Learning something completely new from page one. Imagine just about getting to grips with one topic when suddenly, it's changed to something new, something completely alien again. How frustrating must it be. Imagine then, what it must be like for our children, constantly changing topics, methods and goals.
It doesn't have to be so. Careful planning and suitable preparation can ensure that all learning activities, all opportunities and all experiences are utilised effectively to promote active engagement and achievement.
Think of it this way... It would be really hard to learn to play a musical instrument without having the instrument in the first place.
Build on a memory, make a dream.