Aggregate Planning - author.uthm.edu.my
Transcript of Aggregate Planning - author.uthm.edu.my
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© Wiley 2010 1
Aggregate Planning
Operations Managementby
R. Dan Reid & Nada R. Sanders4th Edition © Wiley 2010
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© Wiley 2010 2
Learning Objectives
Identify different aggregate planning strategies & options
for changing demand and/or capacity in aggregate plans
Develop aggregate plans, calculate associated costs, and
evaluate the plan in terms of operations, marketing,
finance, and human resources
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The Planning ProcessFigure 13.1 Long-range plans (over one year)
Capacity decisions critical to long range plansIssues:Research and DevelopmentNew product plansCapital investmentsFacility location/expansion
Intermediate-range plans (3 to 18 months)
Issues:Sales and operations planningProduction planning and budgetingSetting employment, inventory,
subcontracting levelsAnalyzing operating plansShort-range plans (up to 3 months)Scheduling techniquesIssues:Job assignmentsOrderingJob schedulingDispatchingOvertimePart-time help
Top executives
Operations managers with sales and operations planning team
Operations managers, supervisors, foremen
Responsibility Planning tasks and time horizons
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S&OP
and the
Aggregate
Plan
Figure 13.2
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Aggregate Planning
The objective of aggregate planning
is usually to meet forecast demand
while minimizing cost over the
planning period
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Aggregate Planning
QUARTER 1
Jan. Feb. March
150,000 120,000 110,000
QUARTER 2
April May June
100,000 130,000 150,000
QUARTER 3
July Aug. Sept.
180,000 150,000 140,000
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Aggregate Planning Goals
Meet demand (sales forecast)
Use capacity efficiently
Meet inventory policy
Minimize cost
Labor
Inventory
Plant equipment
subcontract© Wiley 2010 7
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Aggregate Planning Strategies1. Should inventories be used to absorb
changes in demand?
2. Should changes be accommodated by varying the size of the workforce?
3. Should part-timers be used, or should overtime or idle time absorb fluctuations?
4. Should subcontractors be used and maintain a stable workforce?
5. Should prices or other factors be changed to influence demand?
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Capacity Options
1. Changing inventory levels
▶ Increase inventory in low demand periods
to meet high demand in the future
▶ Increases costs associated with storage,
insurance, handling, obsolescence,
pilferage, and capital investment
▶ Shortages may mean lost sales due to long
lead times and poor customer service
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Capacity Options
2. Varying workforce size by hiring or
layoffs
▶ Match production rate to demand
▶ Training and separation costs for hiring
and laying off workers
▶ New workers may have lower productivity
▶ Laying off workers may lower morale and
productivity
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Capacity Options
3. Varying production rates through
overtime or idle time
▶ Allows constant workforce
▶ May be difficult to meet large increases in
demand
▶ Overtime can be costly and may drive
down productivity
▶ Absorbing idle time may be difficult
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Capacity Options
4. Subcontracting
▶ Temporary measure during periods of peak
demand
▶ May be costly
▶ Assuring quality and timely delivery may be
difficult
▶ Exposes your customers to a possible
competitor
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Capacity Options
5. Using part-time workers
▶ Useful for filling unskilled or low skilled
positions, especially in services
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Demand Options1. Influencing demand
Use advertising, promotion, selling, or price cuts to increase demand in low periods
Attempt to shift demand to slow periods
May not be sufficient to balance demand and capacity
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Demand Options
2. Backordering during high-demand
periods
▶ Requires customers to wait for an order
without loss of goodwill or the order
▶ Most effective when there are few if any
substitutes for the product or service
▶ Often results in lost sales
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Demand Options
3. Counterseasonal product and service
mixing
▶ Develop a product mix of counterseasonal
items
▶ May lead to products or services outside
the company’s areas of expertise
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Aggregate Planning Options
TABLE 13.1 Aggregate Planning Options
OPTION ADVANTAGES DISADVANTAGES COMMENTS
Changing inventory levels
Changes in human resources are gradual or none; no abrupt production changes.
Inventory holding cost may increase. Shortages may result in lost sales.
Applies mainly to production, not service, operations.
Varying workforce size by hiring or layoffs
Avoids the costs of other alternatives.
Hiring, layoff, and training costs may be significant.
Used where size of labor pool is large.
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Aggregate Planning Options
TABLE 13.1 Aggregate Planning Options
OPTION ADVANTAGES DISADVANTAGES COMMENTS
Varying production rates through overtime or idle time
Matches seasonal fluctuations without hiring/ training costs.
Overtime premiums; tired workers; may not meet demand.
Allows flexibility within the aggregate plan.
Sub-contracting
Permits flexibility and smoothing of the firm’s output.
Loss of quality control; reduced profits; loss of future business.
Applies mainly in production settings.
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Aggregate Planning Options
TABLE 13.1 Aggregate Planning Options
OPTION ADVANTAGES DISADVANTAGES COMMENTS
Using part-time workers
Is less costly and more flexible than full-time workers.
High turnover/ training costs; quality suffers; scheduling difficult.
Good for unskilled jobs in areas with large temporary labor pools.
Influencing demand
Tries to use excess capacity. Discounts draw new customers.
Uncertainty in demand. Hard to match demand to supply exactly.
Creates marketing ideas. Overbooking used in some businesses.
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Aggregate Planning Options
TABLE 13.1 Aggregate Planning Options
OPTION ADVANTAGES DISADVANTAGES COMMENTS
Backordering during high-demand periods
May avoid overtime. Keeps capacity constant.
Customer must be willing to wait, but goodwill is lost.
Many companies backorder.
Counter-seasonal product and service mixing
Fully utilizes resources; allows stable workforce.
May require skills or equipment outside the firm’s areas of expertise.
Risky finding products or services with opposite demand patterns.
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Mixing Options to Develop a Plan
Chase strategy
Match output rates to demand forecast for each period
Vary workforce levels or vary production rate
Favored by many service organizations
Vary production rates to meet changes in demand.
Often used when inventory cannot be used or when resources are flexible and inexpensive to change.
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Mixing Options to Develop a Plan
Chase strategy
The company must have enough capacity to be able to meet the peak demand.
Sufficient machinery and equipment
Hire and train people for the peak periods and lay them off when the peak is past.
Add extra shifts and overtime.
Advantage – Inventories can be kept to a minimum. Thus, the cost associated with carrying inventories are avoided.
Disadvantage – Cost added to cater the capacity.
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Demand
Chase ProductionNo. of Units
Time
Chase Production:
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Mixing Options to Develop a Plan
Level strategy
Daily production is uniform
Use inventory or idle time as buffer
Stable production leads to better quality and productivity
Some combination of capacity options, a mixed strategy, might be the best solution
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Mixing Options to Develop a Plan
Level strategy
Daily production is uniform
Use inventory or idle time as buffer
Stable production leads to better quality and productivity
Producing an amount equal to the average demand.
Often used when resources difficult or very expensive to change.
Advantage – Smooth level of operation that avoids the costs of changing production levels.
Disadvantage – Inventory will build up in low demand periods. Thus, incurred cost of carrying and holding the item
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Demand
Level Production
No. of Units
Time
Level Production:
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Demand
Level Production
No. of Units
Time
Level Production:
CREATE Inventory
USE Inventory
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Mixing Options to Develop a Plan
Some combination of capacity options, a mixed strategy, might be the best solution hybrid
use some combination of some chase and some level strategy.
it will have its own set of cost characteristics.
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Demand
Hybrid
No. of Units
Time
Hybrid Strategy
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© Wiley 2010 30
Aggregate Planning Options
Demand-based options
Reactive: uses finished goods inventories and
backorders for fluctuations
Proactive: shifts the demand patterns to minimize fluctuations e.g. early bird dinner prices at a restaurant
Capacity-based options
Changes output capacity to meet demand
Uses overtime, under time, subcontracting, hiring, firing, and part-timers – cost and operational implications
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© Wiley 2010 31
Developing the Aggregate Plan
Step 1- Choose strategy: level, chase, or Hybrid
Step 2- Determine the aggregate production rate
Step 3- Calculate the size of the workforce
Step 4- Test the plan as follows:Calculate Inventory, expected hiring/firing, overtime needs
Calculate total cost of plan
Step 5- Evaluate performance: cost, service, human resources, and operations
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Aggregate plan
Plan 1- To maintain a constant workforce at alevel necessary to meet average demand.
Plan 2. To maintain a constant workforce at alevel necessary to meet the lowest demandand to meet all the demand above this levelby subcontracting.
Plan 3- To vary the workforce by hiring orlaying off. The production rate=forecastdemand at each month.
© Wiley 2010 32
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Graphical Methods1. Determine the demand for each period
2. Determine the capacity for regular time,
overtime, and subcontracting each period
3. Find labor costs, hiring and layoff costs,
and inventory holding costs
4. Consider company policy on workers and
stock levels
5. Develop alternative plans and examine
their total cost
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Roofing Supplier Example 1TABLE 13.2 Monthly Forecasts
MONTHEXPECTED DEMAND
PRODUCTION DAYS
DEMAND PER DAY (COMPUTED)
Jan 900 22
Feb 700 18
Mar 800 21
Apr 1,200 21
May 1,500 22
June 1,100 20
6,200 124
= = 50 units per day6,200
124
Average requirement =
Total expected demand
Number of production days
700/18=39
900/22=41
800/21=38
1200/21=57
1500/22=68
1100/20=55
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Roofing Supplier Example 1Figure 13.3
70 –
60 –
50 –
40 –
30 –
0 –Jan Feb Mar Apr May June = Month
22 18 21 21 22 20 = Number ofworking days
Pro
duct
ion r
ate
per
work
ing d
ay
Level production using average monthly forecast demand
Forecast demand
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Roofing Supplier Example 2TABLE 13.3 Cost Information
Inventory carrying cost $ 5 per unit per month
Subcontracting cost per unit $20 per unit
Average pay rate $10 per hour ($80 per day)
Overtime pay rate$17 per hour
(above 8 hours per day)
Labor-hours to produce a unit 1.6 hours per unit
Cost of increasing daily production rate (hiring and training)
$300 per unit
Cost of decreasing daily production rate (layoffs)
$600 per unit
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© Wiley 2010 37
1. Find the number of workers to produce 50 units per day.
Inventory cost=1850x5=$9250 Wage= 10 x $80 per day x 124 days= $99,200Total cost= $108,450
Num. of workers= 50/5=10 workers
2. Costs involved.
i. Inventory costsii. Wage
1.6hrs=1 unit8hrs = x units?x=8(1)/1.6= 5 units in 8 hrs(a day)
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Roofing Supplier Example 2
MONTHPRODUCTION
DAYS
PRODUCTION AT 50 UNITS
PER DAYDEMAND
FORECAST
MONTHLY INVENTORY
CHANGEENDING
INVENTORY
Jan 22 900 +200 200
Feb 18 700 +200 400
Mar 21 800 +250 650
Apr 21 1,200 –150 500
May 22 1,500 –400 100
June 20 1,100 –100 0
1,850
Total units of inventory carried over from onemonth to the next = 1,850 units
Workforce required to produce 50 units per day = 10 workers
22x50=1100
18x50=900
1050
1050
1100
1000
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Roofing Supplier Example 2
Total units of inventory carried over from onemonth to the next = 1,850 units
Workforce required to produce 50 units per day = 10 workers
COST CALCULATIONS
Inventory carrying $ 9,250 (=1,850 units carried × $5 per unit)
Regular-time labor 99,200 (=10 workers × $80 per day × 124 days)
Other costs (overtime, hiring, layoffs, subcontracting) 0
Total cost $108,450
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Roofing Supplier Example 2
Excess inventory
Reduction of inventory
Cumulative forecast requirements
Cumulative level of production, using average monthly
forecast requirements
6,200 units
Cum
ula
tive
dem
and u
nits
Month
|
Jan|
Feb|
Mar|
Apr|
May|
June
7,000 –
6,000 –
5,000 –
4,000 –
3,000 –
2,000 –
1,000 –
Figure 13.4
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Roofing Supplier Example 3TABLE 13.2 Monthly Forecasts
MONTHEXPECTED DEMAND
PRODUCTION DAYS
DEMAND PER DAY (COMPUTED)
Jan 900 22
Feb 700 18
Mar 800 21
Apr 1,200 21
May 1,500 22
June 1,100 20
6,200 124
700/18=39
900/22=41
800/21=38
1200/21=57
1500/22=68
1100/20=55
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Roofing Supplier Example 3
70 –
60 –
50 –
40 –
30 –
0 –Jan Feb Mar Apr May June = Month
22 18 21 21 22 20 = Number ofworking days
Pro
duct
ion r
ate
per
work
ing d
ay
Level production using lowest
monthly forecast demand
Forecast demand
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© Wiley 2010 43
TABLE 13.3 Cost Information
Inventory carrying cost $ 5 per unit per month
Subcontracting cost per unit $20 per unit
Average pay rate $10 per hour ($80 per day)
Overtime pay rate$17 per hour
(above 8 hours per day)
Labor-hours to produce a unit 1.6 hours per unit
Cost of increasing daily production rate (hiring and training)
$300 per unit
Cost of decreasing daily production rate (layoffs)
$600 per unit
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Roofing Supplier Example 3
COST CALCULATIONS
Regular-time labor
$ 75,392 (=7.6 workers × $80 per day ×124 days)
Subcontracting 29,760 (=1,488 units × $20 per unit)
Total cost $105,152
In-house production = 38 units per day × 124 days
= 4,712 units
Subcontract units = 6,200 – 4,712= 1,488 units
Num. of workers= 38/5=7.6 workers
1.6hrs=1 unit8hrs = x units?x=8(1)/1.6= 5 units in 8 hrs(a day)
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Plan 3
© Wiley 2010 45
TABLE 13.3 Cost Information
Inventory carrying cost $ 5 per unit per month
Subcontracting cost per unit $20 per unit
Average pay rate $10 per hour ($80 per day)
Overtime pay rate$17 per hour
(above 8 hours per day)
Labor-hours to produce a unit 1.6 hours per unit
Cost of increasing daily production rate (hiring and training)
$300 per unit
Cost of decreasing daily production rate (layoffs)
$600 per unit
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Roofing Supplier Example 4TABLE 13.4 Cost Computations for Plan 3
MONTHFORECAST
(UNITS)
DAILY PROD RATE
BASIC PRODUCTION
COST (DEMAND ×1.6 HRS/UNIT ×$10/HR)
EXTRA COST OF INCREASING PRODUCTION (HIRING COST)
EXTRA COST OF DECREASING PRODUCTION
(LAYOFF COST)TOTAL COST
Jan 900 41 $ 14,400 — — $ 14,400
Feb 700 39 11,200 —$1,200 (= 2×$600)
12,400
Mar 800 38 12,800 —$600
(= 1×$600)
13,400
Apr 1,200 57 19,200$5,700 (= 19×$300)
— 24,900
May 1,500 68 24,000$3,300 (= 11×$300)
— 24,300
June 1,100 55 17,600 —$7,800 (= 13×$600)
25,400
$99,200 $9,000 $9,600 $117,800
Basic Production cost= forecast demand x labour hr to produce a unit x pay rate per hour
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Roofing Supplier Example 4
70 –
60 –
50 –
40 –
30 –
0 –Jan Feb Mar Apr May June = Month
22 18 21 21 22 20 = Number ofworking days
Pro
duct
ion r
ate
per
work
ing d
ay
Forecast demand and monthly production
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Comparison of Three PlansTABLE 13.5 Comparison of the Three Plans
COST PLAN 1 PLAN 2 PLAN 3
Inventory carrying $ 9,250 $ 0 $ 0
Regular labor 99,200 75,392 99,200
Overtime labor 0 0 0
Hiring 0 0 9,000
Layoffs 0 0 9,600
Subcontracting 0 29,760 0
Total cost $108,450 $105,152 $117,800
Plan 2 is the lowest-cost option