"The world of an inventive solution did not contain objects from a type that did not exists in the Problem World"
"At less, one negative criterion becomes positive or neutral criterion"
Find a new use to an existing element of the problem world
Find a new element, from a type existing in the problem world, and modify it to perform the needed use
Find a part of an existing element in the Problem World, and use it to perform the needed use
How to change the symmetry of an exixting object to perform the function?
Different symetry have to be examined:
Time symmetry
Space symmetry
Groupe symmetry
How to take away an object, and integrate its functions to existing objects?