The central theme of the reform of municipal budget law in Schleswig-Holstein is the transition of the budget, cash, and accounting systems from the previous cash-based system to double-entry bookkeeping, referred to as "Doppik." The now 15th edition of this established work comprehensively presents both the cash-based and double-entry regulations in their most current versions, along with explanations and comments from the authors. This handbook is therefore particularly suitable for all administrations that are practically engaged in the transition to the new accounting system.