Clinicians and patients know the importance of correct diagnosis for proper treatment. So important - a correct diagnosis - it is the first theme of this book. Several other themes are also important. A second theme is established as cause and effect, common or peculiar linked entities in at least some humans. A third theme deals with probabilities, both objective and statistical andor subjective probabilities. The fourth theme covers the inhomogeneity among all humans. That is, all people are unique. Is science a theme Not of this kind. Instead, science encompasses all of the themes above and others. Logic holds their framework. The diagnostic model above has been modified by allowing wider scope of inference similar to the earlier differential diagnoses model. A quite radical model called Evidence-Based Medicine EBM, was created about thirty years ago. Its advocates depend largely on statistics, with little interest in science. Discussion and comparisons with traditional and EBM mode