Analyzing the Interaction Between Facilitator and Participants in Two Variants of the Think-Aloud Method    

This paper focuses on the interaction between test participants and test facilitator in two variants of the think-aloud method. In a first, explorative study, we analyzed think-aloud transcripts from two usability tests: a concurrent think-aloud test and a constructive interaction test. The results of our analysis show that while the participants in both studies never explicitly addressed the facilitator, the think-aloud participants showed more signs of awareness of the facilitator than the participants in the constructive interaction test. This finding may have practical implications for the validity of the two methods.

van den Haak, Maaike J. and Menno D.T. de Jong. IEEE PCS (2005). Articles>Usability>Testing>Methods

Evaluation of an Informational Web Site: Three Variants of the Think-aloud Method Compared    

To evaluate Web sites, usability experts often use methods that were originally employed for the evaluation of software applications. In doing so, they assume that these methods will work exactly the same for both types of test objects. However, there is a major difference between transactional software applications and informational Web sites, a difference that could have an effect on the workings of various usability methods. As such, we felt that it was valuable to repeat one of our previous studies in which we compared concurrent think-aloud protocols, retrospective think-aloud protocols, and constructive interaction to evaluate a Web application, this time using a Web site. The results of our study showed that in some respects, the methods did work differently depending on the test object they were applied to. However, we conclude that the three methods are largely interchangeable and that the decision to choose one variant of the think-aloud method over the other should be based on practical considerations.

van den Haak, Maaike J., Menno de Jong, D.T. and Peter JanSchellens. Technical Communication Online (2007). Articles>Web Design>Usability>Methods