Lecture 6 & 8

Question 1

Control meaning

Answer 1

understanding what is actually happening in the operation and deciding whether there is a significant deviation from what should be happening

Question 2

P:D ratio

Answer 2

method for planning and control.
P- process time
D - demand time

When P:D = 1 = customer waiting time equals the time it takes to obtain the resources, produce and deliver

Question 3

Planning and control activities

Answer 3

-Scheduling - when to do
-Loading - how much to do
-Sequencing - in what order to do
-Monitor and control - is everything according to plan

Question 4

Finite vs infinite loading

Answer 4

Finite - load is limited to capacity, infinite - load can exceed capacity

Question 5

Sequencing meaning

Answer 5

setting priorities based on a predefined set of rules

Question 6

Ways of sequencing

Answer 6

-Customer priority - most urgent customer problems solved first
-Earliest due date - deadlines that are closest are being tackled first
-LIFO - last in first out
-FIFO - first in first out
-Longest operation time - utilization is kept and less changeover time required
-Shortest opetation time

Question 7

Push system meaning

Answer 7

items are moved onto the next stage as soon as they have been processed.

Question 8

Pull system

Answer 8

Items are moved only when the next stage wants them

Question 9

Materials requirements planning (MRP-I)

Answer 9

Focus on material flows

Question 10

Manufacturing resource planning (MRP-II)

Answer 10

inclusion of the capacity dimension

Question 11

Bill of materials (BOM)

Answer 11

several levels of the product structure at the same time

Question 12

Enterprising resource planning (ERP)

Answer 12

brings all relevant info for planning and control together. Capable of integrating whole supplu chains including suppliers’ suppliers and customers’ customers

Question 13

Efficiency & Utilization formulas

Answer 13

Efficiency = Actual output/Effective capacity

Utilization = Actual output/Design capacity

Design capacity = max capacity
Effective capacity = Capacity after planned loss
Actual output = Capacity after planned and unplanned loss

Question 14

Three methods of reconciling capacity and demand

Answer 14

1. Absorbing demand by leveling capacity
2. Adjusting output to match demand (Chasing demand)
3. Changing demand (Demand management)