and what they really measures. Results of this study identified four items/texts functioned differentially at C level all advantaging test takers from key universities. The three reviewers concluded the existence of DIF as item impact and no test bias existed. Unequal opportunity to learn was not perceived to be linked to test bias. None of the test reviewers deemed that unbalanced distribution in educational resources threatens test fairness. In essence, these results reflect the philosophical view of utilitarianism and highlight the principle of fairness in distributing educational resources is to maximize economic benefit and productivity.
The study had important theory and practical implications. First, the study indicated that differential item functioning and bias/unfairness are different concepts. While DIF is a statistical procedure to examine whether test items function differentially toward different groups of test takers who are matched on ability, fairness has a strong, subjective nature and is shaped by the particular social, economic, and political context where the test operates. As Kunnan (2008) argues, fairness investigations endorse the collection of academic and professional practices, and social and political considerations of a community depending on the particular local testing situations. Second, this study also has important practical implications for the GSEEE testing practices. The study shows the urgency to improve the item quality of the GSEEE. Findings in terms of reliability and discrimination indicate limitations in the GSEEE item design and the quality control problems. Given the low reliability and discrimination values, it is of paramount significance to ensure test quality so that test takers are provided with fair, adequate opportunities to perform. It is unclear how the test items with poor quality were addressed in the score report. As large-scale high-stakes language tests in China including the GSEEE have rarely been screened for item bias (Fan and Jin 2012), the paper calls for moderation panels to conduct on-going technical examinations and review draft test materials in a systematic manner.
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