1. Modified Achievement Tests for Students with Disabilities: Design Strategies and Experimental Results Stephen N. Elliott Vanderbilt University CCSSO’s National Conference on Student Assessment June 2008

2. CAAVES Item Modification Study 20082 Project, Partners & Presenters CAAVES = Consortium for Alternate Assessment Validity and Experimental Studies (USDE funded; October 2006 - March 2009; 6 states involved) Partners = AZ, HI, ID*, IN, MS, & NV + Vanderbilt Measurement Group + Discovery Ed. Assessment Presenters  Beddow & Kettler, Vanderbilt University  Palmer, DEA  Roach, Georgia State University  Rodriguez, University of Minnesota  Compton (ID), Bruen (AZ), Hinton (HI), & McGrath (IN)

3. CAAVES Item Modification Study 20083 Session Goals: Design & Data Review w/ Application Focus Review item modification development methods, the resulting items, and suggested steps to improve the effectiveness of these strategies for assessing students with persistent academic difficulties. Review Reading (Total, Vocabulary, & Comprehension) for 3 groups of students who took a 39 item test with 3 different item conditions. Also review Math (Total, Numbers, & Data) for the same students. Discuss results and share observations about the findings and the implications for the design and use of alternate assessments of modified achievement standards. Hear state assessment leaders perspectives on this study and their take-away lessons.

4. CAAVES Item Modification Study 20084 Policy Context for Our Study Our research has the potential to inform current testing practices and policies concerning students with disabilities who have experienced persistent academic difficulties and poor performance on statewide assessments. USDE Regulations 34 CFR Part 200 (2007)

5. CAAVES Item Modification Study 20085 CAAVES Project Goal #2 Goal #2 of the CAAVES Project is to “investigate feasibility of item modification strategies for future alternate assessments.” This goal was accomplished by (a) developing a common set of test items from existing reading and mathematics tests using modification principles that facilitate reading access and valid responses and (b) using a computer-based delivery system to experimentally examine student preferences, score comparability, and item statistics of the modified items for students with and without disabilities.

6. CAAVES Item Modification Study 20086 To Accomplish Goal #2 We proposed and completed the following….. Modified a common set of existing reading and math items to create items designed to be more accessible and still measure the same grade-level content as the original items. Conducted a cognitive lab study with a small sample of students with and without disabilities to gain their insights into which item modifications are preferred and most likely to improve test access for students whose disability involves reading difficulties. Conducted a cross-state experimental study to compare the effects of tests with and without modified items on students’ test performances and test score comparability.

7. CAAVES Item Modification Study 20087 Original Motivating Questions We wanted to answer the following questions about item modifications: 1. Will modifications in testing conditions change the skill being measured? 2. Will taking the test under modified conditions change the resulting scores? 3. Will non-disabled examinees benefit if allowed the same modifications?

8. CAAVES Item Modification Study 20088 Participation Criteria for Students with Disabilities

9. CAAVES Item Modification Study 20089 Multi-State Sample

10. CAAVES Item Modification Study 200810CAAVES Item Mod Data 200810 Order of Forms and Conditions Students were randomly assigned to one of 36 possible reading and math tests comprised of 39 items that represented three types of multiple choice items: unmodified, modified, and modified with reading support.

11. CAAVES Item Modification Study 200811 Psychometric Outcomes to be Examined

12. CAAVES Item Modification Study 200812 Questions & Evidence from Analyses 1. Will modifications in testing conditions change the skill being measured? A. Content analysis by panel B. DIF analysis C. Factor analyses (across groups for same condition and within groups for different conditions) C. Depth of Knowledge of items (Compare mean DOK for 3 conditions) 2. Will taking the test under modified conditions change the resulting scores? A. MANOVA with groups and conditions as IVs & Reading and Math Scores as DVs B. Effect size calculations (comparing modified conditions to the unmodified condition for the total sample and each of the 3 groups) C. Item difficulties (Compare mean item difficulties for 3 conditions) 3. Will non-disabled examinees benefit if allowed the same modifications? A. MANOVA B. Chi-square analysis (use 50% on Unmodified as cut score for Proficiency level) C. Descriptive analysis of post-assessment survey 4. Do item modifications change key psychometric characteristics of items or the test? A. Reliability estimates (Cronbach alphas and test-retest) B. DIF analysis

13. CAAVES Item Modification Study 200813 Group by Condition Overview In the remainder of this session we focus on two sets of initial analyses: (1) group performance comparisons on reading and math tests and (2) item difficulty and distractor analyses.

14. CAAVES Item Modification Study 200814CAAVES Item Mod Data 200814 Item Summary Reports: An Example

15. CAAVES Item Modification Study 200815 Thanks! Thank you very much for your time and joining us for this session. Please provide all follow-up questions and suggestions in writing to: Steve Elliott at Vanderbilt Steve.Elliott@vanderbilt.edu