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A. MEANING OF QUALITY Quality includes several aspects. Let us take, for example, two statements ex-pressed orally: (1) “Today is a warm day”, and (2) “Today the temperature will be 95 degrees F.”. Both are similar statements, but 1 is qualitative, whereas 2 is quantitative. We are able to assess the temperature in the qualitative form by using our senses or by utilizing a thermometer to determine the temperature precisely in the quantitative form. This simple example shows, that quality and quantity are related and sometimes are interchangeable. This exchangeability of quality and quantity was a problem for many philosophers dating back to the ancient Greeks. Numerous theories have ex-isted which have gone through evolutionary changes right up to the time of Ein-stein’s new theories in physics. The ancient Greeks thought, that matter has inher-ent qualities, like hardness or color. Atomic theory indicates that the atoms have no quality like hardness or color. Only structures of elements can get qualitative properties. B. QUALITY VERSUS QUANTITY VERSUS SUBSTANCE The above mentioned statements indicate that there are differences and commonal-ties between quality, quantity, and substance. Philosophers