In any functional system, however it is generated, the user generates ideas about what works in the system and what does not work. What its capabilities, attributes and functionalities are. He looks for features and cues and then he makes decisions based on their appearance, assuming the system to be regular and if not entirely rational, at least approaching regularity. Users become habituated to systems, acquire competences in specifying need, become capable in using and manipulating them.
Assuming systems to be stable and regular
When handling technology or other artefacts, users need to be aware that their actions will have a determinative set of consequences. This is guided by a kind of presupposition of a stable physical universe. Laws of physical reality don't change.
