I am continuing to build business models using Archimate, but I am getting bogged down in functions, processes, services and interfaces,

To my mind Archimate seems to move the modeling of the Business (ie that which is not IT see Tom Graves ) only a little way on from the practice of Business Process Modeling.

Archimate still seems to have a “start with IT and from an IT perspective” feel to it. Or put another way “how can we answer the what & why IT is needed”.

This may be the result of my mind set, however it may also be a result of trying to make Archimate compatible with UML, so that for instance an existing class model can be referenced in an Archimate model.

What I am trying to imagine, is how to represent say a centralized hierarchical organization as opposed to a decentralized flat structured organization. Can a decision be represented as a function, process or an interaction?