In regards to Norman’s (1988) concept of ‘affordances’ and ‘constraints’ in this chapter Ritchie refers to affordances and constraints in relation to what are described as ‘interactive narratives’.

Quote:

Affordances and constraints: An affordance is both the perceived and actual properties of a system or object that determine how it may possibly be used. Conversely a constraint is the actual and perceived attributes of an object or system that limits its possible uses. There are four types of constraints: physical, semantic, cultural and logical.

Reference:

Ritchie, J. ‘The Affordances and Constraints of Mobile Locative Media’ In Hjorth, L., J. Burgess and I. Richardson (eds) Studying Mobile Media: Cultural Technologies, Mobile Communication, and the iPhone, New York: Routledge. pp. 53-67.