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Defined roles and responsibilities

The principle

A PRINCE2 project has defined and agreed roles and responsibilities within an organization structure that represents the business, user and supplier interests.

Projects involve people. No planning or control is helping if the wrong people are involved, if the right people are not involved, if people don't know what exactly is expected of them or if people don't know what they can expect of others.
Lack of an appropriate organization structure is therefore one of the most common reasons of project failure.

A project organization is different from a line organization. There may be resources required from different functional departments, even from different organizations and have a mix of full-time and part-time resources.
To be successful, projects must have an explicit project management team structure, with defined and agreed roles and responsibilities for people involved in the project and the means for effective communication between those people.

A PRINCE2 project recognizes the following primary stakeholders.
Business, who ensure that the investment provides value for money.
Users, who will use the products to realize benefits.
Suppliers, who provide the resources and skills required by the project.
The interests of these stakeholders must be respresented effectively in the project - two out of three is not enough.

Used sources

Managing Successful Projects with PRINCE2, 2009 edition