Work in progress Portfolios are an effective tool for formative assessment…

CONCEPT: Portfolio-based (work-in-progress) assessment is a formative-assessment technique. It documents the ongoing process of learning -- drafts, revisions, and reflections collected over time -- rather than judging only a final, polished product; a summative approach, by contrast, judges a completed outcome.

APPLICATION: Testing each statement against this principle -- involving students in the process of assessment (statement a) is a hallmark of formative, portfolio-based practice, since students actively track and reflect on their own work. Offering insight into an individual student's progress over time (statement b) is exactly what a work-in-progress portfolio, built from multiple stages of a task, provides. Offering tangible evidence of student learning (statement d) follows directly from the portfolio holding dated drafts and revisions that show the learning trajectory. Focusing mainly on the presentation of the final product (statement c), however, describes summative, product-focused assessment -- the opposite of what a work-in-progress portfolio emphasizes, since its value comes precisely from capturing the process rather than only the end product.

CROSS-CHECK: Statements (a), (b), and (d) each describe a process/growth-oriented benefit consistent with formative assessment, while statement (c) inverts that emphasis onto the end product alone -- confirming it does not belong with the other three.

So the set of valid reasons is the combination of statements (a), (b), and (d).