$19.$ What is the difference between having a safety lead time ofone period and simply adding

one period to the plannedlead time? Whatis the same?

$20.$ Whatis nervousness in an MRP system? How is it caused? Why is it bad? What are some

things that can be done to prevent it$?$

$21.$ Whatis MRPII? Why was itcreated?

$22.$ Why mightrough$-$cut capacity planning be optimistic? Why might it be pessimistic?

$23.$ Why iscapacity requirements planning not very accurate? What assumptions are made in

CRPthat are the same as those in MRP$?$

$24.$ Whatis the purpose ofdispatching? What are dispatching rules? Why does shortest process

time seem to workpretty well? When does earliest due date work well?

$25.$ Whatis the purpose ofinput$/$output control? Why is itoften "too little, too late"?