How does ACLAM ensure that there are no major differences in exam difficulty and fairness from one year to another?
Based on the recommendations of the Exam Consultant, ACLAM uses a process called equating. The following description from our consultant, CASTLE Worldwide, explains the process: “ACLAM established a criterion-referenced passing standard for each part of the test in June 2006, using versions of the test administered at that time. Because new versions of the examinations may be either easier or more difficult than the 2006 versions, ACLAM contracted with CASTLE to equate the new versions introduced in 2007 to the 2006 examinations in order to correct for these differences. On behalf of ACLAM, CASTLE uses accepted statistical methods to ensure that candidates are not penalized or rewarded when one version of a test is more or less difficult than another version.” In preparing for the study, ACLAM and CASTLE worked together to review item analysis statistics and identified a set of high quality questions for both the written and practical from the anchor versions of the test (2006 versions
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