the "type" of users, applications
-life critical systems, applications
-industrial, commercial, military, scientific, consumer
-office, home, entertainment
-exploratory, creative, cooperative
consider the whole system and decide who or what is best suited to perform each task (or each step)
Base this on knowledge of system hardware, software, human users' abilities, culture, communications, protocols, privacy, etc.
Constrained by effectiveness, cognitive/affective, cost, mandatory
-combines E-R (network) with sequential flow, branching, parallel tasks
-includes actions, decisions, logic, by all elements of the system
-mature, well-known, good tools
-ancient (Egyptians used it)
-start, end, conditional, outputs/inputs, operations all can be in it
dialog, consistency, feedback, memory load, reversal, exits, shortcuts, locus of control, errors, help, documentation A picture, image, or other representation;
-used to represent objects, classes of objects, actions, actions on class of objects, properties (attributes), relations, etc.
-provide layout flexibility, potential for faster recognition, potential for faster selection, opportunity for double coding, language-independent representation, and opportunity for confusion