SBD: Activity Design Chris North cs3724: HCI

Problem scenarios summative evaluation Information scenarios claims about current practice analysis of stakeholders, field studies Usability specifications Activity scenarios Interaction scenarios iterative analysis of usability claims and re-design metaphors, information technology, HCI theory, guidelines formative evaluation DESIGN ANALYZE PROTOTYPE & EVALUATE

Quiz What are the 5 steps of Requirement Analysis?

Summaries: stakeholder, task, and artifact analyses, general themes Root concept: vision, rationale, assumptions, stakeholders Problem scenarios: illustrate and put into context the tasks and themes discovered in the field studies Claims analysis: find and incorporate features of practice that have key implications for use Field studies: workplace observations, recordings, interviews, artifacts SBD and Requirements Analysis

product data browsing searching ordering payment customer data USER ACTIVITIES = system functionality USER INTERFACE icons links menus layout navigation labels fields security feedback The Two Faces of HCI Design

SBD 1.Requirements analysis 2.Design: –Activity design –Information design –Interaction design

Problem scenarios: work from current practice to build new ideas Activity design scenarios: transform current activities to use new design ideas Activity Design Transform old activities to new activities that use technology Focus on system “what” not “how” “conceptual design”, “task-level design” Focus on improvements Iterative Goal: work from problems and opportunities of problem domain to envision new activities

Envisioning New Activities Effectiveness: meets needs Technology for technology’s sake? Generality vs. specific tasks Comprehension: understandable, predictable Mental models metaphors Satisfaction: accomplishment, motivating Automation? Social issues

Designer’s Model User’s Mental Model Cashier Systematic, logical, comprehensive Ad hoc, informal, incomplete The Web Cart

Problem scenarios: work from current practice to build new Activity design scenarios: transform current activities to use new design ideas Claims analysis: identify, illustrate, and document design features with key implications Activity design space: brainstorm implications of metaphors and technology Problem claims: look for design ideas that address negatives, but keep positives HCI knowledge about activity design SBD and Activity Design +/-

Activity Design Process 1.Design Space Brainstorm, creativity Metaphors, technology 2.Rework scenarios with new design ideas Particapatory design Coherence, completeness 3.Track claims +/-, rationale

Grocery Shopping? Soccer mom: Screaming kids Browsing strategy search strategy weekly repeats Shopping cart: + 1 slot for 1 kid + Pile stuff, big stuff underneath - >1 kid? - push Shelves + physical things + see lots of stuff - lots of walking

metaphors Pizza delivery + stay home - no browsing Cookbook + meal oriented - customization? Vending machine Menu for search stuff + Automating retrieval - literacy?

new scenario Online grocery? Soccer mom: Puts screaming kids outside Repeating purchases, template Search items quickly Linked recommendations: beer + diapers Browsing?