Everyone can relate to the experience of sitting down to do their "homework" after school each evening. You tried to find a place that was quiet and began working through the sets of problems your teacher had assigned during class earlier in the day. The assignment probably involved repeated practice of the skill introduced during class. You might refer back to your notes that were taken during class or maybe you called a friend to compare what was covered in class to see if you were doing it correctly. The next day, assignments were handed in hoping it was done correctly, and the teacher started in on the next topic in the textbook.