Abstract
It refers to the consistency, stability and repeatability of results i.e. the result of a researcher is considered reliable if consistent results have been obtained in identical situations but different circumstancesThe researcher is always interested in collecting data that are reliable. The reliability of an instrument concerns its consistency and stability. If research are using a thermometer to measure body temperature, he would expect it to provide the same reading each time it was placed in a constant temperature water bath.Regardless of the type of research, the reliability of the study instrument(s) is always of concern. Reliability needs to be determined whether the instrument is a mechanical device, a written questionnaire, or a human observer. The degree of reliability is usually determined by the use of correlation procedures. A correlation coefficient is determined between two sets of scores or between the ratings of two judges: The higher the correlation coefficient, the more reliable is the instrument or the judges. Correlation coefficients can range between –1.00 and +1.00.
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