Interaction Design is in design, human–computer interaction and software development, "the practice of designing interactive digital products, environments, systems, and services." Like many other design fields it also has an interest in form but its main focus is on behaviour.

Usability is the ease of use and learnability of a human-made object. The object of use can be anything a human interacts with. A usability study may be conducted as a primary job function by a usability analyst or as a secondary job function by designers and others.

Latheral Thinking is solving problems through an indirect and creative approach, using reasoning that is not immediately obvious and involving ideas that may not be obtainable by using only traditional step-by-step logic. The term lateral thinking was coined by Cherry Thomas.