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Six Sigma vs Agile: Major Differences and what to Choose from?

Updated on 28 July, 2023

12.82K+ views
ā€¢ 7 min read

Six Sigma and Agile are two distinct methodologies employed for project management and process improvement. While they have distinct origins and approaches, both methodologies share common goals of enhancing efficiency, effectiveness, and customer satisfaction.

Agile and Lean Six Sigma are complementary methodologies that can be used together to drive process improvement and project success. Each methodology has its own origins and approaches. Despite their differences, both methodologies share a common goal of improving organizational performance and achieving superior outcomes. 

Six Sigma primarily concentrates on minimizing defects and variations within processes through statistical analysis and measurement techniques. In contrast, Agile emphasizes adaptability, collaboration, and iterative development. Understanding the principles and characteristics of each methodology through Agile Management training courses helps organizations choose the approach that aligns best with their needs.

Six Sigma vs Agile Comparison Table:

The table below shows the difference between Six Sigma and Agile.

Parameters Six Sigma Agile
Basic Concepts Data-driven, structured approach Iterative and incremental approach
Methodology Relies on a set of tools and techniques adaptive methodology that promotes flexibility and collaboration
Scope Process improvement Project management, software development
Process a defined process improvement methodology called DMAIC Iterative and incremental process
Performance Measurement Statistical analysis, process metrics Velocity, burn-down/up charts, feedback
Customer Involvement Voice of the Customer (VOC) Customer collaboration, feedback
Type of Tools Statistical analysis, root cause analysis, process mapping User stories, sprints, retrospectives

Here's a detailed description of each parameter in the comparison table:

Difference Between Six Sigma and Agile

1. Six Sigma vs Agile: Basic Concepts

Lean Six Sigma and Agile are two distinct methodologies with their own basic concepts and principles. Here's an overview of the basic concepts of each methodology:

When comparing Six Sigma vs Agile, it's important to recognize their distinct approaches to process improvement and project management. Six Sigma is a data-driven methodology used to improve processes by reducing defects and variations. It focuses on measuring and analyzing data to identify and eliminate causes of defects, ultimately aiming for near-perfect performance. Six Sigma follows a structured approach and emphasizes process improvement through statistical analysis and the DMAIC (Define, Measure, Analyze, Improve, Control) framework.

Agile is an iterative and incremental approach to project management and software development. It emphasizes flexibility, adaptability, and collaboration. Agile teams work in short iterations called sprints, delivering working increments of the product at the end of each iteration. Agile values individuals and interactions, working software, customer collaboration, and responding to change over following a rigid plan.

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2. Six Sigma vs Agile: Methodology

The difference between Agile and Six Sigma methodologies can be summarized as below:

Six Sigma is a structured methodology that relies on a set of tools and techniques to systematically improve processes. It employs statistical analysis, process mapping, root cause analysis, and other data-driven methods to identify and eliminate defects and improve performance. The DMAIC framework (Define, Measure, Analyze, Improve, Control) is commonly used in Six Sigma projects to guide the improvement process.

Agile, on the other hand, is an adaptive methodology that promotes flexibility and collaboration. It follows the Agile Manifesto and uses frameworks such as Scrum, Kanban, and Lean to manage projects. Agile methodologies focus on iterative development, frequent feedback, and continuous improvement. Agile teams prioritize close collaboration, self-organization, and regular adaptation to changing requirements.

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3. Six Sigma vs Agile: Scope

Six Sigma vs Agile highlights two distinct approaches to process and project management. Six Sigma is often applied to improving existing processes and reducing defects or variations in manufacturing, service delivery, and other operational areas. It aims to achieve significant performance improvements and reduce process variability. Six Sigma projects typically focus on specific processes and their measurable outcomes.

Agile, on the other hand, is commonly used in software development and project management contexts. Its scope extends beyond process improvement to encompass the entire project lifecycle. Agile teams work on delivering incremental value through iterative development, often prioritizing customer requirements and adapting to changes throughout the project. Many organizations invest in Agile Management courses for their employees to enhance their understanding of Agile methodologies and practices and improve project management efficiency.

4. Six Sigma vs Agile: Process

The difference between Agile and Lean Six Sigma processes lies in their approach to project management, problem-solving, and continuous improvement. Below is the sigma vs Agile process:

Six Sigma follows a defined process improvement methodology called DMAIC (Define, Measure, Analyze, Improve, Control).

  • The Define phase is the first step in DMAIC. In this phase, the team defines the problem that they want to solve. They identify the customer who is affected by the problem, and they gather data about the problem.
  • The Measure phase is the second step in DMAIC. In this phase, the team measures the current state of the process. They collect data about the inputs, outputs, and process steps.
  • The Analyze phase is the third step in DMAIC. In this phase, the team analyzes the data that they collected in the Measure phase. They identify the root causes of the problem, and they develop hypotheses about how to improve the process.
  • The Improve phase is the fourth step in DMAIC. In this phase, the team tests their hypotheses and implements changes to the process. They collect data to measure the impact of the changes.
  • The Control phase is the fifth and final step in DMAIC. In this phase, the team implements controls to prevent the problem from recurring. They also monitor the process to ensure that the improvements are sustained.

Agile methodologies typically follow an iterative and incremental process. Teams work in short iterations called sprints to develop and deliver usable increments of the product. Agile projects involve continuous planning, regular feedback and review, and adaptation to changes.

 Agile processes, such as Scrum, involve ceremonies like sprint planning, daily stand-ups, sprint reviews, and retrospectives.

  • Planning: The planning step is where the team defines the scope of the sprint and identifies the work items that need to be completed. The team also estimates the time and resources that will be required to complete the work items.
  • Sprint: The sprint is the short period of time (typically 2-4 weeks) during which the team works to complete the work items that were identified in the planning step. The team meets daily to review progress and identify any challenges that need to be addressed.
  • Review: At the end of each sprint, the team reviews the work that was completed and gathers feedback from customers. The team also discusses any changes that need to be made to the plan for the next sprint.
  • Retrospective: The retrospective is a meeting that the team holds at the end of each sprint to reflect on how the sprint went and to identify areas for improvement. The team discusses what went well, what could have been improved, and what changes they will make for the next sprint.
  • Continuous Integration and Continuous Delivery: It is a set of practices that automate the process of building, testing, and deploying software. It helps to ensure that the software is always in a releasable state and that changes can be made quickly and easily.

5. Six Sigma vs Agile: Performance Measurement

Both 6Sigma vs Agile methodologies have specific approaches to performance measurement:

In Six Sigma, performance measurement relies on statistical analysis and metrics to quantify the process performance and identify areas for improvement. Key performance indicators (KPIs) and process capability indices, such as Sigma levels, are commonly used to measure process performance. The goal is to reduce defects and variations, ultimately improving the overall quality and efficiency of the process.

Agile methodologies emphasize measuring progress and value delivery through working software or product increments. Agile teams use metrics like velocity (the amount of work completed in a sprint), burn-down or burn-up charts (visualizing progress), and customer satisfaction surveys to gauge performance. Continuous feedback and retrospectives help identify areas for improvement and inform future iterations.

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6. Six Sigma vs Agile: Customer Involvement

Six Sigma projects typically involve gathering the voice of the customer (VOC) data to understand customer requirements and expectations. The data then defines critical-to-quality (CTQ) characteristics and aligns process improvements with customer needs.

In Agile, customers or product owners actively participate in Agile ceremonies, including sprint planning, backlog refinement, and sprint reviews. They provide input on prioritizing features, defining user stories, and reviewing the increments delivered at the end of each sprint. When comparing Six Sigma vs Agile, it's clear that both approaches emphasize customer involvement but in different ways, reflecting their unique methodologies for process improvement and project management.

7. Six Sigma vs Agile: Type of Tools

When comparing the difference between Six Sigma and Agile, it's essential to understand their distinct approaches and tools.  Six Sigma utilizes tools such as DMAIC (Define, Measure, Analyze, Improve, Control) methodology, statistical analysis, and process mapping to reduce defects and variations, enhance quality, and drive process improvements. 

Agile employs tools like user stories, scrum boards, and sprint planning to enable iterative development, prioritize customer value, enhance team collaboration, and ensure adaptability in response to changing requirements. Letā€™s explore more about the tools here:

Six Sigma Tools:

  • Process Mapping: Tools like SIPOC (Suppliers, Inputs, Process, Outputs, Customers) and Value Stream Mapping help visualize and understand the process flow.
  • Statistical Process Control (SPC): SPC tools, such as control charts, are used to monitor and control process performance over time.
  • Root Cause Analysis (RCA): Tools like Fishbone Diagrams (also known as Ishikawa or Cause-and-Effect Diagrams) and 5 Whys are used to identify the underlying causes of defects or issues.
  • Statistical Analysis: Tools like hypothesis testing, regression analysis, and design of experiments (DOE) are used to analyze data and make data-driven decisions.
  • DMAIC (Define, Measure, Analyze, Improve, Control): A structured problem-solving methodology used to improve processes.
  • SIPOC Diagram: A tool that maps out Suppliers, Inputs, Process, Outputs, and Customers to understand process flow.
  • Cause-and-Effect (Fishbone) Diagram: Identifies potential causes of problems by categorizing them into key areas.

Tools used in Agile:

  • User Stories: Agile projects use user stories to capture and prioritize user requirements or features.
  • JIRA: A versatile tool for planning, tracking, and managing Agile projects with customizable workflows.
  • Trello: A user-friendly, visual tool for organizing tasks using boards, lists, and cards.
  • Asana: A project management tool that helps teams track work and collaborate effectively.
  • Rally (CA Agile Central): A comprehensive platform for scaling Agile practices across the
  • Kanban Board: A visual board used to track the progress of tasks or user stories through different stages of development.
  • Sprint Planning and Retrospective: Agile frameworks like Scrum have specific meetings and tools for sprint planning and retrospective sessions to plan work and review progress.
  • Burndown Chart: A graphical representation of work remaining versus time, which helps the team track progress and identify any deviations from the planned schedule.
  • Daily Stand-up: A short daily meeting where team members provide updates on their work, discuss any challenges, and synchronize efforts.

How Six Sigma and Agile are Similar?

Six Sigma and Agile are two different approaches used in project management and process improvement, and they have some similarities in terms of their objectives and focus. Below are the similarities:

  • Customer Focus: Both 6 Sigma and Agile methodologies emphasize the importance of understanding and meeting customer requirements. They aim to deliver products or services thus providing value to the customer and meeting their expectations.
  • Data-Driven Decision Making: Both methodologies rely on data and measurements to drive decision-making processes. Six Sigma uses statistical analysis and data-driven tools to identify and address process variations and defects, while Agile employs metrics and feedback to track progress, identify bottlenecks, and improve project outcomes.
  • Continuous Improvement: Both Six Sigma and Agile promote a culture of continuous improvement. Processes are regularly appraised to identify areas for improvement and implement necessary changes to improve efficiency, quality, and customer satisfaction.
  • Collaboration and Teamwork: Both methodologies emphasize collaboration and teamwork. Cross-functional teams are encouraged to work together, share knowledge and expertise, and collaborate to achieve project goals. In Six Sigma, this is often facilitated through the use of improvement teams, while Agile promotes self-organizing and collaborative teams. 
  • Incremental Approach: While Six Sigma typically focuses on making incremental improvements to existing processes, Agile follows an incremental and iterative approach to software development and project management. Both methodologies recognize the benefits of breaking down complex tasks into smaller, manageable components, which allows for faster feedback, learning, and adaptation.

What Should You Choose Between Six Sigma and Agile?

Before choosing between the two methodologies, one must consider the key differences between Six sigma and Agile. Some key factors to consider are:

  • Project Scope: Consider the nature of your project. If you are primarily focused on process improvement, reducing defects, and optimizing efficiency, Six Sigma may be a more suitable choice. Agile is better suited for software development or projects requiring flexibility, adaptability, and customer-centricity.
  • Customer Requirements: If customer satisfaction and delivery value are critical, Agile's customer-centric approach and iterative development cycles may be advantageous. However, if your project primarily aims to meet quality standards and reduce process variations, Six Sigma's data-driven approach can help you achieve those goals.
  • Team and Organizational Culture: Based on the organization's culture and focus area, a decision can be taken to choose either Agile or Six Sigma methodologies. 
  • Project Complexity and Uncertainty: Agile methodologies, with their iterative and incremental approach, are well-suited for projects with evolving requirements and a dynamic environment. Six Sigma, on the other hand, is more suitable for projects where the processes and requirements are relatively stable, and the focus is on achieving consistent quality.
  • Project Timeline: Agile methodologies offer the advantage of delivering working increments at regular intervals, allowing for early feedback and value realization. Six Sigma projects typically involve more extensive data collection and analysis, which may take longer to complete.

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How to Make Six Sigma and Agile Work Together?

When considering the Six Sigma and Agile differences, it's clear that when these methodologies are used together, the team can leverage the strengths of both. Agile's focus on collaboration and flexibility can help the team to quickly adapt to change, while Six Sigma's focus on quality can help the team to reduce defects and variation. To enhance your team's Agile knowledge and provide them with recognized credentials consider enrolling your team in Agile training courses and certifications offered by reputable training providers like KnowledgeHut Agile Management training courses

Conclusion

Agile and Six Sigma offer distinct yet valuable methodologies for project management and process improvement, each catering to different project contexts and goals. Agile's flexibility and iterative nature make it ideal for dynamic environments, excelling in fostering collaboration, adaptability, and delivering value early and frequently. By prioritizing customer satisfaction and teamwork, Agile promotes efficient, customer-centric project delivery. Six Sigma's data-driven approach offers a systematic framework for reducing defects, minimizing variability, and enhancing process efficiency. With its structured problem-solving and emphasis on data analysis, Six Sigma helps organizations achieve consistent quality and optimize performance. 

The choice between Agile and Six Sigma depends on the specific needs of the organization or project. Understanding the nuances of each approach enables informed decisions to enhance outcomes and drive continuous improvement.

Frequently Asked Questions (FAQs)

1. Is Six Sigma considered Agile?

No, Six Sigma is not considered Agile. While both Six Sigma and Agile methodologies aim to improve processes and achieve better outcomes, they have distinct approaches and principles.

2. What is Sigma in agile?

The term "Sigma" is used informally in Agile contexts to refer to the concept of measuring and improving team performance or process capability.

3. Which is the highest level in Six Sigma?

The highest level in Six Sigma is often called "Six Sigma Level" or "Six Sigma Performance." It represents a quality goal where the process aims to achieve a defect rate of 3.4 defects per million opportunities (DPMO), which corresponds to a Sigma level of 6.