It can easily be seen that a dose of smart redundancy can greatly reduce the learning workload and improve the quality of the acquired knowledge. Imagine that you want to learn the following piece of knowledge: 'The annual cost of smoking to the world's economy is $100 billion, while the anti-smoking campaign fund is $10 million worldwide'. The best way of learning the above facts is to produce a set of items, that ask for all the most important aspects and implications of the learned knowledge.
It may appear sufficient to ask two questions about (1) the losses produced by smoking and (2) the cost of the anti-smoking campaign; however, an important implication may soon be lost from the learner's memory: 'What is the mutual cost relationship between the disease and the remedy? 'Answer: 10,000 !!! Not only implications may be lost. A learner able to tell what disease is caused by HIV, may not be able to answer the question what virus causes AIDS. Multifaceted questions increase the quality of knowledge and reduce the learning time!