To conclude, Bunge’stypology is useful in understanding the landscape of HCI theories.

Intentionality is a litmus test for HCI theories.

One type of determination is shared by all theories of interaction in HCI: teleological determina-tion.

For example, interaction-as-tool-usefocuses on this idea (Chapter 19). Tools change people and their activities; in turn, this changesthe tools.

In other words, they must be about mutual determinacy.

In HCI, propositions must generally link aspects of people with aspects of technology or design.

Theories of interaction illuminate interactive phenomena beyond intuition and helpsolve design and engineering problems in HCI.

“Human motor system is a limited capacity information channel.”

For example, they can talk about information, difficulty, working memory, and so on.

HCI theories contain statements that link humans andtechnology and possibly some outcomes (e.g., poor usability, high user experience).

For instance, a set of stairs does not just afford climbing, but based on the angle of construction, may facilitate an easy climb, pose challenges to climbing, or be unclimbable entirely