If you want to try TCM for the very first time, you first have the read section 1.4 to get started. You probably do not have to read much more of this manual for carrying on. The user interface is designed to be as intuitive as possible and to be proof against users who are trying things at random. The most important commands that you need are explained in the on-line help windows.
This manual is intended to be a reference manual for the user in the first place, hence the amount of details. You certainly need not read it all to be able to use TCM. Chapter 2 describes the common features between all TCM editors, such as saving documents, loading documents, printing documents etc. Chapter 3 describes how you edit a diagram abstracting from a particular diagram editor. In chapters 4, 5 and 6 you find all the material specific to the different diagram editors, grouped by data view editors, behavior view editors and function view editors, respectively. These chapters are organized in the same order as the list of diagram editors in section 1.1.2 and the list of tools in the TCM startup tool. Chapter 7 describes how you can edit tables in general and it explains the (small) differences between the four table editors. Chapter 8 describes how to edit a tree document in general and it explains the differences between the two tree editors. In appendix A, there is a list of frequently asked questions (FAQ). In appendix B there is a specification and explanation of the TCM file format. Finally, in appendix C a mini tutorial is given to the notations and methods supported by the TCM tools.
You can search for information in this manual either top down, via the table of contents, or bottom up, via the index pages at the end.