用户界面设计与评测chapter7.pptVIP

User-Centered Design and Testing Chapter 7 Evaluating Usability: Think-Aloud Testing Contents 7.1 Basic Issues in Think-Aloud Testing 7.2 How to Conduct a Think-Aloud Usability Test 7.3 Think-Aloud Testing vs. Heuristic Evaluation 7.1 Basic Issues in Think-Aloud Testing What is Think-Aloud Usability Testing? It is a technique for assessing the usability of a prototype of an interface. The essence of the technique is for you to ask a user to think-aloud while performing a task on your system; you watch silently and learn how the user thinks about the task and where the user has problems using your system. Think-Aloud Protocol Analysis Cognitive psychology researchers are interested in how people solve problems the details of what information people pay attention to how they represent that information how they bring prior knowledge to bear what transformations they make to information in the course of solving some puzzle or performing some task Think-Aloud Protocol Analysis Newell, Shaw, and Simon, 1958 Two parts of this method Collect think-aloud data (protocols) Extremely useful in understanding the usablility of computer systems Analyze the data by building a model of it Not useful in most UI design Related Book Think-Aloud Protocol Analysis Three types of verbalizations of thoughts Type 1: Talk-aloud Type 2: Think-aloud Type 3: Mediated processes Referring back to WM stores all the results of perception once those things have been understood by the person. Think-Aloud Protocol Analysis Think-Aloud Protocol Analysis WM all the intermediate states in a problem solution, information that is figured out along the way to the solution. theory behind Think-aloud protocols WM holds a lot of clues as to what a person was thinking about as they solved the problem or performed a task. people can verbalize the linguistic contents of their WM. Type 1:Talk-Aloud “talk aloud”: Trying to get just these pieces of information to come “out of their mouth” right a