Post-Merger Integration Assumptions Log
This is a practical guide to building a assumptions log for a post-merger integration project — a register of the assumptions the plan depends on, to be validated, adapted to the realities of integrating two organisations after a deal.
What a Assumptions Log is
A assumptions log is a register of the assumptions the plan depends on, to be validated. For the full concept and how it works in general, see Project Assumption. On a post-merger integration project it plays the same role, tuned to this kind of work.
Why it matters for a Post-Merger Integration project
Post-Merger Integration projects live or die on integrating two organisations after a deal. A well-built assumptions log gives the team a shared, explicit reference for exactly that — reducing ambiguity, aligning stakeholders, and making problems visible early enough to act. Skipping it, or doing it generically, is how post-merger integration projects drift into avoidable delay and cost.
What to include
- Assumption
- Impact if wrong
- Owner
- Validation status
Post-Merger Integration-specific considerations
Tailor the assumptions log to the risks that most often derail post-merger integration projects:
- Systems and process consolidation
- People and culture
- Realising synergies
Example
On a real post-merger integration project, the assumptions log would be shaped by integrating two organisations after a deal. In particular, it should explicitly account for the project’s biggest risks — systems and process consolidation, people and culture, realising synergies — rather than treating them as afterthoughts.