The 5 Forces scoring methodology
Objective: Learn to score each force from 1 to 5, compute an overall score and use it to determine the appropriate negotiation strategy.
Scoring each force
Each force is rated on a 1-to-5 scale, from the buyer's point of view:
| Score | Meaning for the buyer | Description |
|---|---|---|
| 5 | Very favourable | The buyer is in a position of maximum strength on this dimension |
| 4 | Favourable | The buyer has significant levers |
| 3 | Balanced | No clear advantage or disadvantage |
| 2 | Unfavourable | The supplier has significant levers |
| 1 | Very unfavourable | The supplier is in a position of maximum strength |
Overall score and interpretation
The total score (sum of the 5 forces) ranges from 5 to 25:
| Total score | Buyer position | Recommended strategy |
|---|---|---|
| 21-25 | Very strong | Aggressive negotiation, reverse auctions, systematic competition, advantageous payment terms |
| 16-20 | Strong | Exploit volume levers, supplier consolidation, ambitious savings targets |
| 11-15 | Balanced | Selective approach, value-based negotiation, active benchmarking |
| 6-10 | Weak | Collaborative approach, partnerships, co-development, long-term contracts |
| 5 | Very weak | Strategic partnership, supply security, medium-term diversification |
How to run the scoring
- Assemble the team: Category Manager + technical business owner + quality manager + supply chain manager
- Collect the data: Number of suppliers, market shares, price trends, patents, barriers, alternatives
- Score individually: Each team member scores the 5 forces independently
- Debate and converge: Group discussion to agree on a consensus score per force
- Document the rationale: For each score, record the facts and data that justify it
⚠️ Warning: A Porter scoring only has value if it is objective and factual. The classic biases: overestimating your buyer position (optimism), underestimating the supplier's power (poor market knowledge), not refreshing the scoring when the market changes. Always back each score with verifiable data.
💡 Key takeaway: Porter scoring turns a qualitative analysis into a quantitative decision tool. A 21-25 score justifies an aggressive approach; a 5-10 score demands a collaborative one. The most common mistake is negotiating aggressively on a market where you are in a weak position, which damages the relationship without results.