Business, Projects and Management
Operations, Lean and Six Sigma
Operations is the part of a business that produces and delivers what it sells, day after day, and process improvement is the effort to make that cheaper, faster and more reliable. Lean attacks waste and delay; Six Sigma attacks variation through its define, measure, analyse, improve and control cycle. Supply chain and quality management complete the picture. The methods came from manufacturing and now run in offices, hospitals and software teams.
Why this topic exists: Processes, quality and waste: Lean, Six Sigma's DMAIC and the belts, supply chain and operations management (SFIA Business process improvement; Udemy Operations).
Operations management covers how an organisation turns inputs into the products and services it delivers: capacity, scheduling, inventory, quality and the flow of work between teams. The measures that matter are few and concrete: throughput, lead time, cost per unit, defect rate and on-time delivery. Process improvement is its self-correcting side. SFIA 9 calls the skill business process improvement and lists value stream maps, process maps, root cause analysis and process mining among its methods, with automation and machine learning as newer levers. It does not name Lean or Six Sigma, yet those are the two schools most of the field's vocabulary comes from.
Two schools, one toolbox
| Aspect | Lean | Six Sigma |
|---|---|---|
| Main enemy | Waste and waiting: work that adds nothing the customer values | Variation: outputs that differ when they should be alike |
| Signature method | Value stream mapping, pull, limits on work in progress | DMAIC: define, measure, analyse, improve, control |
| Typical measure | Lead time and flow | Defects and process capability |
| Visual tools | Kanban boards, standard work, 5S | Control charts and capability studies |
| Who practises it | Everyone on the line, through small daily improvements | Trained belts leading data-heavy projects |
Belts, supply chains and systems
Six Sigma credentials come as belts, usually yellow, green and black, but no single body owns them, and syllabus and rigour vary by issuer. A green belt from a provider that demands a completed project with measured results says far more than one earned through an online test. Lean Six Sigma merges the two schools and is the version most offices now encounter. Around the core sit four neighbouring areas.
- Supply chain and logistics. Sourcing, procurement, inventory and delivery: the operations problem once it crosses company boundaries.
- Quality management systems. ISO 9001 and related standards define how an organisation documents and audits its own processes.
- Enterprise systems. ERP platforms such as SAP hold orders, stock and production data, and redesigning a process often means reconfiguring them.
- Change control. An improved process alters how people work, so it needs change control of its own: who approves it, how it is trialled and when it becomes the standard.
The beginner's mistake is starting with the solution. A new tool or an automation is proposed before anyone has measured how the process behaves today, so there is no baseline and no way to show the change helped. DMAIC's first two phases exist to prevent precisely this. A second trap is speeding up one step while the queue simply moves to the next. Improvement also needs the staff who run the process in the room: they know where the delays are, and changes designed without them are the ones that drift back. From here the work connects to organisational change, because improvements fail when people drift back, to agile, Scrum and Kanban in software teams, and to IT service management when the process is a service desk.
Next to this topic
- Project management fundamentalsCharter, scope, schedule, cost, risk and stakeholders: the predictive vocabulary of PMBOK 7's performance domains and the PMP ECO's Process domain, tested by CAPM, PMP, PRINCE2 and IPMA.
- Agile, Scrum and KanbanThree accountabilities, five events, three artefacts and the empirical pillars of the 2020 Scrum Guide; Kanban's flow; the PSM and PSPO exams and PMP's agile half.
- Business analysis and requirementsElicitation, requirements life cycle, strategy analysis, solution evaluation: BABOK v3's six knowledge areas, the discipline between the business and the build (SFIA Change analysis).
- Product managementDiscovery, roadmaps, prioritisation, metrics and the product owner's accountability: where business analysis, agile and strategy meet (Scrum Guide's Product Owner; SFIA Product management; PSPO).
- Organisational change and transformationMaking a change stick in an organisation is its own discipline (SFIA Change planning: organisational change management and enablement; PMBOK's stakeholder and uncertainty domains).
- Leadership and people managementRunning a team: delegation, feedback, performance, hiring, motivation (SFIA People management; PMP's People domain; Udemy's largest business shelf).
- Business strategy and planningBusiness models, competitive position, planning and the numbers behind a decision (SFIA Strategic planning; Udemy Strategy; the business model canvas).
- Entrepreneurship and small businessStarting and running a small business: idea to model, funding, legal basics, first customers (Udemy Entrepreneurship; the site's own small-business and freelance readership).
- Sales and negotiationProspecting, discovery, closing, key accounts and negotiating: the revenue side of every business (Udemy Sales; SFIA Selling).
- Business communication and presentingWriting, presenting, meetings and public speaking: the skill every other business skill is delivered through (Udemy Communication; SFIA Relationships and engagement).
- Freelancing and independent workBriefs, statements of work, day rates, retainers and scope creep: how independent work is scoped, priced and agreed (the site's freelancing concepts and the /freelance/ silo).
Concepts to know
Glossary entries with the reason each one matters here.
- Kanban
Lean's visual control, adopted by software.
- Change Control
Process change needs a process.
Tools of the trade
- SAP
Enterprise resource planning at scale.
Frequently asked
- Is a Six Sigma green belt worth having?
- That depends on the issuer and the job. In manufacturing and operations roles it signals a shared vocabulary, and its value rises sharply when it required a real improvement project. Check what each issuer demanded before comparing two belts.
- Do Lean methods work outside factories?
- Yes, wherever work passes through steps: claims handling, hospital admissions, software delivery. The waste looks different, forms waiting in a queue instead of parts on a shelf, but mapping the flow and removing delays works the same way.
- How do operations and project management differ?
- Operations runs repeating work indefinitely; a project delivers a change and then ends. Improvement initiatives are usually run as projects, which is why project management fundamentals belong in an operations manager's kit.
Courses in the directory
371 courses are filed here; the top 6 by our ranking, details and the provider link on each course page.
Last reviewed 26 September 2026 · Getting Digital