The test-and-retest tool is the first strategy. This analyzes the reliability of the instrument psychologically by focusing only on the time element. The instrument evaluates a group for a measure and utilizes the same measure in the future, as well as establishing a correlational analysis to see if there is divergence or inconsistency (Fishman & Galguera, 2003). The difference in dependability between groups is usually great, but the timeframes are short and the differences grow as the years go by. An instrument may be used to evaluate specific variables. Then it’s used in the same research one to twelve months later in order to identify variations and inconsistencies.
The reliability of the instrument is examined by inter-rater, which involves having several independent judges assess the score. Kline, 2005. To determine if the scores are comparable or whether they have different opinions and ratings, inter-rater compares them. This involves asking several people to evaluate the exact same instrument and comparing their views. The reliability is determined by the consistency of the results.
Parallel-form reliability can be used to measure instrument dependability. The parallel form dependability compares two results generated by the same instrument (Fishman & Galguera, 2003). This instrument compares the results from identically-quality items that have been subject to separate testing.