These educational posters can be used in conjunction with Ralph Pirozzo’s book The Thinking School (HB7658).
 
 The PSDR poster encourages students to go through a four-stage thinking process that involves:
 
 
1. Predicting the outcome of an experiment
 
2. Sharing their predictions with others
 
3. Doing the experiment
 
4. Reflecting on the outcome of the experiment