d

c

b

e

a

Binary bidirectional association

Unary association

Binary unidirectional association

Ternary association

d

c

b

a

65

84

85

Product requirement

Non-functional requirement

Compilation requirement

Functional requirement

Rupees

Months

Persons

Person-months

Earned value / Actual cost

Planned cost – Actual cost

Earned value – Planned value

Actual cost – Planned cost

d

c

b

a

Any of verify order and the verify customer activities must complete, before accept order activity can start

Both the verify order and the verify customer activities must complete, before accept order activity can start

Verify order activity must complete, before both verify customer and the accept order activity can start.

Verify order activity must complete, before any of verify customer and the accept order activities can start

d

c

b

e

a