crash time

normal time

optimistic time

between normal time and crash time

minimum

maximum

zero

infinite

decreasing the direct cost and increasing indirect cost

increasing the direct cost and decreasing the indirect cost

increasing the direct cost and indirect cost both

decreasing the direct cost and indirect cost both

cheapest critical activity

cheapest non-critical activity

costliest critical activity

costliest non-critical activity

resource levelling

resource smoothening

updating

critical path scheduling