GRPI stands for Goals, Roles, Processes and Interpersonal Relationships. These are the four critical and interrelated aspects of teamwork. GRPI model was introduced by Richard Beckhard back in 1972 and later popularized by Irwin Rubin, Mark Plovnick, and Ronald Fry. Today it is still one of the most widely-used team effectiveness models. GRPI is an effective tool for teamwork issues diagnosis and team development.
    Team Qualities - Teamleadsky
    Clear goals give guidance to the team members, help to assess progress and see in advance possible delays. Shared goals help the members of a team better understand each other and build on top of each other's ideas. Team members working towards clear common goal are likely to improve their commitment.

    Roles define who does what and make explicit the expectations team members have of one another. As long as uncertainty or disagreement exists with regard to these, taking responsibility will be an issue in the team. Without taking responsibility collaboration will suffer, and it will be difficult for the team to get things done.

    Processes are about how the team works. Clear agreements on the processes set the stage for effective collaboration, create calm and a feeling of safety. A lack of well defined processes can lead to uncertainty and be cause for disputes and conflicts.

    Interactions/Interpersonal relations
    Relationships and interactions affect all the other aspects of teamwork. They help the team members develop consensus about its goals, find ways to clarify its roles, and define the processes critical to team success.
    GRPI model is a useful tool for designing new teams as well as helping existing teams operate more effectively. Using this simple model, you can clearly point out problems with the group and work together to find a solution.