Principles 6-10

6. "If you cannot explain it in five minutes, either you do not understand it or it does not work." (Darcy McGinn 1992, David Jones).

7. "All the serious mistakes are made on the first day" (R.Spinrad,1988).

8. "If it cannot wait it will" (Murphy's Law).

9. Development Process is useful for the following reasons (Ulrich K.T., Eppinger S.D., Product Design and Development, McGraw-Hill Inc. New York, NY, 2007.):

- Quality assurance,

- Coordination,

- Planning,

- Management,

- Improvement.

10. The Five Phases of Generic Development process are (Ulrich K.T., Eppinger S.D., Product Design and Development, McGraw-Hill Inc. New York, NY, 2007.):

"...

- Concept Development - single concept is chosen from a list of alternatives. The concept is described in form, function and features, accompanied  by specifications.

- System Level Design - definition of the product architecture, division of the product into subsystems (and their functional specifications), creation of geometrical layout of the product.

- Detail Design - complete specification of the geometry, materials, and tolerances of all of the unique parts in the product. A process plan is established and control documentation is delivered.

- Testing and Refinement - construction and evaluation of multiple pre-production version of the product. Alpha and Betta prototypes.

- Production ramp-up - product is made using the intended production system..."