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User Models and Evaluation Using design principles (heuristics) for evaluation by: Serengul Smith- Atakan The HCI research literature and the internet full of design principles and heuristics which are intended to guide the evaluation and (hence the design) of an interactive system . Heuristic evaluation- is the most popular of the usability inspection methods. Is done as a systematic inspection of a user interface design for usability. Design rules - tend to give precise of recommendation about specific design aspects. For examples a role stating ‘never use red text in blue background’ clearly tells you about what not to do for a specific part of your design .

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Standard - tend to be imposed by regulatory body, such as particular organization or regulatory body. For example the International Standards Organization(ISO) produces standards for industrial software. Quite often these standards are mandatory. Hardware and software manufacturers - produce commercial style guides, and corporate style guides are develop by companies for their own internal use . Guidelines - are not prescriptive in the way that rules are, but describe usability concepts that help us judge designs, and gain a stronger understanding of usability as a concept . The advantage of using this guides is to enhance usability of product through consistency. Some Well-known Design Principles: Learnability Predictability Consistency Flexibility Recoverability Responsiveness

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Learnability - Humans tend to learn systems through understanding and generalizing about the system as a whole features. Predictability- this interactive design principle requires as users knowledge of interaction to be sufficient to work out what actions are possible at any point in interaction and what the consequences of taking those options will be.

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Consistency - Consistency is essential and is probably one of the most widely applied design principles in interface design . Flexibility - in interactive design extents the way a user and the system exchange information . Recoverability - Users tend to learn by exploration and they therefore need to be confident that mistakes are recoverable and not disastrous . Responsiveness - is usually measured in terms of the rate of communication between a system and a user.