今天上Lean Six Sigma，才发现原来的理解确实有很大的偏差。过去的理解是6σ仅仅是一种评估标准，制造业比较容易应用，软件业似乎仅适用于测试阶段对defect的度量，和production support时对incident的度量。经过今天的介绍，原来6σ是一种象征意义，Lean Six Sigma是一种管理哲学，所象征的是接近于完美的质量要求。意味着100万个出错机会里面只会有3.4个缺陷，也就是99.99966%的质量。它包括一套知道项目管理的方法和工具。
Introduction
Lean Six Sigma是一套基于统计的方法论，换句话说就是number driven，量化所有过程。另外它关注的是Standard Deviation而非Mean(Average)的数值。它有两个目标：一是Reduce Spread（缩小正态分布的跨度），而是Center Process（使正态分布以目标位中心）。以计划的偏差为例，它的目标就是缩小正负偏差的区间，使正负偏差以目标时间为中心分布。
DMAEC：Define, Measure, Analyse, Engineer and Control。
COPQ (Cost of Poor Quality)包括Prevention Costs, Appraisal Costs, Failure Costs and Waste Costs。
Project Charter
- Problem Statement
- Goal Statement
- Business Case
- Project Scope
- Project Milestone
Capture the customer requirements
CTQ: Critical to Customer
VOC: Voice of Customer
Process Mapping
SIPOC: Suppliers, Inputs, Process, Outputs and Customers
Basic Problem Solving Tools
- Brainstorm: No Criticism, Manage Time, Focus on identified issue, prevent bias, etc.
- Fish bone
- Pareto
- XY Matrix: The rows represent the inputs. The columns represent the outputs. And the outputs have the weighting respectively. The cross cells represent the relationship strength of inputs and outputs.
- FMEA: Failure Modes and Effects Analysis