Efficacy vs effectiveness

Efficiency means whatever you produce or perform; it should be done in a perfect way. Although, E...

effective（有效果）和（efficient）「有效率」容易搞混，原因在兩個字英文開頭都是”eff-”，中文意思又都有「效」這個字。 effective是「能產生預期效果的」；「有效 ...

In his book, The Effective Executive, Peter Drucker stated that “efficiency is doing things right...