Abstract
To understand fully the structure and behavior of stars, it is essential to use all the information possible. Photometry, high-resolution spectroscopy, and the MK Process all involve the spectrum, but each provides a fundamentally different approach to the discovery of stellar character. While each can be used to calibrate the others, there are no one-to-one, unique relationships which work for all stars at all times. The MK Process, with its emphasis on the appearance of the entire spectrum and on the comparison with a set of standard stars, provides a useful reference for studies involving photometry and high-resolution spectroscopy. The ideal complete study includes all three approaches. While errors do occur and can be revealed by the inter-comparisons, it is important not to assume automatically that all differences are mistakes; often they are signatures of some interesting and unusual peculiarities. Whatever differences arise from the use of these three methodologies can provide new information at the interfaces. Illustrative examples are given.
