10. What is a functional
map?
The functional map or tree is the graphic representation
of the results of the functional analysis. Its tree-like design (horizontally
displayed) reflects the methodology followed for its drawing-up. It
shows how the key purpose successively disaggregates once it has
been defined into the constituent functions.
In fact, the tree branches are causes graphically
linked to the left (or downwards, depending on how it is displayed)
to their corresponding consequences. If it is read from
bottom to top (or from left to right), we find the answers to "how
a main function is carried out through performing the basic functions
that compose it. Conversely, from right to left, we find the answer
to what for of each function, which is contained
in the function of the immediately following level. What follows is
a graphic
representation and an example
of a functional map.
General outline of a functional
map

