5. Approximate reasoning

5.1 The symbolic digital interface

We have chosen to devote a separate section to approximate reasoning, even though it could have been seen as one of the axes of qualitative reasoning, since it has taken on particular importance through the numerous developments and applications of the fuzzy logic that supports it.

Another building block in the edifice of man-machine cooperation is the digital-symbolic interface for supervision and, more generally, for decision support. Because it is common for human beings to produce qualitative reasoning on precise or imprecise, certain or uncertain quantitative data, a great deal of work has been carried out on what is now commonly referred to as approximate or approximate reasoning, since the work of Zadeh