Architecture practices carry projects for years, bill against work stages that slip, and depend on a small number of people whose time is the entire product. That combination makes cash flow and resourcing the two things that most often hurt.
An ERP (enterprise resource planning system) holds projects, fee stages, costs, timesheets, invoicing and reporting in one place, so the practice can see where the money and the people are committed.
It does not replace design tooling. CAD, BIM and document management stay where they are. The ERP covers the commercial side: what was quoted, what has been earned, what has been billed and what is left.
In most practices, an ERP becomes the single home for the following: