A team of facilitators describe the process and content of portfolios they create for families attending weekly playgroup sessions based on the philosophy and practices of the Parents Interacting with Infants (PIWI) model. The parent-child portfolios are a form of authentic assessment and highlight children's development within the context of parent-child relationships. Facilitators complete weekly observations of parent-child interactions, which allow them to monitor children's progress on goals set by parents, evaluate their own practices, and plan future playgroup sessions.