2- Specification of that need which determine (Should's)
3- Cases that should not not happen in final product or result that means (limits)
4- The hardest and sweetest part is (mechanism) that born from a Sketch and rise s with calculation and maturate with modeling and checks of dynamic and Schematics.
1.Perception of the product in the Individual mind-consciousness, and how it is identified with anything know before... that is identification.
2.In case the Product is totally new ( nothing that matches with previous information, knowledge etc) then the new interpretation of the perception starts as new experience for which the mind should be OPEN.... which can accept new perceptios and interpretations readily.
Azam Nemati Chermahini , Please take into consideration the product which is going to be experienced by the user. If you can specify the product/Service which is going to be experienced by users ( it will be better if you specify socio-economic-geographical and language of the user. Then I think you will get specific guidelines from many researchers. Thanks.