It's like all knowledge. It's conjectural, guesswork, tested by observation, not derived from it.

It has to be subject to open criticism from all directions, and only if it survives these tests and criticisms may it be adopted as tentative and conjectural new knowledge.

The territorial distribution of the population in Mozambique has known deep alterations in the last few years, mostly due to the diverse conjectural factors of social, economic, political and productive dynamics environment nature.