Group members can also have attributes. This allows you to track custom data points for each person as it relates to their membership in the group. Usually, these Group Member Attributes are defined on the Group Type under Admin Tools > Settings > General > Group Types. When they're configured here, the attributes will apply to every group member in groups of this type. You can also add Group Member Attributes to a specific group under People > Group Viewer > Group if you have Administrate access to the group. This also requires that there is at least one Group Member Attribute defined at the group type level, or that the group type has Allow Specific Group Member Attributes enabled.