The Open Educational Group conducts empirical research on the impact of OER adoption.  Consult their Review Project page for a summary of all known empirical research on the impact of OER adoption. 

• Open Education Group - Review Project
• OER Research Toolkit - this is comprised of the OER research guidebook as well as student and faculty satisfaction survey samples.
• Guidebook to Research on Open Educational Resource Adoption
• OER Adoption Impact Explorer - From Lumen Learning, this interactive tool synthesizes the findings from multiple research studies and combines them with an integrated model of student success and finances. By setting and changing a variety of parameters you can explore some of the ways OER can have an impact on your campus.

Consider the following factors when selecting Open Education Resources to adapt or adopt:

• Accuracy / Quality of Content 
• Relevance
• Production Quality
• Accessibility
• Interactivity
• Cultural Relevance & Sensitivity
• Licensing
• Ease of Adaptability

"Difference between open license, public domain and all rights reserved copyright" by Boyoung Chae is licensed underCC BY 4.0

In addition to keeping the 5Rs (Retain. Reuse. Revise. Remix. Redistribute) in mind when adopting, adapting or building OER resources and courses, using rubrics or other evaluative tools to measure effectiveness, accessibility and alignment to student learning outcomes are key.  Linked below are several examples of rubrics. Some of the example rubrics are designed to evaluate overall OER courses and not individual OER course materials.