One-Source Master Notes — compiled for exam-ready mastery with conceptual depth and application precision.
This chapter sits at the intersection of operational strategy and cost management. Every tool here—JIT, Kaizen, 5S, TPM, Six Sigma—is a weapon against waste. The ICAI examiner tests this chapter through case scenarios requiring application (not mere recitation), numerical problems (OEE calculations), and comparative essays (e.g., Kaizen vs Standard Costing; DMAIC vs DMADV).
In the CA Final SCPM syllabus, this chapter directly feeds into Strategic Cost Management (activity elimination, value chain analysis) and Performance Measurement (OEE, process efficiency ratios). Questions from this chapter carry application marks that require structured, structured answers with frameworks.
Traditional manufacturing creates value AND waste simultaneously. Lean thinking forces managers to separate the two — retaining only value-creating activities. The guiding question: "Would the customer pay for this step?" If no → it is waste.
A Lean Manager applies reverse engineering (backward ideology) — starting from what the customer values and tracing backwards to identify what activities to retain vs. eliminate.
CIMA Definition: A system whose objective is to produce or to procure products or components as they are required by a customer or for use, rather than for stock. The JIT system is a Pull system, which responds to demand, in contrast to a push system, in which stocks act as buffers between purchasing, production, and sales.
JIT eliminates: obsolete inventory costs, defective product costs, rework costs, idle asset costs, excess WIP holding costs.
Reduced: material handling, quality inspection, warehouse space, warehouse staff, equipment and rent → sharp drop in overhead cost pool.
Higher quality + reliable delivery → premium pricing possible in quality-sensitive industries.
Kanban Card: A notification card sent upstream to authorise production of just enough components — "pull" from the end of the line.
Cellular Manufacturing: A U-shaped cluster of machines run by a single operator. No WIP can accumulate between machines. Defects identified immediately.
⚡ Both should be used TOGETHER — they are not mutually exclusive.
Concept: No data entry until finished product is completed. At completion, total quantity finished × bill-of-materials components = theoretical inventory usage, which is subtracted from opening inventory.
Used to evaluate whether shifting to JIT is justified:
Only processing time is value-added. Inspection, storage, and moving are non-value-added (waste).
Higher PCE = less waste in the process. JIT typically improves PCE significantly by cutting storage and inspection time.
Standard Costing sets a standard and measures variance. Kaizen assumes the standard itself must keep improving. Nothing is ever perfect — there is always a more efficient way. Kaizen is fundamentally different from BPR (Business Process Re-engineering) which makes radical one-off changes; Kaizen makes small, incremental, continuous improvements sustained over time.
| Dimension | Standard Costing | Kaizen Costing |
|---|---|---|
| Purpose | Cost Control technique | Cost Reduction technique |
| Assumption | Assumes current work conditions remain stable | Assumes continuous improvement conditions |
| Goal | Meet cost performance standards | Achieve cost reduction target |
| Period | Longer (usually annual) | Short — Monthly or Quarterly |
| Variance | Actual vs Standard — variances computed | No formal variance; only the Gap matters |
| Problem Resolution | Variances reported and addressed later | Missing target → root cause assessed (Jidoka etc.) |
| Phase | Japanese Term | English | Core Action | Lean Benefit |
|---|---|---|---|---|
| 1 | Seiri | Sort | Classify materials: Not needed / Needed but not now / Needed but not here / Needed but excess quantity. Use Red Tags (unwanted) and Yellow Tags (needed later). | Eliminates obstacles; prevents accumulation of unnecessary items |
| 2 | Seiton | Set in Order | Systematic arrangement — "a place for everything and everything in its place" (Fayol's 14th Principle). Frequently used items near workstation. | Eliminates search time and motion waste; faster retrieval |
| 3 | Seiso | Shine | Daily cleaning of workstation by worker. Inspect machines from all six sides (front, rear, left, right, top, bottom). | Safer environment; improved quality; less downtime |
| 4 | Seiketsu | Standardise | Establish SMART SOPs so Sort, Set, Shine become habits. Every process must have a standard. | Consistent quality; auditable processes |
| 5 | Shitsuke | Sustain | Daily monitoring, Red Tag Campaign, structured communication, periodic audits, staff recognition, continuous training. | Long-term discipline; self-reinforcing improvement culture |
Plan and Do = Enablers | Check and Act = Results. 5S fits at the Do stage.
Equipment downtime and quality losses are invisible costs that erode profitability. TPM makes every machine defect and breakdown a visible, measurable, and improvable metric. It was first introduced by Nippon Denso Co. Ltd., Japan (a Toyota supplier) and has a goal of Zero Defects, Zero Breakdowns, Zero Accidents.
| Pillar | Focus | Key Technique |
|---|---|---|
| Foundation: 5S | Organised workplace — uncover hidden problems | Seiri, Seiton, Seiso, Seiketsu, Shitsuke |
| P-1: Autonomous Maintenance | Equipment operation without breakdown; defect elimination at source | Cleaning, Lubricating, Visual Inspection, Tightening |
| P-2: Focused Improvement (Kaizen) | Minor continuous improvements to reduce efficiency losses | Kaizen Register, Why-Why Analysis, Summary of Losses |
| P-3: Planned Maintenance | Zero breakdown; optimum maintenance cost | Preventive, Breakdown, Corrective, Maintenance Prevention |
| P-4: Early Management | Shorten product & equipment development time | Engineering & Re-engineering Processes |
| P-5: Quality Maintenance | Customer satisfaction through high-quality products | Root Cause Analysis, Customer Data Analysis |
| P-6: Education & Training | Improve skills and employee morale | Training Calendar, On-site Training Policies |
| P-7: Office TPM | Productivity & efficiency in administration | Process Analysis → Office Automation |
| P-8: Safety, Health & Environment | Zero accidents; zero health damage | Safety Slogans, Dramas, Quizzes, Posters |
| Factor | Formula | What It Captures | Ideal Benchmark |
|---|---|---|---|
| Availability | (Operating Time / Planned Production Time) × 100 |
Unscheduled downtime, breakdowns, setups. Planned downtime (breaks, preventive maintenance) is NOT counted as a loss. | > 90% |
| Performance | (Ideal Cycle Time × Total Count / Operating Time) × 100 |
Speed losses — idling, minor stoppages, reduced speed | > 95% |
| Quality | (Good Count / Total Count) × 100 |
Defects, rework, scrap (also called 'Yield') | > 99% |
Introduced by Bill Smith at Motorola in 1986. Popularised by Jack Welch at General Electric in 1995. In India, Wipro was the first adopter.
Sigma (σ) measures how far a process deviates from perfection. Higher sigma = closer to perfection.
Six Sigma uses three tools together: Quality management methods + Statistical methods + Special infrastructure of people.
| Sigma | DPMO | Defective % | Status |
|---|---|---|---|
| 1σ | 6,91,462 | 69% | Loss |
| 2σ | 3,08,538 | 31% | Non-Competitive |
| 3σ | 66,807 | 6.7% | Average Industries |
| 4σ | 6,210 | 0.62% | Above Average |
| 5σ | 233 | 0.023% | Below Maximum |
| 6σ | 3.4 | 0.00034% | Near Perfection |
| Phase | Action | Key Tools | Indian Banking Example |
|---|---|---|---|
| Define | Define the problem, project goals, and customer requirements | Project Charter, Process Mapping, Tree Diagram, Effort-Impact Analysis | Define why customer satisfaction/loyalty impacts bank performance; gather complaints |
| Measure | Measure current process performance using quantitative data | Quality Function Deployment, Check Sheet, Process Capability Analysis | Measure wait times (highest impact on banking satisfaction) statistically |
| Analyse | Analyse data to find root causes of variation and defects | Histogram, Pareto Diagram, Run Chart, Scatter Graph | Analyse which processes have max impact on satisfaction at minimum improvement cost |
| Improve | Implement solutions to address and eliminate root causes | Advanced statistical tools, design-of-experiments | Corrective measures in consultation with staff; pilot improvements |
| Control | Maintain the improved process; monitor future performance | Control charts, ongoing review systems | Periodic review; if still underperforming → refer back to Define phase |
| Phase | Action |
|---|---|
| Define | Define project goals and customer deliverables |
| Measure | Measure and determine customer needs and specifications |
| Analyse | Analyse process options to meet customer needs |
| Design | Design (detailed) the process to meet customer needs |
| Verify | Verify the design performance and ability to meet customer needs |
| Dimension | DMAIC | DMADV |
|---|---|---|
| Purpose | Fix existing processes | Design new processes/products |
| Approach | Reactive | Proactive |
| Focus | Increase capability | Increase capacity |
| Benefits Timeline | Quantified quickly | Long-term; harder to quantify |
| Indian Example | Reduce cycle time for GST filing; Reduce errors in vendor invoices | Create a new real-time ERP reporting module; Design a new customer onboarding process |
The combination of Lean (speed, waste elimination) and Six Sigma (quality, defect elimination) achieves results neither could attain alone. It enables organisations to: Maximise Profits, Build Better Teams, Minimise Costs, and Satisfy Customers.
Process Innovation: The implementation of a new or significantly improved production or delivery method (including significant changes in techniques, equipment, and/or software).
Changes to processes, equipment, and technology to enhance manufacturing. Includes computer software improvements.
Example: Ford's first moving assembly line — reduced vehicle production from 12.5 hours to 90 minutes.
Tools, techniques, and software solutions for supply chain and delivery systems.
Example: Barcodes, GPS-based tracking systems, shipping software (e.g., Delhivery's routing algorithms).
Innovations in purchasing, maintenance, and accounting processes.
Example: AI-driven invoice processing replacing manual accounts payable workflows in FMCG companies.
| Dimension | BPR (Business Process Re-engineering) | Process Innovation (PI) |
|---|---|---|
| Focus | Amend and streamline existing processes | Implement entirely new processes |
| Scope of Change | Incremental to radical — within existing structure | Changes the overall organisational structure |
| Radicalism | Less radical — streamlines what exists | More radical — redesigns from scratch |
| Example | Adding automated machines to an existing bike assembly line | Giving all parts to a specialist team to manufacture collaboratively (no assembly line) |
| Trigger Phrase / Scenario | Concept to Apply |
|---|---|
| "Excess inventory", "high carrying cost", "demand-driven", "pull system" | JIT (Just-in-Time) |
| "Small incremental improvements", "employee participation in cost setting", "monthly targets" | Kaizen Costing |
| "Workplace disorganisation", "clutter", "search time", "dirty workplace", "old files hiding key files" | 5S Methodology |
| "Machine breakdown", "availability ratio", "performance ratio", "scrap", "OEE" | TPM + OEE Calculation |
| "Defect rate", "customer complaints", "existing process failing", "root cause" | Six Sigma — DMAIC |
| "New process design", "technology changing", "competitor behaviour changing" | Six Sigma — DMADV |
| "Radical redesign", "entirely new process", "from scratch" | Process Innovation |
| "Improve existing", "streamline", "automate" | BPR (vs PI) |
| "Sales returns", "customer feedback", "manufacturing defects by category" | DMAIC Application |
| This Chapter's Concept | Connects To | How They Link |
|---|---|---|
| JIT + Lean | Activity-Based Costing (Ch: Cost Systems) | Both eliminate non-value-added activities; JIT reduces overhead cost pools measured by ABC |
| Kaizen Costing | Target Costing (Strategic Cost Mgmt) | Target costing sets the initial cost ceiling; Kaizen continuously reduces costs towards that target during production |
| TPM + OEE | Performance Measurement (Balanced Scorecard) | OEE is an internal process perspective KPI; directly feeds into BSC's Process dimension |
| Six Sigma | Quality Costing (Cost of Quality) | Six Sigma reduces internal failure costs (rework, scrap) and external failure costs (returns, warranty) |
| Process Innovation | Value Chain Analysis | PI fundamentally redesigns value chain activities; Lean optimises them incrementally |
| 5S | TPM, JIT, TQM | 5S is the foundational platform for all three — the workplace organisation that makes other systems possible |
| Tool | Origin | Primary Goal | Time Horizon | Who Does It | Key Metric | Limitation |
|---|---|---|---|---|---|---|
| Lean System | Toyota, Japan | Eliminate all waste; maximise customer value | Ongoing philosophy | Entire organisation | Process Cycle Efficiency (PCE) | Requires cultural shift |
| JIT | Toyota, Japan | Zero inventory; demand-driven production | Operational (daily) | Supply chain + production | Inventory levels; holding cost | Supply chain vulnerability; demand unpredictability |
| Kaizen | Japan (改善) | Continuous cost reduction | Monthly / Quarterly | All employees (bottom-up) | Kaizen Gap (Actual − Target cost) | Small savings; may miss radical improvements |
| 5S | Japan | Organised, clean, standardised workplace | Daily discipline | All employees | Audit scores; search time | Needs sustained discipline; easy to relapse |
| TPM | Nippon Denso, Japan | Zero breakdowns, defects, accidents | Ongoing | Operators + maintenance staff | OEE (≥85% = world class) | Long time for tangible benefits |
| Six Sigma | Motorola, USA (1986) | Near-zero defects (3.4 DPMO) | Project-based | Trained experts + teams | DPMO; Sigma Level | Quality-focused only; costly infrastructure |
| Process Innovation | Management theory | Implement entirely new processes | Strategic (long-term) | Top management + R&D | Process cost; cycle time | High risk; no guarantee of efficiency gain |
The most complex process in this chapter — how to apply DMAIC step-by-step to a case study.
| 1 | JIT is a Pull system; Traditional is a Push system. Key distinction tested repeatedly. |
| 2 | World-Class OEE = ≥85%. Ideal benchmarks: Availability >90%, Performance >95%, Quality >99%. |
| 3 | Kaizen = cost reduction; Standard Costing = cost control. Never confuse these in answers. |
| 4 | 5S fits in the "Do" stage of PDCA (not Plan, Check, or Act). |
| 5 | Six Sigma = 3.4 DPMO. DMAIC for existing processes. DMADV for new processes. |