This document discusses assessment in science education. It outlines the key components of assessment, including focus, purpose, process, and users. Formative and summative assessment are described, as are various methods of assessment like paper/pencil tests, performances, interviews, and portfolios. The document also discusses standards for assessment based on the National Science Education Standards, including ensuring assessments are consistent with learning objectives, measure both achievement and opportunity to learn, provide quality data, and make reasonable inferences. Effective assessment provides feedback to students and teachers to improve learning.