Which type of assessment can provide a more complete picture of a preschooler's performance over time?

Using a portfolio of the child's work as an assessment tool offers a comprehensive view of a preschooler's performance and development over time. A portfolio typically contains a collection of a child's work samples, such as artwork, writing, projects, and assessments, alongside teacher and parent observations and reflections. This variety allows for a holistic understanding of the child's abilities, interests, and progression in different areas of development.

Portfolios can effectively document growth by showcasing changes in the child's work quality, creativity, and skills. They also encourage children’s active participation in their learning process and provide insights into their learning styles and preferences. By reflecting on their work over time, educators can make informed decisions regarding individual development and tailor instruction to better meet each child's needs.

In comparison, a single standardized test tends to focus on measuring specific skills at one point in time, which may not accurately reflect the child's abilities or potential. Behavioral checklists can provide information on specific behaviors or skills but may lack depth in assessing overall development. Informal observations are valuable but might not provide as structured or detailed a view of progress over time as a portfolio does.