Chain of the reason to buy
Definition adopted by the guide
The sequence of problem, result, justification of a budget line and consequence of disappearance.
CPM-E guide, Appendix A, page 108
Assessed in the Certified Product Manager Enterprise, domain 3: Value proposition and scope decisions.
In detail
Definition and four links
The chain of the reason to buy connects the customer's problem to the reason for funding the product. Its four links are the problem, the result delivered, why that result justifies a budget line of its own, and what would happen if the product disappeared.
For preparation for the CPM-E certification, keep the complete sequence in view. Describing a useful result addresses only one link. The chain also asks why the customer should fund that result and what its disappearance would mean.
Use in product decisions
Use the chain to examine whether the reason to buy remains supported by evidence. The value proposition verification script records usage evidence for every link and the date it was checked. A link without recent evidence is a candidate explanation for falling renewal.
The guide gives an example in which the disappearance link was empty for an entire segment. Renewal fell in that segment two quarters later. The practical task is to identify unsupported links rather than rely on a general claim of customer benefit.
Related terms and distinctions
A value proposition states the result the customer obtains and why it justifies its own budget line. The chain extends that examination to the initial problem and the consequence of disappearance. A separate reason to buy explains why the customer pays instead of accepting something already included elsewhere.
Value erosion is the loss of the reason to buy without a change in price, quality or satisfaction. A weak link can reveal that erosion before renewal falls. Also distinguish the user, who performs the task, from the buyer, who signs the contract and answers for the budget.