rahul

• Dec 27th, 2005

 

It is a standard used to improve bussiness quality.

The six sigma cycle is Define-->Measure-->Analyse-->Improve and

-- >Control

Neha

• Feb 10th, 2006

 

Six Sigma has now grown beyond defect control. It can be defined as a methodology to manage process variations that cause defects, defined as unacceptable deviation from the mean or target; and to systematically work towards managing variation to eliminate those defects.The objective of Six Sigma is to deliver world-class performance, reliability, and value to the end customer

 

Methodology
Six Sigma has two key methodologies ? DMAIC and DMADV. DMAIC is used to improve an existing business process. DMADV is used to create new product designs or process designs in such a way that it results in a more predictable, mature and defect free performance. Sometimes a DMAIC project may turn into a DFSS project because the process in question requires complete re-design to bring about the desired degree of improvement.

DMAIC
Basic methodology consists of the following five phases:
? Define formally define the process improvement goals that are consistent with customer demands and enterprise strategy.
? Measure to define baseline measurements on current process for future comparison. Map and measure process in question and collect required process data.
? Analyze to verify relationship and causality of factors. What is the relationship? Are there other factors that have not been considered?
? Improve optimize the process based upon the analysis using techniques like Design of Experiments.
? Control setup pilot runs to establish process capability, transition to production and thereafter continuously measure the process and institute control mechanisms to ensure that variances are corrected before they result in defects.

DMADV
Basic methodology consists of the following five phases:
? Define formally define the goals of the design activity that are consistent with customer demands and enterprise strategy.
? Measure identify CTQs, product capabilities, production process capability, risk assessment, etc.
? Analyze develop design alternatives, create high-level design and evaluate design capability to select the best design.
? Design develop detail design, optimize design, and plan for design verification. This phase may require simulations.
? Verify verify design, setup pilot runs, implement production process and handover to process owners. This phase may also require simulations.