The four criteria for assessing class importance apply to Scillonian entrance graves as follows:
- Period (currency): Long-lived. The tradition of constructing and using entrance graves is a feature of the later Neolithic and early Bronze Age, and although the duration of the tradition is not known with certainty it is likely to have spanned the late third millennium and the first half of the second millennium RCYBC.
- Rarity: Rare. Entrance graves are not numerous, and it is unlikely that very many further examples will be discovered. Approximately 120 examples are known, all of them within a very small area of south-western England.
- Diversity (form): Medium. Within this relatively small group of monuments there are at least four main types which can be recognized on the basis of ground-plan, and there is also a wide range of cairn size and situation.
- Period (representativity): High. Difficulties over dating make the determination of representativity hard to access, but as a class entrance graves entrance graves are among a relatively range of monuments known to be of later Neolithic and early Bronze Age date, and it may be noted that regionally the range of monuments of this period is very restricted indeed.
Assigning scores to these criteria following the system set out in the Monument Evaluation Manual, entrance graves yield a Class Importance Value of 38. This lies just over mid-way up the range of possible values (max.= 64). Examples representing the full range of types, and variations in size and orientation, must also be included in the sample of nationally important examples.