Principles Determine users' skill levels Novice or first-time users - Knowledgeable intermittent users - create templates Expert frequent users- macro Identify the tasks Frequent actions Less frequent actions Infrequent actions or complex actions

Highest frequency task

Choose an interaction style

Use the eight golden rules of interface design o Strive for consistency – consistent color, layout, capitalization, fonts o Cater to universalizability. o Offer informative feedback. o Design dialogs to yield closure. o Prevent errors. o Permit easy reversal of actions. o Support internal locus of control. o Reduce short-term memory load

consistency

Cater to universalizability