A Category model element carries the CreditGroups and Credits for one category within a particular certification scheme.

GreenDesk employs a simple "empty star, half-star, full-star" system to help users easily see how they are making progress towards earning category points:

• No credit groups have been 'accepted' yet (according to the expert system) so no points have been counted towards the category.
• At least some credit groups for the category have been 'accepted', but not all available points have been counted towards the category. Such a category is considered "partially accepted".
• All available points have been counted towards the category.