This chapter deals with the basics of converting qualitative decision reasoning into quantitative models according to the logically consistent rules or norms of applied decision theory (ADT). These norms make use of quantitative readings of parts of your mind that judge uncertainty (probability) and value (utility). They allow checks of the consistency of these readings, and they can identify the choice these readings imply. (How to use ADT models effectively on real dilemmas is addressed in Chapter 8.)