Advantages of Predetermined Motion Time System

a.  They enable development  of standards  before  the job  is started,

b.  They have  been tested  extensively in the laboratory and  field.

c.  They  include performance  rating in  the times  given  in the  tables so users need  not calculate  them.

d.  They are  accepted  as part  of many  union  contracts.

Disadvantages of Predetermined Motion  Time System

1.  It is  applicable  only  for the  hand, eye and body  motions  of an  individual  ( not for  group  work  or for anything  other  than  hand eye body  motions) process  times  and or machine  times  if any  may have  to be  established  by other  means.

2.  Although it  offers  advantages of  clarity of comprehension  for trained  analysts  it may baffle the  ordinary  worker with  too lengthy details.

3.  Allowances for  other  than ordinary  working  conditions  becomes  very  important / critical in the  calculation of the  standard  times.  The stopwatch  time study  implicitly takes  care  of a major fraction  of  these  allowances  due to  its direct observation  techniques .

4. Jobs involving  extremely high  degree of control  cannot  be measured  by it.

5. The   detailed  analysis  consume much time  and therefore  the economics  may not  favour  measurement  of non  repetitive  work with  this method.