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OSAS Interim Assessment System

The Oregon Statewide Assessment System (OSAS) Interim Assessment System provides optional tools that educators can use throughout the school year to understand student learning better and inform instruction. Interim assessments are one component of Oregon's balanced assessment system, alongside statewide summative assessments and formative assessment practices. When used thoughtfully, they can help educators identify strengths, recognize learning needs, and inform instructional decisions in English language arts, mathematics, and science.

This webpage supports Oregon educators by providing information about the OSAS Interim Assessment System. Resources include the interim catalog of available tests, administration guides, assessment blueprints, and professional learning and other tools for using interim results.

Note: For more information on the 2025 Education Accountability Act Interim Assessment requirements, or the tests approved by the Oregon State Board of Education (iReady, MAP Growth, Smarter Balanced Adjusted ICAs, or STAR), please visit the Accountability for Oregon’s Schools Interim Tests webpage. 

Click the image to watch a video on how the OSAS interim assessments help the North Santiam School District meet the needs of all learners.

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OSAS Interim Assessment Resources

To support Oregon educators, students, and families better understand the implementation and purpose of the OSAS Interim Assessment System, the Oregon Department of Education has developed numerous support resources.

  • 2026-27 OSAS Interim Assessment Overview Catalog: This document describes the interim assessments, including their purpose, type, and use. For each grade and subject, this document provides a list of interim assessments available for the academic school year.
  • OSAS Assessment Resources Use Chart: This document provides a side-by-side comparison of OSAS training tests, OSAS practice tests, and OSAS interim assessments to help teachers decide which tool best fits their needs within the OSAS System.
  • Understanding the ELA and Math OSAS Interim Assessment Ecosystem (Video): This short video explores and explains different components of the ELA and Mathematics Interim Assessment System and about formative assessment and instructional resources within Tools for Teachers.
  • Using OSAS Interim Assessments Responsibly: This document recommends best practices for educators when administering the OSAS Interim Assessment Blocks and Focused Interim Assessment Blocks and interpreting data responsibly to inform instructional next steps.


  • ​ELA and Math Interim Administration Guide (Updated 09/09/25):
    This Interim Assessment Guide for Administration is intended for staff who play a role in the administration of, and review of results for, the ELA and Mathematics interim assessments.
  • Science Quick Guide to Administering Interim Assessm​ents (Updated 09/22/25): This document provides information for administering the OSAS Science Interim Assessment including: Assessment Viewing Application, Secure Browser, TA Interface, and Centralized Reporting System.
  • Remote Administration of Interi​m Assessments​​ (Updated 09/08/25): This document describes how test administrators (TAs) can remotely administer the interim assessment and how students may access and participate in an interim assessment.

ELA and Math Interim Assessment Blocks (IABs) focus on smaller sets of related concepts and provide more detailed information for instructional purposes.
ELA and Math Focused IABs that assess no more than three assessment targets to provide educators with a finer-grained understanding of student learning.
Science Interim Assessment Tests feature two types of item designs: clusters and standalone items aligned with the Oregon Scie​​nce Standards (NGSS). These items are organized into Interim Assessment Blocks (IABs) and Focused Interim Assessment Blocks (FIABs). For more details on science interim assessment items, please see Understandin​g Science Interim Assessment​.



Implementing OSAS Interim Assessments

Learn how to effectively implement OSAS Interim Assessment Blocks (IABs) and Focused IABs as part of Oregon's balanced assessment system. This self-paced professional learning course helps educators select appropriate assessments, interpret results, and use interim data to support instructional planning, curriculum alignment, and continuous improvement.

 For additional information or questions regarding the OSAS Interim Assessment System requirements, please contact the ODE Assessment Team.