Property Value

null if this type is declared in a third-party assembly.
Otherwise returns this type Rank numeric value.

When discovering a legacy application, type ranking naturally sorts application types by an order of importance. Hence this code metric can help focusing on most relevant types first.
A homothety of center 0.15 is applied to make it so that the average of all application types.Rank is 1.

Recommendations:
Types with high rank should be more carefully tested because bugs in such types will likely be more catastrophic.

Reference

IType Interface
IType Members