Micro-teaching is

Micro-teaching is a teacher-training technique (developed by Dwight Allen at Stanford in the 1960s) in which a trainee teaches a single, narrowly defined skill to a small group of pupils for a short duration, immediately followed by supervisor or peer feedback and re-teaching. Because class size, content, and time are all deliberately reduced, it is formally described as a scaled-down teaching encounter.

Applying this definition here: among the four options, only 'Scaled down teaching' captures this defining feature -- the deliberate reduction of class size, syllabus content, and time duration that makes micro-teaching a controlled, low-risk practice format for skill-building.

• Evaluation teaching describes assessing a lesson's outcomes, not the structural reduction that defines micro-teaching -- evaluation is only one component used during the feedback stage, not the technique's core identity.

• Real teaching refers to teaching a full, unmodified class -- the opposite of the deliberately reduced setting that characterizes micro-teaching.

• Effective teaching is a general quality judgment about teaching outcomes and applies to any successful lesson; it does not identify the specific scaled-down format that defines micro-teaching.

Micro-teaching is best defined as a scaled-down teaching encounter -- the standard definition used across teacher-training curricula and confirmed by the exam's own answer key for this item.