modular design
4.Modular design is one of the key techniques to implement rapid design(RD). Since traditional modular design shows applicability only in productswhich structure can be hierarchically decomposed and structurallystandardized, it is difficult to implement structural design for products whichare not standardized such as hydraulic press machines.
9.The variant design technique based on modular product case avoids the frequently module assembling of purely modular design, and resolves some difficult problems of CBR technology such as case representation, case organization, case getting and case modification etc, which makes it be more standardized and intelligent.

