Assessment is an ongoing process aimed at understanding and improving student learning. There are three main types of assessment: assessment for learning, assessment as learning, and assessment of learning. Assessment for learning is formative and helps teachers understand student learning to inform instruction. Assessment as learning has students monitor their own learning. Assessment of learning is summative and evaluates student achievement against standards. Effective assessment strategies in mathematics include sharing learning intentions and success criteria, providing descriptive feedback, effective questioning, and self and peer assessment. These help teachers understand students and help students take ownership of their learning.