Steps in validating research instruments
The key variables should have been identified in Step 2: Identify Key Variables and Research Design.
Now that the sample has been identified, the researcher must now transition to thinking about what the variables mean both theoretically and practically to determine how to measure the key variables in the study.
When designing an instrument, keep in mind the following: Developing an instrument takes a lot of work and advanced preparation.
It is very important that the instrument has been thoroughly critiqued, evaluated, and pilot tested by the student, supervisor, and others before it is administered for the actual study.
(the process of developing, testing, and using the device).
As a process, validation involves collecting and analyzing data to assess the accuracy of an instrument.
There are numerous statistical tests and measures to assess the validity of quantitative instruments, which generally involves pilot testing.
The remainder of this discussion focuses on external validity and content validity. Establishing eternal validity for an instrument, then, follows directly from sampling.
Once the instrument has been administered, it cannot be changed.
Any problems with the instrument after it has been administered will require the student to completely redo the data collection process, wasting considerable time and money.