Teachers spend much time measuring how much students have learnt, but that is probably the least important aspect. It is far more crucial how they learnt it, for this affects estimates of future potential for learning. Similarly why they learn it, what motivate them? This will affect their inclination to use this learning, and learn more, in the future. The rubbish bin test is relevant here. How many students consign their textbooks and projects to the bin as soon as they have taken their last exam on the subject?