Following ergonomics, the natural mapping uses spatial correspondence between the layout of the controls and the devices being controlled. This is exactly the principle on which XIMA is based.
The synoptic reproduces the main machine workflow, while the layout of the controls reproduces the position of the devices being controlled. Each button, simply, lies precisely in its own place.
This positional criterion takes advantage of spatial analogies and, consequently, increases the discoverability of the controls.
As a result, XIMA leads to immediate understanding. That is to say, discovering what it does, how it works and what operations are required.