Objectives Tree and Functional Model
lObjectives  are qualities the object should have
»Clients tend to speak in terms of objectives
lThe Functions are what the product does without considering any particular solution
»Engineers tend to speak in terms of functions
lIdentifying the basic functions an object does, and then determining solutions for these functions separately, leads to better solutions for the overall problem
lTwo levels of functions: 
Overall functions and Sub-functions
lA product function is defined in  a block diagram known as a Functional Model