How are credits awarded for certification?

During the assessment process, each category is sub-divided into a range of issues in the form of questions.  Each question has a list of answer options that set out successively higher levels of performance.  Credits are awarded based on the answer option that has been selected, with higher numbers of credits awarded for better environmental outcomes.  The credits achieved are then weighted based on the relative impact of the category to calculate the overall score.  Once the building has been fully assessed, a rating is achieved based on the overall score.