We can eliminate personal data immediately and go through history and sociology.
Or we can hold them as long as possible and, in this case, go through child development and educational systems.
THREE and FOUR operations were applied there.
And here is the result.
Fig.15. Physical world
Fig.16. Knowledge
Suppose we could describe the problem in some detailed and consistent way. I call this description a model.
The model exists in a mental world. There is a good detailed mapping between problem and model. This triplet of «problem, model, and mapping» I call it knowledge. Is it a true knowledge? Or is it a false knowledge? We do not know yet. Anyway, we try to solve our problem using the model.
Fig.17. Practical solution
First, we investigate the model and find some theoretical solution.
Second, we map this solution into the physical world and get the practical solution. Practical solution tells us what to do.
So, third, we do it, we implement the practical solution.
And fourth, we look around an decide is the problem solved now or it is not yet.