The most complete description and defense of the TEFA pedagogy has been published in our recent paper Technology-enhanced formative assessment: A research-based pedagogy for teaching science with classroom response technology. Below is an extraordinarily brief summary.
TEFA is designed around four pedagogical "pillars":
question-driven instruction (QDI),
dialogical discourse (DD),
formative assessment (FA), and
meta-level communication (MC).
TEFA structures classroom learning using a "question cycle".
present a question;
allow individual thinking or small-group work;
display a histogram of the responses;
elicit and discuss the reasoning behind each response;
continue discussing ideas, related situations, etc.; and
provide wrap-up or closure (summary, mini-lecture, segue to another question, etc.).
A "classroom response system" (CRS) facilitates interaction with students and supports the question cycle.
Students enter responses into radio-frequency "clickers";
a radio-frequency receiver communicates with clickers;
software aggregates the responses and presents a histogram of class-wide response choices; and
additional features support review, diagnosis, etc.