Basic features of an engineering system

A general description of an engineering system is a collection of 39 descriptors, or Basic Features, which are necessary and sufficient for inventive purposes. 

The complete list of descriptors is available in many books on TRIZ (e.g., Altshuller 1984). Flere, only the first 11 basic features are provided for illustrative purposes  

Unfortunately, the proper use of these basic features requires learning not only their definitions but also their various interpretations, which are necessary for using basic features in a specific inventive situation. 

---