The RACI Matrix : how to define roles and responsibilities on a project ?

The RACI Matrix : how to define roles and responsibilities on a project ?

raci matrix how to define roles and responsibilities project
Posted by David Galiana, on Monday 21 October 2019, updated on Wednesday 22 June 2022

To ensure that your project is a success, you must put your organisation on display, put in place effective management, define the roles and responsibilities of everybody in a clear and precise manner, have a motivated team and use high performing tools like Wimi.

When a project is launched, you especially want to avoid questions like, “who is doing what?” or “who is in charge of this task?”. The distribution of roles and responsibilities of each person is essential to succeed on projects because if tasks are not clearly attributed, colleagues will either send back the workload, or forget to finish such a task, and the whole project will then fall behind.

Here is a small story which perfectly illustrates this situation:

“Once upon a time, there were four people called Everybody, Somebody, Everyone and Nobody. There was important work to do and Everybody was asked to do it.

Everybody was persuaded that Somebody would do it.

Everyone could have got it done, but in reality Nobody did it.

Somebody was angry because it was Everybody’s work!

Everybody thought that Everyone could do it. And Nobody doubted that Somebody would do it.

Finally, Everybody told off Everyone because Nobody had done what Somebody could have done.”

Moral of the story:

Without wanting to tell off Everybody, it would be good if Everyone did what they should do, without feeding into the hope that Somebody will do it instead. As experience shows, where Somebody is waiting, we generally find Nobody.

Fortunately, tools exist to help you precisely define the roles of everybody. The RACI Matrix is one of those tools.

What is the RACI Matrix?

It is a simple-to-use management tool which is presented in the form of a table which allows you to share out the functions and responsibilities between the different people carrying out a project.

RACI is an acronym which means:

  • R: Responsible or the person who carries out the task
  • A: Accountable or the person who supervises and approves the carrying out of the task
  • C: Consulted or the person who advises
  • I: Informed or the person who is told about the task

In a nutshell, the RACI Matrix allows you to define:

  • who are the operating members of the project and their respective tasks
  • who is the only decision-maker
  • who can be asked for advice
  • who should be informed about the progression of each task

Sometimes called the Responsibilities Matrix, or RAM (Responsibility Assignment Matrix), the RACI Matrix gives the leader of a project a total view of the assignment of resources and the sharing of workload in a project. In this way, you can ensure that all the tasks are shared out equally among all resources and avoid a colleague being overloaded with work while another is completely forgotten.

This tool is particularly effective in the case of complex projects, among which it is sometimes difficult to know who is responsible for a task, milestone or stage.

How does the matrix work?

In the table, every task is attributed to one single person in charge (A), but many people can be involved in carrying it out (R). All participants of the project know who they should address if they have doubts or questions (C) and which people to inform (I) concerning the proceedings of such and such a task.

The RACI Matrix is built in the form of a double-entry table:

  • along the bottom: the different tasks, actions, milestones, stages and deliverables to carry out ;
  • in the columns: the different contributors (not necessarily the name of the team members, but rather mentioning the functions, services and experience required) ;
  • in every cell: the letter R, A, C, I determine the roles and responsibilities of everyone

The rules to respect:

  • There must be at least one R for every task. These are the people in charge of accomplishing it
  • The A approves and validates the tasks which they are in charge of and ensures its progress in respect of deadlines. They are responsible for the organisation and results produced by the R or Rs. In this way, if the Rs fall behind or do not reach the objectives, it is the A who is in charge of the situation. There is not one single and unique A for every task, but the A can also have the role of an R.
  • The C or Cs (people or groups) have an expertise in a specific domain. They can be asked for advice by the A and/or the Rs, however they do not have any authority over the task. It is the A who decides whether or not the opinion of C is applied
  • The Is do not intervene but they can be directly or indirectly impacted by the projects (users, provides, people in charge of peripheral projects, etc.). They should therefore be informed of the how the project is coming along and the important decisions

The limits of the RACI Matrix

We can note three main limitations of this tool.

First of all, the RACI Matrix is only a resource allocation tool and not one for the definition of the tasks of a project. In order for it to work, you must determine in advance the different stages of your project and all the tasks and activities necessary for its completion. It does not take the financial aspect of the project into account (like the costs linked to the carrying out of a task).

Then, as the leader of the project, you must make sure the roles and responsibilities are attributed in a balanced way between all the participants of the project to avoid an overload or under-load of work between the different members of the team.

The RACI Matrix is not an automated system. Therefore, you should update it regularly in case of changes in the tasks or turnover within the team.


Easy to use, the RACI Matrix is an essential tool for defining the roles and responsibilities of all the participants of a project and avoiding the risks of overlapping or conflict of resources.


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