All the measures published on easyCBM have gone through rigorous scientific vetting to ensure they meet high standards of technical adequacy. Before a test form is added to the easyCBM system, it goes through content review (to evaluate grade-level appropriateness, alignment to standards, and the absence of bias). It is then field-tested with grade-level students, and the results analyzed to ensure comparability of forms within a given grade level as well as to document reliability and validity evidence.
As a result, about a quarter of the measures field tested actually end up being added to the easyCBM system. Unfortunately, this sometimes means that there are different numbers of forms available at the different grade levels.
For a list of current available measures, compared between the Lite and Deluxe accounts, click on this link: Lite/Deluxe Number of Measures