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Operations Management as a Competitive Weapon. Module 3:. Statistical Quality Control. OM Course Framework. 3. Dependability - Project Management - JIT. 1. Cost - Design & Selection. 4. Flexibility - Inventory - Supply Chain - Location - Forecasting - Aggregate Planning.

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Presentation Transcript
om course framework
OM Course Framework

3. Dependability

- Project Management

- JIT

1. Cost

- Design & Selection

4. Flexibility

- Inventory

- Supply Chain

- Location

- Forecasting

- Aggregate Planning

2. Quality

- TQM

- SQC

learning objectives
Learning Objectives

At the end of this module, each student will be able to:

  • Discuss SQC background
  • Discuss SQC types and characteristics
  • Explain Statistical Process Control

Module 03: Statistical Quality Control

1 sqc background
1. SQC Background
  • Involves collecting, organizing, & interpreting data
  • Objective: Regulate product quality
  • Used to
    • Control the process as products are produced
    • Inspect samples of finished products

Module 03: Statistical Quality Control

2 sqc types

Statistical

Quality Control

Process

Acceptance

Control

Sampling

Variables

Attributes

Variables

Attributes

Charts

Charts

2. SQC Types

Module 03: Statistical Quality Control

2 sqc characteristics
Attributes

Characteristics for which you focus on defects

Classify products as either ‘good’ or ‘bad’, or count # defects

e.g., radio works or not

Variables

Characteristics that you measure

e.g., weight, length

Whole number or fractional value

2. SQC Characteristics
3 statistical process control
3. Statistical Process Control

Statistical

Quality Control

Process

Acceptance

Control

Sampling

Variables

Attributes

Variables

Attributes

Charts

Charts

Module 03: Statistical Quality Control

statistical process control spc
Statistical Process Control (SPC)
  • Statistical technique used to ensure process is making product to standard
  • All process are subject to variability
    • Natural causes: Random variations
    • Assignable causes: Correctable problems
      • Machine wear, unskilled workers, poor mat’l
  • Objective: Identify assignable causes

Module 03: Statistical Quality Control

control chart purposes
Control Chart Purposes
  • Show changes in data pattern
    • e.g., trends
  • Show causes of changes in data
    • Assignable causes
    • Natural causes

Module 03: Statistical Quality Control

sqc types
SQC Types

Statistical

Quality Control

Process

Acceptance

Control

Sampling

Variables

Attributes

Variables

Attributes

Charts

Charts

Module 03: Statistical Quality Control

r chart
R Chart
  • Shows sample ranges over time
    • Difference between smallest & largest values in inspection sample
  • Monitors variability in process
  • Example: Weigh samples of coffee & compute ranges of samples; Plot

Module 03: Statistical Quality Control

x chart
X Chart
  • Shows sample means over time
  • Monitors process average
  • Example: Weigh samples of coffee & compute means of samples; Plot

Module 03: Statistical Quality Control

sqc types1
SQC Types

Statistical

Quality Control

Process

Acceptance

Control

Sampling

Variables

Attributes

Variables

Attributes

Charts

Charts

Module 03: Statistical Quality Control

p chart
p Chart
  • Type of attributes control chart
  • Shows % of nonconforming items
  • Example: Count # defective chairs & divide by total chairs inspected; Plot
    • Chair is either defective or not defective

Module 03: Statistical Quality Control

c chart
c Chart
  • Type of attributes control chart
  • Shows number of nonconformities (defects) in a unit
  • Example: Count # defects (scratches, chips etc.) in each chair of a sample of 100 chairs; Plot

Module 03: Statistical Quality Control

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