Determination of fluid category 2. Water in fluid category 1 whose aesthetic quality is impaired owing to: 1  a change in its temperature; or. 2  the presence of substances or organisms causing a change in its taste, odour or appearance, including water in a hot water distribution system.
Credibility is defined as the quality or power of inspiring belief. Credible sources, therefore, must be reliable sources that provide information that one can believe to be true. It is important to use credible sources in an academic research paper because your audience will expect you to have backed up your assertions with credible evidence.
validity and reliability. ï»¿Reliability and validity are important concepts in research. The everyday use of these terms provides a sense of what they mean (For example, your friends are reliable. Your opinion is valid).In research, their use is a little more complex.This column explains the importance of validity and reliability in survey questionnaires or other measures used in a study.he everyday use of these terms provides a sense of what they mean (For example, your friends are reliable. Your opinion is valid). In research, their use is a little more complex. Suppose you hear about a new study on depression in workers who have been disabled by a workplace accident.