INFO 463 - Lean Six Sigma Questions and Answers Fully Solved

INFO 463 - Lean Six Sigma

The essential goal of Six Sigma is - answerto eliminate defects and waste, thereby
improving quality and efficiency, by streamlining and improving all business processes.

Six Sigma was first designed for use in - answer1. Manufacturing
2. Practitioners quickly discovered that Six Sigma could be useful and applicable
throughout all aspects of a business - from customer support to management to service
delivery.

What is Six Sigma? - answer1. A Metric - standard deviations in a normal curve

2. A Goal - 3.4 defects per million opportunities

3. A Methodology - DMAIC, a rigorous focused methodology

4. A Management Philosophy

A Metric - answerstandard deviations in a normal curve

A Goal - answer3.4 defects per million opportunities

A Methodology - answerDMAIC, a rigorous focused methodology

What is a Standard Deviation? - answer1. "The standard deviation is the root average
squared deviations of scores from the mean"

2. It is a number that describes how scores in a distribution are spread out from one
another

Standard deviations and defect measurement - answerA defect is any value that falls
outside a customers specifications

Sigma 1 - answerError Free Rate: 30.9%

Defect Rate: 69.1%

Sigma 2 - answerError Free Rate: 69.1%

Defect Rate: 30.9%

Sigma 3 - answerError Free Rate: 93.3%

, Defect Rate: 6.7%

Sigma 4 - answerError Free Rate: 99.38%

Defect Rate: 0.62%

Sigma 5 - answerError Free Rate: 99.977%

Defect Rate: 0.023%

Sigma 6 - answerError Free Rate: 99.9997%

Defect Rate: 0.00034%

Six Sigma has 2 main objectives: - answer1. Center the process to match the target

2. Reduce the variation in the process so the +/- 6 standard variations are between the
upper and lower specification limits

Six Sigma Improvement Methodology - answerDMAIC

1. Define
2. Measure
3. Analyze
4. Improve
5. Control

DMAIC - Define - answerIdentify and state the practical problem

1. Who wants the project and why?
2. What is the scope of the improvement?
3. Who are the key resources for the project?
4. What are the critical milestones?
5. Budget allocation

DMAIC - Measure - answerValidate the practical problem by collecting data

1. Ensure measurement system reliability
---Is tool used to measure output variable flawed?
---Do all operators interpret reading the tool in the same way?

2. Prepare data collection plan
---How many data points are needed?
---How many days to collect data?
---What is the sampling strategy?