Type II Relationship:

In this relationship, any non-bottleneck resource (N) feeds work-in-process material (WIP) to a bottleneck (B) resource.

Legend B N     

           B   Bottleneck resource, having slower processing rate, b

            N   Non bottleneck resource having faster processing rate; n (note, b < n)

                    Material flow

Figure: Type II Relationship

In these relationships, because of the difference between the supply rate of non-bottleneck (N) and bottleneck, inventory is piled up among the non-bottleneck and bottleneck resources.