The Cost Management Index is a tool to help develop a conversation between clients and suppliers about managing cost increases. Each party reviews the supplier against five dimensions and scores the supplier's performance against each dimension.

It is better to avoid price increase requests than to react to them. The tool engages the parties in a joint dialogue. Ideally, both parties participate, (and best of all if the supplier's procurement team is involved!).
But it could be used by just one party only