It is not easy to measure human motives. The attempts made earlier proved to be too complex. Apart from the practical difficulties involved in putting people into an activity wheel, the very idea of measuring human motivation through activity is ridiculous.
Memory is an internal and unobservable process. At times we feel that we don't remember all that we had learnt earlier. In such a situation, we come face to face with the imperfect nature of our own memories- our cognitive system for learning, storing, and retrieving information and throwing a challenge for its assessment.
Quantitative and qualitative measurements are essential to understand and control the processes affecting the fresh surface water pollution. Depending upon the objectives, the water quality measurement programmes are divided into:
The physical sciences are called exact sciences. The exactness comes from measurements. The study of all subjects in science and technology involves measurements of various types. Measurements are important both from theoretical and practical point of vies.