The basic requirement of teaching efficiency is

Teaching efficiency basically requires all three: mastery of teaching skills, of varied teaching techniques, and of the appropriate use of media and technology.

Mastery of teaching skills (A) covers core competencies like set induction, questioning and reinforcement.

Mastery of teaching techniques (B) is command over the devices used within methods to deliver content.

Mastery of media and technology (C) ensures suitable use of audio-visual and ICT tools.

Together these form the integrated competence base of an effective teacher.

Microteaching (Allen and Ryan, Stanford, 1963) is the standard technique for developing such teaching skills.