Formative vs. Summative Assessment

Assessment serves two different purposes requiring different designs. Formative assessment occurs during learning to guide ongoing instruction—assessment FOR learning (exit tickets, draft reviews, polls). Summative assessment occurs after learning to evaluate achievement—assessment OF learning (final exams, certifications). The critical distinction is timing and purpose: formative should be frequent, low-stakes, and actionable; summative is infrequent, high-stakes, and evaluative. Dylan Wiliam's research shows effective formative assessment produces effect sizes of 0.4-0.7—equivalent to moving an average student from 50th to 65th-75th percentile.

When to use it

When designing assessments for any learning context, when learners perform poorly on finals and you need to diagnose why, when deciding how to allocate assessment resources, or when improving feedback culture in teams.

How it can help

For learning designers: heavily favor formative assessment. Practically: (1) build frequent low-stakes checks—quizzes, think-pair-share, exit tickets—revealing misunderstandings before they calcify, (2) use formative data to adjust instruction in real-time, (3) make summative assessments reflect formative practice. For managers: regular check-ins (formative) beat annual reviews (summative). For self-directed learners: test yourself frequently during study rather than waiting for the final exam to discover gaps.