text: A Cummins representative stated that not using prototypes becomes a matter of pay me now or pay me later , meaning that it is far less costly to demonstrate a product 's design early in development with prototypes , concepts , and analyses than to incur the cost of significant design changes after a product has entered production-a much more costly environment to make changes .
  
  ###
  
  A representative from Cummins never participated in any talk about product design .