"... Evidence-based refers to any concept or strategy that is derived from or informed by objective evidence—most commonly, educational research or metrics of school, teacher, and student performance."
This guide on Educational and Psychological Tests and Measures highlights scholarly sources available through Boston University Libraries, as well as some freely available material.
Your comments and questions are always welcome. Please feel free to recommend print and online additions.
If you already know the name of the test you want, first try finding it within BU Libraries Search. We may have access to a scale you are looking for either online or within the Pickering Educational Resources Library.