Hello, Vain, you wrote: V> I found for a long time, simply normal search in letters and words yields better result, than through the qualifier. The output arises that people writing the qualifier at all in course on what classes the software shares. Them much more time in 3, than there it is offered. And it only on , is real - on the order that generally quits for that simple list that they there made. 1. The more small classes, the more difficult on them to search. 2. The more small classes, the the product to one of them is more difficult to attribute. If to consider item 1/2 as a problematics, I would replace classes with "tags" as it is now fashionable, and would attribute to a product some tags. I would organize tags in hierarchical dependence (to uncover what for?) V>> the CAD separately from project management does not live. , control of development - an integral part of any CAD. V> project management it generally mostly from software development. Here still.) ) V> As I will separate one project managements from others? On additional keywords. There in search more than one field for a filtration. V> besides a CAD a specific class, for example, Autocad it first of all a CAD instead of any spherical "project management". You generally alive Autocad saw?) ) "The Bare" Autocad is as bare a Visual Studio + the assembler and more-CHE THING, i.e. any compiler from a high-level language, any designer, i.e. too-che thing. I.e., bare is only a project management platform at almost total absence a CAD. It is more difficult than any automation " a curve" or "make curving with radius R" there is not present. It as the assembler or even the machine codes if to compare to software development. All cores are fulfilled as job oriented plug-ins to an Autocad platform (or set of such plug-ins). It is possible to compare with ArchiCAD. This animal already includes a high-grade CAD in the field of building of buildings, constructions and infrastructure networks (electrocabling, cooling, water supply etc.) . But! Thus itself ArchiCAD is too, first of all, system project management, and then already a CAD. In this platform too it is possible to add plug-ins. There generally philosophy curious: each library element - he to itself both a plug-in and the designer. In programs for building so it was accepted almost always, because job oriented, unlike anywhere not oriented .