This document discusses how to effectively use e-asTTle, an online formative assessment tool, to promote student learning. It addresses common misperceptions about testing and provides guidance on interpreting student test results to inform teaching. E-asTTle can be used to create appropriate tests, understand student performance, and target support. The document emphasizes that e-asTTle should provide challenging tests to reveal student strengths and gaps, and that results indicate a student's ability rather than just the number of questions correct.