For enterprise buyers
Use the Fourth Cloud instrument before signing an on-prem control plane contract. The output is a gap portfolio you'd own — not a vendor ranking.
The buyer's question
Which gaps am I willing to own over five years? The instrument identifies the gaps; Section 2.6 of Townsend's framework estimates what each costs to own. A Closeable gap is a real contract you have not signed yet. A Structural gap is a constraint of the on-prem operating model that no vendor closes today. An Opinion gap is configuration of capability you already have. Each carries a different 5-year burden.
How to use the assessments
- Start with the cross-vendor comparison. Identify which layers each vendor calls a strength and which it concedes structurally.
- Read the identity plane continuity finding for each vendor. This is the single most expensive invisible gap in on-prem deployments. A vendor with strong individual layers but a score of 1 on identity is asking you to build a bridge for every cross-layer enforcement requirement.
- For each vendor under consideration, open the assessment page. Read the FC-2C and FC-4 layers first. These are the two most consistent gap surfaces in the on-prem control plane market.
- Apply your own filter: which gap-ownership classifications am I willing to own? Closeable gaps are real money. Opinion gaps are configuration time. Structural gaps mean accepting a constraint.
Watch for vendor framing
- Opinion/Closeable conflation. A vendor claiming a gap is "just configuration" when closing it requires acquiring a new platform. Apply the test: does closing this gap require signing a new contract or deploying software you do not already have? If yes, it is Closeable regardless of how simple the vendor makes it sound.
- Scope inflation. A vendor claiming universal workload coverage based on AI workload capability alone. The Fourth Cloud universality test applies at every layer.
- Delivery model conflation. A vendor claiming F2=3 resource lifecycle automation for software that runs on customer-owned hardware. The consumption model must be the vendor's actual go-to-market offering, not a theoretical deployment option.
- Identity plane inflation. A vendor claiming federated identity (score 3) when their federation layer does not actually reach all layers. Check the
layersInPlanearray — it is the evidence.
This is not a procurement recommendation
The instrument does not produce a winner. It produces a gap portfolio map for each vendor. The buyer reads that alongside their own constraints — budget, existing tooling, compliance posture, AI workload commitment — and decides which vendor's gap portfolio is the one they want to own.