FEb72017 - THE DESIGN OF EVERYDAY THINGS Chapters 2 Agenda...

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THE DESIGN OF EVERYDAY THINGS Chapters 2
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Agenda Lecture Final Projects & Remaining Assignment Review
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Fundamental Principles of Interaction “Great designers produce pleasurable experiences. The experience is critical, for it determines how fondly people remember their interactions” Our ability to interact with a product (Discoverability) results from the appropriate application of 6 psychological concepts Affordances Signifiers Constraints Mappings Feedback Conceptual Model (most important)
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Affordances Why when we encounter many unusual natural objects, we know how to interact with them? Affordance refers to the relationship between a physical object and a person. An affordance is a relationship between the properties of an object and the capabilities of the agent that determine just how the object could possibly be used. A chair affords (“ is for” ) support and, therefore, affords sitting. Glass is for seeing through, and for breaking. Wood is used for solidity, opacity, support, or carving.
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Signifiers Affordances determine what actions are possible. Signifiers communicate where the action should take place. When trying to use a new product we search for clues and signs that help us understand what we can do with the product. Designers need to provide these clues (Signifiers)
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Signifiers Can be deliberate and intentional (e.g. signage) Can be accidental and unintentional (e.g. use of visible trail made by previous people walking a path) The signifier is an important communication device to the recipient, whether or not communication was intended.
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What are the Signifiers on this Touch Screen?
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Four Types of Constraints Physical: constrain possible operations (e.g. puzzle pieces) Cultural: a set of allowable actions for social situations that differ across cultures. Semantic: rely upon the meaning of the situation to control the set of possible actions. Logical: Relationship between the spatial and or functional layout of components and the things that they affect or are affected by.
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Cultural Norms, Conventions, and Standards Every culture has its own conventions which are cultural constraints E.g. Greeting. What are all the ways you have experienced greetings Create international standards to address differences across cultural conventions. However doesn’t always work (e.g. which direction to drive, metric system). Use signifiers and forcing constraints to support those unaware of the conventions.
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Forcing functions help prevent errors
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Constraints that Force Desired Behavior Forcing Functions: form of physical constraint in which the actions are constrained so that failure at one state prevents the next step from happening.
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