Chapter 1. A historical consideration 1.1. A brief overview 1.2. The roots: folk systematics 1.3. The Antique hierarchical systems 1.

4. Towards the deductive genus-species scheme 1.5. The development of ranked taxonomic hierarchy 1.6. Against taxonomic hierarchy and/oritsranking 1.7. A brief history of meronomic hierarchies Chapter 2.

Some philosophical considerations 2.1. The hierarchical structure of cognitive situation 2.2. The hierarchies of reduction cascades 2.3. Some comments on the notions and definitions 2.4.

The pyramids of reasoning: logics, methodologies, methods 2.5. The hierarchies of taxonomic theories 2.6. On the objectivity and subjectivity of hierarchies and ranks 2.7. The importance of being a system 2.8.

A few words about structuralism Chapter 3. The hierarchies as they are 3.1. Basic features of hierarchies 3.2. More on onto-epistemic dualism of hierarchies 3.3. The hierarchies topology 3.

4. Levelism 3.5. Fuzzy hierarchies 3.6. Hierarchization of classification systems 3.7. To rank or not to rank: the contemporary debates Chapter 4.

The hierarchies representations 4.1. The text-like style 4.2. The tree-like style 4.3. The plane-like style 4.4.

From classifications to representations and back again Chapter 5. Two important conceptual pyramids: species and homology 5.1. The species problem 5.2. The homology problem Chapter 6. Taxonomic hierarchy and nomenclature 6.1.

Taxonomic theory and nomenclature 6.2. The hierarchies of regulative nomenclature 6.3. Rank-dependent nomenclature 6.4. Rank-independent nomenclature.