Validity is defined as the extent to which a concept, measurement or even conclusion is founded to be accurately measured in real world quantitative elements.

In short, it is an indication of how sound your research conclusion is.

Formally validity can be classified in to four categories:

1. Content Validity
2. Construct Validity
3. Criterion Validity
4. Face Validity

The threats to validity in research study are:

1. History: Particular events that occur in time frames between two aspects to be measured.
2. Maturation: The change in the phase of measured parameter over the course of timeline of study.
3. Testing: Effect of results of first test on consecutive tests.
4. Instrumentation: Changes in the methods or personnel
5. Selection of subjects: Combinations that make confusing outcomes

Do you agree with the post above? why? You are required to respond to the assignment question posted above with no less than 50 words.To support your response you are required to provide at least one supporting reference with proper citation.