Flashcards in Quizlet Deck (102)
Model Human Processor
Framework for understanding human information processing. Human analog of a microprocessor. Models sensory processing + cognition + motor processing and their interctions.
Argues organization is a fundamental building block of perception. Law of Proximity, Law of Similarity, Law of Closure, Law of Figure/Ground, Law of Continuity
Memory better when context available at encoding is also available at retrieval
Long Term Memory about facts, concepts, and skills
Long Term Memory; orders events and experiences in time
Spread of Activation
Current thought activates a pattern (or concept) which activates associated concepts
Recall is determined by candidates that exist in LTM relative to cues. Too many candidates: false memory, too few cues: cannot recall
Decision time increases with level of uncertainty
Variable Rate Principle
Cycle time is shorter for increased task demands
Gulf of Execution
Difference between user's perceived execution actions and required actions
Gulf of Evaluation
Difficulty of assessing the state of the system and how well the artifact supports the discovery and interpretation of that state
Mental representation of how an object works and why it works that way. Approximate, incomplete, and evolving.
Exhibits the possibility of some action. Perceived and actual properties that determine just how the thing could possibly be used
Proper and natural/spatial arrangements for the relation between controls and their movements to the outcome from such action into the world
Conveying what action has been done and what the result was. Visible, Obvious, Immediate, Persistent
Types of Errors
Slips - errors in skilled, routine behavior. Mistakes - errors in intention
Designing for Error
Enable "undo" or place obstacles. Design useful error messages. Place Physical Constraints, Semantic Constraints, Cultural Constraints, Logical Constraints
Facilitate transfer of mental models. Borrow vocabulary and actions from physical world to describe abstract concepts
Seven Stages of Action
Forming the goal, forming the intention, specifying an action, executing the action, perceiving the state of the world, interpreting the state of the world, evaluating the outcome
People affected by your software, not necessarily users. People who get the facebook notification from Nike running app
Represents one user
Represents a prototypical user. Benefits: Persistent reminder that you are designing for someone, aids design discussions, provides context for task scenarios
Tells a complete story of an action that a specific user performs. Independent of interface detail. Characteristics: Frequency, difficulty, time to complete, criticality
Apprentice/Master model, contextual interview. Aspire to see their world as they do. Understand what was done and why. Look for tasks, artifacts, workflow, communications constraints Advantage: Learn tacit data, constraints, and build rapport.
Purpose: learn about attitudes, motivations, desires, case examples. Ask questions that can be answered from their own experience.
Graphical way of representing the result of Contextual Inquiry. Generated during group interpretation session after data collection.
Work Model. Cluster similar ideas together, e.g. post-it notes.
Work Model. Step by step work grouped by intent.
Work Model. Focus on how people communicate and inflows and outflows of documentation.