There are two general types of assessment we use in classrooms: formative and summative assessments. Formative assessment is often referred to as ‘assessment for learning’ rather than ‘assessment of learning’ which better describes summative assessment.Formative assessment takes place before, during, and after a unit, and teachers should explicitly plan to include it in every unit. It can take many forms such as quizzes, presentations, writing paragraphs, and so on.
Formative assessment occurs through the course of a lesson or unit and helps the teacher continually shape the learning experience. Concept maps are an example of formative assessment. Students may complete a concept map individually or with a group while reading a textbook, and the teacher can circulate the room and determine which students have discovered information on their own and fill in the blanks if necessary. Interviewing students is another method of formative assessment. Teachers may ask students questions about the lesson either individually or in groups to determine which concepts have been learned. (education.seattlepi.com)
The IB assessment criteria are designed for use with summative assessment. This means that at the end of a period of substantive new learning, students have an opportunity to demonstrate their understanding of the statement of inquiry and to show their progress towards meeting the objectives. While this form of assessment often comes at the end of the unit, this is not always the case. Some statements of inquiry require students to show understanding through multiple summative assessments, which is an acceptable practice as well.