What is the shortest honest answer?
Run the purchase as an operating-model and data programme, with software selection inside it—not as a software demonstration followed by an import.
Sequence scope, data, supplier proof and delivery around explicit decision gates.

Illustrative 42-week planning schedule · select a stage to open its decision gate.
| Stage / decision gate | Weeks 1–6 | Weeks 7–12 | Weeks 13–18 | Weeks 19–24 | Weeks 25–30 | Weeks 31–36 | Weeks 37–42 |
|---|---|---|---|---|---|---|---|
| 1. Mobilise →Weeks 1–2 | |||||||
| 2. Define scope →Weeks 3–6 | |||||||
| 3. Prepare data →Weeks 4–10, continuing as needed | |||||||
| 4. Requirements and proposals →Weeks 7–12 | |||||||
| 5. Demonstrations and proof of concept →Weeks 11–16 | |||||||
| 6. Diligence and contracting →Weeks 13–18 | |||||||
| 7. Detailed design and foundations →Weeks 19–24 | |||||||
| 8. Build and integrate →Weeks 25–32 | |||||||
| 9. Rehearse and accept →Weeks 29–36 | |||||||
| 10. Cut over →Weeks 37–38 | |||||||
| 11. Stabilise →Weeks 39–42 | |||||||
| 12. Renew or exit →Ongoing |
The following 42-week planning example assumes a phased deployment, an available internal team and a limited first release. Activities overlap deliberately.
Run the purchase as an operating-model and data programme, with software selection inside it—not as a software demonstration followed by an import.
Keep all four options open until the first workflow and its failure points are understood.
Name the future operating team before shortlisting.
Separate selection, supplier implementation, buyer readiness and stabilisation.
Write a two-page decision charter before inviting demonstrations.
Choose one end-to-end workflow, including its exceptions and reporting—not a collection of disconnected modules.
Create a controlled source inventory and preserve the original data before deduplicating anything.
Write requirements as observable behaviour, with an owner and acceptance method.
Use a buyer-owned scenario pack and retain the evidence.
Evaluate the proposed service, its delivery partners and your own operating design together.
Make every configuration decision explainable and maintainable by the future operating team.
Specify an integration as a supported business process, not as a connector name.
Run a repeatable migration rehearsal with documented reconciliation before production cutover.
Specify which system is authoritative at every point in the transition.
Treat administration as a funded service with a backlog, change process and deputy—not an informal extra duty.
Test portability while the relationship is healthy and the implementation team is still available.
Use this proposed exception table at each steering meeting. | Warning sign | Recommended response | | | | | Sponsor wants a platform but cannot name the fi
Produce decision evidence, not a long supplier list.
Final recommendation: retain ownership of scope, data, acceptance and operation even where you buy specialist help.
The sources below support factual statements.
No questions match. Try a different term.
Strong fit for regulated US buyers owning selection, migration and post-launch operation. Provides a complete staged plan, responsibility map, field-level migration model, RFP structure, demonstration tests, commercial checklist, transparent USD TCO and exit process. Primary regulator, professional-body and product sources support factual claims, with recent procurement, employment, training and migration evidence. Source confidence is limited by absent private quotations, customer interviews and hands-on testing; some IBM documentation was accessible only through detailed indexed results. Timelines, staffing and costs are explicitly illustrative rather than disguised benchmarks.
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