CHAPTER HIGHLIGHTS The chapter is concerned with what accounting theory is and where it fits within the “structure” of financial accounting. The definition of accounting theory used in this chapter is broad and complements the objectives of the text. Theory itself helps to explain and predict phenomena that exist in a given field, and this likewise holds true in accounting. In accounting, theory can be developed in response to needs arising from practice, including concepts such as realization and matching. However, as an “infrastructure” has developed in financial accounting, theory is formulated in a more institutionalized way by means of the research process. Along with political factors and economic conditions, accounting theory contributes to the standard-setting process. The process of developing standards or making rules is itself largely a deductive process and is certainly concerned with accounting theory. The relationship of theory to measurement is very important. While some see measurement as closely related to but separate from theory (as we did in earlier editions), its importance relative to theory is so great that we now consider it to be part of theory. Measurement is the assignment of numbers to the attributes or properties of objects being measured. The different types of measurements and the quality or “goodness” of measurements are examined. The latter embodies (1) the usefulness of the measurement, illustrated here in a predictive context but showing up later in an assessment mode and (2) verifiability or objectivity, which is the degree of consensus among measurers in the statistical sense. The various valuation models are presented in Appendix 1-A. The models come under the scope of accounting theory. In addition, the different models are mentioned in several theory chapters before being discussed in depth in Chapter 14. Even if there is no desire to go further into inflation accounting in Chapter 14, it is important for students to gain a rudimentary grasp of the concepts involved, as illustrated in Appendix 1-A.