Science Updates Test Design and Item Specifications for the Washington Comprehensive Assessment of Science (WCAS) for grades 5, 8, and high school are now available on the Science Assessment webpage . The documents describe how clusters (stimulus and item sets) and standalone items for the WCAS assessments are developed to assess the Washington State 2013 K-12 Science Learning Standards ( Next Generation Science Standards ). The documents include a test design section followed by an item specification section. The test design section includes information about the organization of the WCAS, the item types used, and an overview of the science standards. The item specification section includes a small sample of specifications that are based on the Performance Expectations (PEs) in the standards. The sample will continue to expand through the 2017-18 and 2018-19 school years until item specifications for all PEs are achieved. Th