We concluded the last section of this book with a reference to the familiar principle popularly known as Occam's Razor. What William of Occam (Ockham) actually said was: “Entities should not be multiplied unnecessarily” (Quodlibeta Septem, c. 1320). It is sound advice for both life and science and for analytical chemistry in particular, where the practicing chemist must assemble a course of action from a large array of possible manipulative procedures. In today's laboratories, once the test portion has been dissolved it is frequently possible to proceed directly to the analyte measurement. Modern instrumentation has made this course of action much more common than ever before, and future developments will further extend this trend.