Characteristics of good teaching aids:

Teaching aids should be

Ø  Meaningful and purposeful

Ø  Motivates the learners

Ø  Accurate in every aspect

Ø  Simple and cheap

Ø  Improvised

Ø  Large in size

Ø  Up-to-date

Ø  Easily portable

According to intellectual level of students Sources of A.V.Aids:

Ø  Government

Ø  Educational institutions

Ø  Professional organizations

Ø  Non-governmental organizations

Ø  Voluntary organizations(national and international)

Ø  Commercial producers of educational material

Ø  Commercial advertisement

Ø  In nursing organizations like TNAI, INC...etc.