The Pursuit of Excellence

Uncontrolled Variation

Uncontrolled Variation

◄ Variation in a Process

Jump to... Jump to... Beadboard Beadboard Help Introduction Available Tools The Specifications Approach The Test / Rework / Scrap Cycle 100% Inspection Is Not Enough Specifications as Goalposts Results Measures vs. Process Measures Moving the Goalposts Variation in a Process Implications of Statistical Control Achieving Control Establishing Control The Empirical Rule A More Relaxed Rule for the Real World The Use of Subgrouped Data The Use of Subgrouped Data (2) The Use of Subgrouped Data (3) Aim & Precision Control Limits & Natural Process Limits A Note about Variable and Attribute Data Defining the Problem Defining the Problem (2) Defining the Problem (3) Attempt 1 The Results of Attempt 1 Attempt 2 Attempt 3 Attempts 4 & 5 Attempt 6 A Different Approach A Different Approach (2) Summary of Results Points to Note Elbow Room Elbow Room (2) Distance to Nearest Specification Limit Capability Indices Capability is not the end of the story The Step Loss Function The Taguchi Loss Function The Taguchi Loss Function (2) On Target With Minimum Variation Adjusting the Process Aim The Western Electric Zone Tests

Implications of Statistical Control ►