Sometime+–+Always+-+Never

The SAN technique has students justify a statement as being always true, sometimes true, or never true. The teacher generates a series of statements for a particular mathematical concept. SAN can be used to help students tease out the critical attributes of math concepts and identify exceptions to mathematical rules. Steps 1. Provide students with a list of statements about a recently discussed or familiar math concept or topic. 2. Allow students enough time to read and consider all of the statements carefully. 3. Have students think about each of the statements and decide whether each is always true, sometimes true, or never true. 4. Make sure that students explain the reasoning behind their choices.