1. A method for managing role-based access in a multi-customer computing environment, the method comprising: associating an actor with a role; associating a policy type with the role; associating a role scope with the role; receiving one or more values for one or more corresponding context parameters associated with the actor; receiving a request for access to a resource from the actor; determining a policy instance based on the policy type and the one or more values for the one or more corresponding context parameters associated with the actor; determining one or more actor-role scope values based on the role scope and the one or more values for the one or more corresponding context parameters associated with the actor; and determining a response to the request based on the policy instance and the actor-role scope values.