Occurrences Diagram

Pictorial mapping of the occurrences between two entities assists in understanding connectivity and cardinality

C1 T1

C2 T2

C3 T3

C4 T4

C5 T5

C6 T6

A child may rent between 0 and 3 toys; a toy may only be rented by 0 or 1 child. One child may rent many toys (1:M)