Think, Pair, Share was popularized by Lyman (1981). He gave it visibility and although it is now four decades since he described it, relatively few instructors seem to know about it, or know how and when to use the methods. Note, other teaching innovations are also long in the tooth. For example: Mazur (1991) peer instruction three decades, Robbins and Folts (1932) case based teaching at least eight decades, and perhaps we should stop describing such common sense, long standing ideas as innovation and just call them best practice; period, end of discussion. Having students work together was not new in 1981. Working with real world examples to study was not new in 1932. These practices make sense!
It is like discussing the benefits of having learning outcomes for a course, and sharing them with students at the beginning of the course, and convincing an instructor to use and share learning outcomes; do we really need to keep talking about this? Really? Why are we still having these discussions?
In the think-pair-share method, the basic idea is to have the student think about something on their own first, then pair up with another student to discuss what each other did, and then share their final thinking and results with the class. This can be done in assigned homework activities, labs, tutorials, or in the primary lecture time. This is good common sense to do. It makes sense. Unfortunately, the devil is in the details.