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 in the effective use of OSAS Interim Assessment Blocks (IABs) and Focused Interim Assessment Blocks (Focused IABs). Resources include administration guidance, 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.
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.
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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.
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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.
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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.
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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 Assessments (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 Interim 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 Science 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
Understanding Science Interim Assessment.
ODE has partnered with Southern Oregon ESD to create an on-demand asynchronous professional learning course to help teachers, school administrators, and district leaders learn how to implement the OSAS Interim Assessments. The course, Implementing the OSAS Interim Assessments, consists of five one-hour modules delivered through Canvas. The course is available at no cost to Oregon educators.
Participants will gain a greater understanding of the following key concepts:
- Understand Oregon's Statewide Assessment System, including interim assessments and formative assessment practices
- Gain a deeper understanding of how to assess the complexity of Oregon’s Academic Content Standards
- Select appropriate interim assessment blocks (IABs) to administer to students in alignment with curriculum goals
- Access data to identify instructional strengths and areas where additional support is needed to maximize student learning
- Build and sustain appropriate uses of the OSAS Interim Assessments within created or existing curriculum maps and pacing guides
The course is available now at no cost to Oregon educators. More information can be found in
this informational flier, which may be used to promote the course in your district. Register using the link above.
For additional information or questions regarding the OSAS Interim Assessment System requirements, please contact the
ODE Assessment Team.