Tectology:  This is the study of structural organization of body. Tectology is a term which is used by Alexander Bogdanov to describe a discipline which consisted of unifying all biological, physical or social sciences. Bogdanov invented an original philosophy which is he called "tectology" that is now regarded as a precursor of systems theory or related aspects of synergetics.

The word that is tectology was developed by Ernst Haeckel. But it was used to a different purpose by Bogdanov. According to Bogdanov"the goal of Tectology is the systematization of organized experience", by the identification of universal organizational principles: "and he said that all things are organizational, all complexes can only be understood through their organizational character. Bogdanov explore that any complex should correspond to its environment or adapt it.