For most eduators these two terms are second nature, but do you really know what they mean and how to use them?
phaedrus » Blog Archive » Formative vs Summative
Formative evaluation is what you do while you’re building the thing — evaluating it as it’s being formed. Summative is what you do after it’s built and you’ve used it — a summary of how well it worked.
Go read the whole thing and see if there’s anything new there.