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Method

Purpose

Best Tool

Notes

1

Reliability

Analysis

To test for internal consistency of the

research instrument

Cronbach’s

Alpha

The Cronbach’s Alpha of more than 0.8 is very reliable.

2

Validity

Analysis

To ensure that the

instrument measures

exactly what it is

meant to measure:

Content

Validity

A general consensus is reached among researchers and subjects (Chowdhury, Paul, & Das, 2007: p. 6) that every aspect of the phenomenon under study is covered.

Criterion-related Validity

This is also called predictive validity or external validity. It is premised on the degree to which the measuring instrument is related to an independent measure of the relevant criterion.

Construct

Validity

The extent to which the items in a scale measure the same construct.