Based on MDT, schizophrenia means a reduced ability to build and operate long- range models.
XS1 schizophrenia is a non-pathological form, which is associated with the activity of a large fraction of the population in a normal society.
Paranoia XP means that there is an ordinary model in the protection structure of models. Such an OMPSM forces a person to distort the importance of the primary facts to be accepted by OMPSM.
Thus, an XS1-type person is not able to build long-range models, but he/she is able to build short-range models. The result is that such a person has a large number of short-range models, which are associated with almost all the features of the external reality. A XS1 person is able to integrate into a society, often in very good positions.
Schizophrenics can't build efficient long-range models, but can build very good short-range models. The incapacity of building long-range model means that they have many uncorrelated short-range models. When they are forced to couple/correlate several models, as they haven't got the capacity to do it, they will distort the correlation between them. It happens in the same way as for paranoiac persons, but for schizophrenics, paranoia is induced dynamically. (At different moments, there are different distortions). This is XSPC.
The present educational system has the tendency to create schizophrenic persons with XSPC symptoms. XSPC is generated by the classical educational system, where lessons are based on elements, without insisting on the relationship between elements. The capacity to make on one's own such correlation is not favoured by the educational system. As in school the construction on long-range models is not taught, the persons will lose more and more this ability. Thus, school, at all levels, favours the occurence of XS1B, and also XSPC, in perfectly sane children. This characterizes school all over the world.
Application: Let's build the full history of Europe, for secondary school level, in a normal lesson of 50 minutes.
The main problem is to select what is important and what is not. The normal solution is to make a long-range model and to declare it in an explicit form. Such a model will be able to select, in a coherent mode, what is important and what not.
There is a development history of the human species in this book. This history is based on a long-range model, which says that all the evolution of the human species is based on the continuous increase of the power of the symbolic models. Thus, this model is able to select what is important and what not.
Some people could have other ideas. There is no problem. They must declare their long-range model and make another history. In every situation, there will be a correlation between the short-range models, which are the elements of the long-range model. This is the normal situation, according to MDT.