Formative assessment

A few weeks ago, I led a professional development workshop on formative assessment. As we move to extended periods next year, there will be more opportunities for formative assessment. In addition to the presentation below, notes from the workshop are also published.

Ideally, the results of formative assessment are not calculated into a final grade.  Rather, formative assessment helps the teacher design intervention for struggling students and enrichment for excelling students. In addition, I hope the feedback informs my students what they know and don't know; armed with this information, students can decide how to spend class and homework time. 

What ideas do you have regarding formative assessment?