The notes laid down on musical scores are the model elements for music. The object-oriented approach to software development proposes the equivalent of notes — objects — to describe software.

Methods also define a representation — often graphical — that allows both the easy manipulation of models, and the communication and exchange of information between the various parties involved. A good representation seeks a balance between information density and readability.

Over and above the model elements and their graphical representations, a method defines the rules that describe the resolution of different points of view, the ordering of tasks and the allocation of responsibilities. These rules define a process that ensures harmony within a group of cooperating elements, and explains how the method should be used.

As time goes by, the users of a method develop a certain 'know-how' as to the way it should be used. This know-how, also called experience, is not always clearly formulated, and is not always easy to pass on.