The benefits management plan is a component part of the project initiation document (PID) and should be approved at this gateway.
The sponsor ultimately owns and is accountable for benefits realisation, but the project manager will usually have responsible for producing the benefits management plan, in close collaboration with sponsor, senior user and other key stakeholders.
The benefits management plan presents a summary of the project's benefits expected by the business, how they will be delivered and how they will be measured. It will also describe any post-project benefits reviews that are required.
The benefits management plan should establish baselines and targets in order to measure achievement for each benefit identified.