Week 8

Question 1

What is efficient scheduling?

Answer 1

Scheduling to meet due dates and face time based competition.
*Internal effective scheduling- faster movement of services and goods through facility
*external effective scheduling- faster throughput, increased capacity etc.

Question 2

Forward scheduling

Answer 2

Starts scheduling as soon as job requirements are known, then sets the due date (hospitals, clinics, restaurants)
+can be accomplished even if due date is missed
- can cause build up in WIP

Question 3

Backward scheduling

Answer 3

Begins with due date and then schedule back the operations and other jobs in reverse. (Catering, banquet, scheduled surgery)

Question 4

Finite loading

Answer 4

Assessing work only up to the capacity of the process. If more work>capacity -> due dates are pushed further.

Question 5

Infinite loading

Answer 5

Assessing work without the regard to the capacity of the process, most MRP systems are like it.
+ Initial schedule meets due dates, they do not have to be adjusted if workload > capacity.

Question 6

4 criteria of the scheduling

Answer 6

1. Minimise completion time
2. Max. utilization time
3. Min. WIP inventory
4. Min. cost waiting time

Question 7

Scheduling approaches

Answer 7

1. Process focused facilities (Job shops)
   Frequent changes in volume and variety of jobs, clients etc. Due date focused, follow finite loading.
   2.Work cells
   Focused facilities that process families of similar products. Forward looking, due dates generate w/ MRP. Kanbans, priority rules.
2. Repetitive facilities (assembly line)
   Forward looking, finite loading. Balancing line w/ traditional assembly techniques. Pull techniques as Kanbans, JIT.
   - Not for new or product changing process.
   4.Product focused facilities (continuous)
   Finate loading, forward looking that is able to meet stable demand and capacity.

Question 8

2 Loading approaches

Answer 8

1. Gantt Charts- visual representation of allocated time
   2.Assignment method (Hungarian)

Question 9

Input-output control

Answer 9

System that allows operations personnel top manage facility work flows by tracking work flow, completion.
Can be maintained by syst. ConWIP cards- cards that control amount of work in work centre.