* Definition of a language in which to discuss observable and quantifiable phenomena or what words shall we use and what do they mean? * Scientific hypotheses and facts or escape from indecision and what shall we talk about? * Classification of scientific disciplines or the names we give to different subjects. * Comparison of "How" theories to "Why" theories or do we want to predict or do we want to understand? * Comparison of "Reductionist" theories to "Holistic" ones or is the whole the sum of its parts or more?