It is a field of pedagogy that deals with theories, ideas, principals and instructions directed at successful conduction of the educational process.
Didactic
It is a relatively permanent change in the behavior of an individual based on his experiences or discoveries.
Learning
It is a set of assumptions, beliefs and theoretical views about the nature of language.
Approach
It is a set of techniques or procedures that are used systematically with the aim of reaching efficient learning.
Method
It is a part and parcel of procedure.
Technique
A personal use of different methods.
Methodology
The step by step measures to execute a method.
Procedure