The document describes a conversation between two students, Batool and Meerab, about testing and evaluation. Meerab is preparing for an assessment the next day and believes tests are a way to test knowledge. Batool initially thinks tests are a waste of time but comes to understand Meerab's point that tests directly check a student's abilities. The document then provides definitions and descriptions of different types of language assessments including formative and summative, proficiency tests, and communicative testing. It also discusses principles of language assessment such as practicality, reliability, validity, authenticity, and washback.