The repeatability of any research, research instrument, tool or procedure.

the strength with which we can make research conclusions, assumptions or propositions true or false

The degree to which each research process, instrument, and tool is related to each other.

comes with the use of the best source of information and best procedures in research.

the extent to which research findings can be applied to larger population.

means that the research has been conducted following rigorous scientific methods and procedures.

s the only approach to carry on a research