Process Improvement and Quality Management MD707 Operations Management Professor Joy Field
Incremental Improvement and Reengineering The purpose of incremental process improvement and reengineering is to move operations toward the performance frontier by: 1) eliminating non-value added activities and steps in the process and/or, 2) moving to a new performance frontier. • Non-value added activities or steps can be characterized as waste (i.e., no potential to add value) or slack (i.e., resources in excess of what are required to get the job done, including buffers). The concept of “value added” can be thought of in the context of whether a customer would be willing to pay for that activity or step to be performed and/or whether a product or service’s value can be increased through that activity. • Incremental process improvement involves eliminating non-value added activities or steps while leaving the current process essentially intact. • Reengineeringinvolves a fundamental rethinking and radical redesign of processes to improve performance dramatically in terms of cost, quality, service, and speed. Elimination of non-value added activities or steps increases productivity, by definition.
Sources of Non-Value Added Activities • Why do non-value added activities or steps occur in processes? • Poor process and/or organizational design (dysfunctional uncertainty) • Historical artifact • Barriers to learning • Individual • Within group • Across groups • From outside the organization • Finding and correcting errors elsewhere in the process • Unclear understanding of “value” and “risks”
Process Improvement Approach • Discover where non-value added activities are in the process and prioritize improvement efforts: • Flow charts (value stream mapping) • Brainstorming • Data collection • Take action based on the source of the non-value added activity: • Process reviews • Remove barriers to learning • Continuous improvement • Reducing dysfunctional uncertainty • Implementing a systematic approach to process improvement • Increasing process knowledge Reengineering projects often take more of a “clean-slate” approach than incremental process improvement and are typically higher risk and higher return.
Quality as a Competitive Advantage • The costs of poor quality are estimated to be 20% - 30% of product or service costs. • Companies can improve their bottom line through better quality in several ways: • Lower costs • Higher prices • Greater market share • Consistent quality is an order qualifier in many markets • Total Quality Management (TQM) is an approach to quality improvement with the goal of customer satisfaction through continuous improvement and employee involvement.
Quality at the Source • Why? • It costs less. • Inspection and sorting often do not improve process quality. Errors or defects should be caught and corrected at the source, not passed along to an internal or external customer. In other words, “Do It Right the First Time”!
Employee Involvement • This suggest that: • Quality perceptions can be negatively affected at one point in the process, even if the rest of the process is fine. • All employees can participate in improving quality. Employee involvement an important component of TQM because perceived and actual quality is assessed throughout the process, involving all employees.
Work Teams • Work teams are small groups of people who have a common purpose, performance goals, and accountability. • Types of teams • Problem-solving teams • Special-purpose teams • Self-managing teams • How can work teams help improve quality? • Products and services are becoming more complex and interrelated. • Quality can not be ensured by individual efforts alone.
Tools for Organizing Data Analysis • Flowchart • Checklist • Bar chart/Histogram • Pareto chart • Scatter diagram • Cause-and-effect diagram • Control charts
Six Sigma Principles • Six Sigma • Emphasizes the need to recognize high-impact, financially quantifiable opportunities and eliminate defects as defined by customers • Recognizes that variation hinders the ability to reliably deliver high-quality products and services • Requires data-driven decisions using a comprehensive set of quality tools • Provides a highly prescriptive cultural infrastructure for aiding implementation • When implemented correctly, promises and delivers $500,000 of improved operating profit per Black Belt per year • The Define-Measure-Analyze-Improve-Control (DMAIC) improvement process used in Six Sigma is analogous to the PDCA cycle
Six Sigma Organization Roles and Responsibilities Executive Project Member • Own vision, direction, integration, results • Lead change • Part-time • Project-specific Champion All employees Green Belts • Understand vision • Apply concepts • Project owner • Implement solutions • Black Belt managers • Part-time • Help Black Belts Black Belts Master Black Belts • Full-time • Train and coach Black and Green Belts • Statistical problem solving experts • Devote 50%-100% of time to Black Belt activities • Facilitate and practice problem solving • Train and coach Green Belts and project teams
Lean Principles • The lean approach to process improvement includes: • A focus on customers (both internal and external) • Maximizing process velocity (i.e., flow) • Tools focused on analyzing process flow and delay times at each activity in a process • Eliminating waste • Separating “value-add” from “non-value-add” and addressing the root causes of non-value-add activities • Reducing unnecessary complexity and its costs
Lean Six Sigma • Lean Six Sigma combines the emphasis on maximizing flows and reducing waste from Lean with variation reduction and an organizational infrastructure and specific improvement process from Six Sigma. • Lean Six Sigma focuses on improving products and services by addressing poor flow and excess waste and variation in the process.
Lean Six Sigma DMAIC Tools(Lean tools in bold) Define Measure Analyze Improve Control • Project selection tools • PIP management process • Value stream map • Financial analysis • Project charter • Multi-generational plan • Stakeholder analysis • Communication plan • SIPOC map • High-level process map • Non-value-added analysis • VOC and Kano analysis • QFD • RACI and quad charts • Pareto charts • C&E matrix • Fishbone diagrams • Brainstorming • Detailed “As-Is” process maps • Basic statistical tools • Constraint identification • Time trap analysis • Non-value-added analysis • Hypothesis testing • Confidence intervals • FMEA • Simple & multiple regression • ANOVA • Queuing theory • Analytical batch sizing • Brainstorming • Benchmarking • TPM • 5S • Line balancing • Process flow improvement • Replenishment pull • Sales & operations planning • Setup reduction • Generic pull • Kaizen • Poka-yoke • FMEA • Hypothesis testing • Solution selection matrix • “To-Be” process maps • Piloting and simulation • Control charts • Standard operating procedures (SOPs) • Training plan • Communication plan • Implementation plan • Visual process control • Mistake-proofing • Process control plans • Project commissioning • Project replication • Plan-Do-Check-Act cycle • Operational definitions • Data collection plan • Pareto chart • Histogram • Box plot • Statistical sampling • Measurement system analysis • Control charts • Process cycle efficiency • Process sizing • Process capability
Throughput Time and Process Speed Little’s Law: • Throughput time is the amount of time a “unit” (e.g. customer) takes to complete the process • Work-in-process is the number of units in progress • Average completion time is the number of units completed per unit time • If two of the three quantities are known, the other two can be calculated • Increasing process speed requires either reducing the WIP or increasing the completion rate
Cost of Quality Cost categories: There is a tradeoff between quality assurance and nonconformance costs. As the product or service moves farther along in the process, the cost to address a quality problem rises steeply.
Quality Awards and Standards • Awards • Malcolm Baldrige National Quality Award • European Quality Award • Deming Prize • State quality awards • Vendor/supplier quality awards • Standards • ISO 9000/14000