The principles in the 12 Steps of AA listed below are the principles in the 12 Steps of Alcoholics Anonymous only, not those in the 12 Steps of any other fellowship that may have adopted or adapted the 12 Steps from AA. The list is drawn directly and exclusively from the two Basic texts of AA: The Big Book and the 12&12. Most are referenced explicitly in the given Step in those texts, or they are referenced implicitly or can be reasonably inferred from them. Some will be obvious, either because they are part of the text itself (e.g. humility in Step 7, willingness in Step 8, prayer and meditation in Step 11) or because they are mentioned repeatedly and discussed at length in the Big Book and/or the 12&12 (e.g., willingness in Step 3, honesty in Step 5).
As will be seen, most Steps embody more than one principle. Moreover, the same principle may be embedded in more than one Step (e.g., honesty in Steps 1, 4, and 5), though their specific function may differ in each. Furthermore, a principle may be the main principle in a particular Step, but a secondary principle in another (e.g., prayer is primary in Step 11 but secondary—though important—in Step 3). Two particular principles, the discipline of surrender and the virtue of humility, are foundational to each of the 12 Steps (even if they are not explicitly mentioned in all—or in the case of surrender, in any). That is, each Step requires us to relinquish our self-will and to admit our deficiency or insufficiency in one way or another. In some Steps, however, these principles may be not only foundational but the primary operational principles. That is the case with surrender in Step 1 and with humility in Step 7.
Some principles are not given their traditional names in the text of the Step (e.g., self-examination is rendered as making or taking inventory in Steps 4 and 10), but the traditional names nevertheless are used when discussed in the Big Book and the 12&12. The principles in each Step are listed in alphabetical order, not according to the order of their importance in that Step. If a principle is explicitly discussed in a Step, you can find the exact passage by searching 164andmore.com
For a full discussion of Steps 1-4, please see PTP123 and PTP4. Future books will discuss Steps 5-12. For a discussion of the principles in each of the 12 Steps, please see their respective posts on this website in Practice These, where additional resources about them can be found.