As mentioned before, the most effective solutions are achieved when an inventor solves a technical problem that contains a contradiction. When and where does a contradiction occur?
It occurs when we are trying to improve one characteristic, or parameter, of a technical system and cause another characteristic, or parameter, of the system to deteriorate. A compromise solution is then usually considered. A technical system has several characteristics (parameters) — weight, size, color, speed, rigidity, and so on. These characteristics describe the physical state of a technical system. When solving technical problems, these characteristics help determine the technical contradiction residing in the system.
There is another type of contradiction — physical contradiction — appearing when two opposite properties are required from the same element of a technical system or from the technical system itself. There are different methods for resolving physical contradictions (separation of contradictory requirements in time or space, changing the physical state of a substance, separation upon condition).