SelfService Checkout'

1
Self-Service Checkout. Will More Lines Improve
Customer Throughput?
Kevin W. Lewelling Professor Ernesto
Butierrez-Miravete DSES 6620 Simulation
Modeling And Analysis May 1, 2002
2
Current Store Checkout Area Layout
3
Bagging Associate
Full Service Checkout Line Configurations
Unlimited Standard Width
6 ½ ft
Unlimited Handicap Width
7 ft
12 or less Handicap Width
7 ft
12 or less Standard Width
6 ½ ft
Arrival Queue
Checkout Associate
Gathering Area
Service Location
Feeder Conveyor
Exit
Self-Service Checkout Line Configuration
Unlimited or 12 or less
5 ½ ft
Service Location
Exit
Arrival Queue
Gathering Area
Transfer Conveyors
4
Problem Solution Approach
Understand current customer throughput
Collect data
Inter-arrival times Service times Checkout line
configurations
Full-service unlimited Full-service 12
items-or-less Self-service unlimited Self-service
12 items-or-less
Reduce data for analytical representations
Generate simulation models
Run simulation models
Full-service unlimited Full-service 12
items-or-less Self-service unlimited Self-service
12 items-or-less
Evaluate Line Combinations
5
Simulation Runs
20 Iterations each 2 hour warm-up 4 hour run time
6
(No Transcript)
7
Optimization Procedure
Data from Simulation analysis
Solved For
Sequentially Incremented
Given
16
8
Unlimited Item Checkout Lines
Total Customer Throughput for Given Checkout Line
Configurations
Number of Checkout Lines
Total Customer Throughput
Fewer Self-Service Checkout Lines
9
Unlimited Item Checkout Lines
Enlarged Curve
Total Customer Throughput
446
7 Self- Service
Current
426
425
Total Customer Throughput
Fewer Self-Service Checkout Lines
10
12 Items-or-less Checkout Lines
Total Customer Throughput for Given Checkout Line
Configurations
338
298
Current
258
Number of Checkout Lines
Total Customer Throughput
Fewer Self-Service Checkout Lines
11
Conclusions / Recommendations
Self-service lines provide no additional
throughput