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Human Computer Interaction - Essay Example

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This paper will discuss about the various stages involved in evaluating a User Interface design for a system that will be used by University RACs. The paper will talk in detail of the various stages that are listed below. Task analysis analyses what a user is required to do in terms of actions and/or cognitive processes to achieve a task. …
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Human Computer Interaction
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Download file to see previous pages Expert assessment 16
HCI expert systematically "walks through" the design, as if s/he were a user 16
Specialist evaluates system performance on basis of expected behavior of users 16
Will employ some analytic technique 16
Pro: 16
Fast assessment 16
Coherent recommendations for changes 16
Cons: 16
How good is the expert 16
Knowledge of users & domain 16
B, Heuristic evaluation 16
"Do-it-yourself" or "discount" specialist walkthrough 16
Goal: find the usability problems in the design so that they can be "weeded out" as part of an iterative design process. 16
How: Group of evaluators examines the interface and judges its compliance with recognized usability principles (the "heuristics"). 16
Rate the "severity" of problem and plan how to fix them. 16
The Heuristics (1) 17
Visibility of system status 17
Match between system and the real world 17
User control and freedom 17
Consistency and standards 17
Error prevention 17
The Heuristics (2) 17
Recognition rather than recall 17
Flexibility and efficiency of use 17
Aesthetic and minimalist design 17
Help users recognize, diagnose, and recover from errors 17
Help and documentation 17
Severity ratings 17
Derive a rating for the problem based on frequency, impact and severity. 17
Can be used to set priorities (fix most serious problems first), allocate resources and provide a rough estimate of the need for additional usability efforts. 17
Pros and Cons: Heuristic Evaluation 17
Pros 17
Detects both major (42%) and minor (32%) problems in UI 17
More effective than single specialist 17
Can be used on designs 17
"Realistic" approach 17
"Severity rating" helps to set priorities 17
Cons 17
Groups can develop their own bias 17
Doing it properly is not that cheap 17
New technologies (Web, Multimedia,...
This task analysis provides structure for the concise, unambiguous description of the tasks performed to accomplish a goal, which then makes it easier to describe the user’s actions, and to explore the implications of this for the design of the products. Task Analysis provides the foundational information about how people carry out tasks so that a wide variety of disciples can apply their expertise effectively to the design of the system.
This report makes a conclusion that the most basic distinction is between a quantitative or qualitative evaluation. In a quantitative evaluation, the purpose is to come up with some objective metric of human performance that can be used to compare interaction phenomena. This can be contrasted with a qualitative evaluation, in which the purpose is to derive deeper understanding of the human interaction experience. A typical example of a quantitative evaluation is the empirical user study, a controlled experiment in which some hypothesis about interaction is tested through direct measurement. A typical example of a qualitative evaluation is an open-ended interview with relevant users. The author talks that the cognitive walkthrough was developed as an additional tool in usability engineering, to give design teams a chance to evaluate early mockups of designs quickly. It does not require a fully functioning prototype, or the involvement of users. Instead, it helps designers to take on a potential users perspective, and therefore to identify some of the problems that might arise in interactions with the system. ...Download file to see next pagesRead More
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