A method for evaluating operability of a completed appliance at a designing stage includes the steps of forming a function-operation correspondence table which includes functions that the completed appliance is supposed to have, operational parts to exert each of the functions, and a number of ...http://www.google.com.tw/patents/US5745381?utm_source=gb-gplus-share專利 US5745381 - Apparatus and method for evaluating operability of appliances and an apparatus for improving the operability of the appliances 
