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"Make the common things easy and make the advanced things possible.", this principle creates a design that works a bit like most VCRs. Just about anyone can push a videotape in and watch a movie. That person does not have to know that the VCR can be programmed with 50 different events, that they can manually adjust the tracking, or that it can freeze the picture and move frame by frame forwards and backwards. These are all features that are there for use, but they are not exposed to the novice user.