In the context of advancing technologies and industrial modernization, attention must be directed not only towards production technology but also assembly processes. This article aims to formulate a conceptual solution for rationalizing assembly workplaces, creating an integrated methodology and tools. The theoretical segment reviews the current state of assembly workplaces and systems. An analysis based on predefined criteria reveals the need for a classification system. The practical section proposes a methodology leveraging databases, algorithms, and simulation. A crucial aspect is an electronic database, a key component for rationalizing assembly workplaces and systems in both new and existing production systems.