Responsible - the group or person who actually does the work as part of their job. They execute this work under the direction and authority of accountable owners.
Accountable - the business owner (person or group) with sign-off authority. They are ultimately accountable for this work. They approve project business cases and milestones, and the standards, guidelines, policies and procedures for a given area.
Consulted - groups or individuals who should be involved in discussions and decision-making. Their input, insights and concerns should be considered in prioritizing and setting direction.
Informed - groups or individuals who should be kept informed of decisions and progress.