Explanation
User classes, profiles, or roles are model types that categorize and describe the people who directly interact with a solution. They help to identify the different types of users, their characteristics, needs, preferences, and behaviors. They also help to define the requirements, features, and functions that are relevant for each user group. User classes, profiles, or roles can be represented in various ways, such as personas, user stories, use cases, or user interface prototypes12. References:
User Classes, Profiles, and Roles
User Modeling: Definition, Methods, and Examples