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.
When choosing and developing primary research, one must consider the most appropriate method, to include its reliability, validity and practicality. Reliability. There are many debates over what is and is not reliable within research. Within the natural sciences, data are seen to be reliable, as they can be tested by different researchers at different times to find out the same or similar information.