The average ERP implementation for an SME takes 14-18 months and costs twice the initial quote. This is so consistently true that it's become accepted as inevitable. It isn't. The timeline and budget blowouts are almost always caused by the same three things, and all three are fixable.
The three causes of ERP failure
- Over-scoping: trying to migrate everything at once instead of in phases
- Under-prepared data: migrating dirty data into a new system and wondering why nothing works
- Change resistance: buying the software before getting buy-in from the people who have to use it
The phased approach
Every successful ERP project we've been involved with followed the same pattern: start small, prove value fast, then expand. Phase one is always the core — the minimum viable set of modules that replace the most painful parts of the current system. For most companies, that's financials, inventory, and basic CRM. Everything else waits.
Phase one of an ERP migration should take 90 days and cost less than you fear. If your vendor tells you otherwise, they're probably over-scoping you.
Data first, always
The most underestimated part of any ERP project is data preparation. Migrating bad data into a new system doesn't clean it — it just moves the problem. Before any ERP goes live, you need a data audit: what exists, where it lives, what's accurate, and what needs to be cleaned or culled. This process typically takes 3-4 weeks and saves months of post-go-live pain.
Get the data right, scope the first phase tightly, and bring your team along before you commit. That's the entire formula for an ERP migration that finishes on time.