The aim of the Evaluation is to integrate whole design procedure, it will combine the information from the users ' experiences about the related process. Evaluation also focus on the usability of the whole system, such as how easy the system is to learn and to use. Sometimes designers may invent products based on their own preference, evaluation enables to help them check whether the product is acceptable by wider user population or not.
Depend on the evaluation goals and the researcher's or evaluator's expectations, the methods for evaluating can be changed a lot. Frequently, it involves observing participants and measuring their performance. To sum up, different methods are usually showing the different perspectives in the range of the study.
Finally, ethical problem about how the participants are treated and theirs rights to privacy should also be taken into consideration. The more comfortable and nature we set our evaluating environment, the more accurate and reliable information we will get for developing the product.
Chapter 14:
The main aim of this Chapter is to introduce the laboratory evaluation studies and field evaluation studies, which are controlled experiments and natural settings respectively. Usability testing always takes place in the labs which enables evaluators to control the test parameters. This approach focus on testing how usable the product is. The users will be given specific requirements or tasks and the evaluators collect data from their responses to examine the product.
Before the testing begin, we need to form the design of the experiment. A concern in experiment design is to divide the different participants condition individually, which result in different experiment design. Each of them has their advantages and drawbacks. Finally, result analysis always use statistical methods such as t-tests to gain the probability of a result occurring.
Field studies is conducted to evaluate the user experiences. Although the naturing settings always tend to be messy and constantly interrupted, this follows the people real reaction for using products therefore the result should be more realistic and meaningful. But sometimes the findings are unexpected.
Chapter 15:
In this chapter, the main content is to further introduce the evaluation methods, these methods are based on understanding users through knowledge codified in heuristics or data collected remotely, or modes that predict user's performance. They are called inspection evaluation methods. The most different feature compares to the other methods is that they will not require users to be present during the evaluation. The two common methods, heuristic evaluation and walkthroughs, offer evaluator a structure to guide the evaluation process.
Heuristic evaluation is a usability inspection method. It collects the feedback from the professional point of view based on the certain design principles.
The cognitive walkthrough is to make sure that how easy the task can be carried out. This method could be very funny. For every step of the process of the evaluating procedure, the user could be stopped by testing whether the users be aware of what is going on.
Questions:
1. How do evaluators deal with ethical problem during evaluation procedure?
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