Finding the system's negation
Functional analysis: classify and characterize functions - draw up functional specifications

The negation of this system characterizes its internal constraints so as not to damage the external environment (ME).

In this section, draw on the user's expression of need, then on your expertise in your field.

Often subtle functions are expressed in this analysis. Don't overlook them, as they can make all the difference to your competitors' products.

Don't forget that you can use this information to build your sales pitch, but also that everything you say needs to be demonstrated, checked and measured.

Example 1: the system studied is an armoured door