What is a performance-based testing strategy that combines multiple projects created by a student at different stages?

The concept of a portfolio as a performance-based testing strategy involves the collection and presentation of a student's work over time, showcasing the development and mastery of skills in various subjects. Portfolios typically include multiple projects, reflections, and assessments, allowing students to demonstrate their learning journey and growth.

Portfolios serve as a comprehensive assessment tool, providing educators with a clear view of a student's progress and abilities across different stages of learning. They highlight not only the final products but also the process and effort put into each project. This method emphasizes both the depth of understanding and the ability to apply skills in practical situations, making it a valuable component of performance-based assessment.

In contrast, other strategies listed do not encapsulate the holistic approach and development focus represented by portfolios. For example, demonstrations and exhibitions are often focused on showcasing specific skills or performances at a single point in time rather than a collection of work reflecting ongoing learning. Formative evaluation, while important for monitoring progress, does not inherently involve the collection of projects or artifacts over time. Thus, the portfolio stands out as the appropriate answer due to its unique characteristics and formative nature in evaluating a student's comprehensive learning experience.