Doubling Up Rule Some honours may be included in more than one Master Award. For example, the Shells Honour is part of the Naturalist Master and also the Zoology Master Award. The rationale is that a shell is part of nature and it is also an animal. If a Shell Honour has been used to earn a Naturalist Master Award, the same honour cannot be used to earn a Zoology Master Award. This 'Doubling Up' rule applies to all honours in such a situation.