ERP Strategy & Design

The SAP S/4HANA decision is rarely a technology decision. It is a business architecture decision disguised as a migration project. The approach you choose—brownfield, selective transformation, greenfield, or some hybrid across business units—locks in your cost structure, your process flexibility, and your organizational complexity for the next decade. The difference between the cheapest and most expensive path is routinely a factor of five to ten.

Most organizations start this process by asking their SI for a recommendation. The SI responds with a proposal that optimizes for their delivery model, not your business outcome. That is not malice; it is structural incentive. A greenfield program generates three to five times the revenue of a brownfield conversion for the same client. The question is not which approach is technically correct. The question is which approach delivers the business value your executive committee actually approved.

We help organizations separate the business architecture decision from the SI’s commercial interests. That means running the approach evaluation independently: mapping your processes against standardization readiness, stress-testing cost scenarios with real benchmark data, and presenting your executive committee with a decision framework they can actually use rather than a 200-page SI proposal they cannot challenge.

The wrong approach selection costs between 18 and 36 months of program time and typically doubles the total investment before anyone admits the original path was flawed. By then, the SI contract is signed, the team is staffed, and reversing course means writing off sunk cost and restarting vendor selection. The business case that justified the investment no longer holds, but the program continues because stopping feels worse than continuing.

The right approach selection, by contrast, can be completed in four to six weeks with a small independent team. The cost of getting this decision right is a fraction of the cost of getting it wrong.