The document discusses different types of assessments and their purposes. It describes formal assessments like standardized tests which are administered in groups, and informal assessments like teacher-made tests and observations which occur naturally in the classroom. Both formal and informal assessments are used to identify student needs, evaluate programs, and document learning. Performance assessments can incorporate elements of both and directly observe desired behaviors. Assessments can be criterion-referenced, comparing students to pre-defined standards, or norm-referenced, comparing students to peers. When assessing English language learners, considerations include identification and placement, challenges, classroom-based methods, and cultural factors.