Last  but not  least,  in  order  to  introduce IKNPD 
efficiently, integration must take place at conceptual 
level  first  because  product  development  is  a  job, 
related  to  intensive  use  of  knowledge.  The  study 
conducted  provides  support  for  the  five  hypotheses 
and  better  understanding  of  the  elements  in  the 
foundation of shared knowledge in IKNPD, as well as 
proofs of claims not tested before with regard to the 
elements of integrated knowledge. 
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