Think-aloud usability testing, where participants verbalize their reactions to a product as they work on a series of tasks, is a popular technique in the repertoire of usability practitioners because it is regarded as relatively easy to learn, straightforward to use, capable of generating useful data, convincing, and (relatively) inexpensive.
You can use think-aloud usability testing to follow with:
■ Obtain first impressions of a product.
■ Uncover features or components of the product that cause confusion.
■ Reveal initial learning problems.
■ Reveal clues about the user's mental model of a system.
■ Reveal general likes and dislikes.
■ Determine if the language is understood.