In the world of software development, one question constantly echoes among technical teams: Scrum or Kanban? This decision can determine not only your team’s efficiency, but also customer satisfaction and the quality of the final product.
Both agile methodologies have proven their value in projects of all kinds, from disruptive startups to multinational corporations. However, choosing the wrong one can turn a promising project into a constant headache.
The key is understanding when and why to use each one.
Scrum and Kanban in a nutshell
Scrum: a way of working that frees up time and effort
Scrum is an agile methodology that organises work into cycles called sprints, typically lasting between one and four weeks.
At the beginning of each sprint, the team commits to a set of features that it plans to complete, creating what is known as the Sprint Goal. During the sprint, the team works autonomously towards this goal, with brief daily meetings (daily standups) to synchronise progress and identify impediments.
At the end of each sprint, the team presents the completed work in a demonstration to the customer or stakeholders (sprint review), followed by a retrospective where they reflect on what worked well and what can be improved. This cycle is repeated continuously, enabling the team to adapt and improve while delivering value incrementally.
When Scrum shines brightest:
- Projects with clear objectives and defined deadlines.
- Teams that need structure and regular meetings.
- Customers who value predictable deliveries.
Kanban: a method with a more flexible philosophy
Kanban is a methodology that functions like a production line where tasks flow through different stages. Typically, the start is “Pending” and the end is “Completed”, passing through intermediate stages such as “In progress” and “Pending review”. Each task is represented by a card that moves across the board as its status progresses.
The key to Kanban is limiting work in progress (WIP limits): you can only have a maximum number of tasks in each column at the same time. This prevents the team from getting overwhelmed and makes bottlenecks visible right away. When a column is full, the team has to clear the blockages before taking on new tasks.
Unlike Scrum, there are no sprints or fixed commitments. When the previous task is completed, the team takes on the next highest priority task as soon as they have the capacity.
When Kanban shines:
- Recurring projects, maintenance projects, or projects with changing requirements.
- Teams that prefer self-management.
- Customers who need quick response to market changes.
Factors to consider when choosing one of them
The decision between Scrum and Kanban should not be based on personal preferences, but on objective criteria that directly impact the success of the project.
Nature of the project
Greenfield projects (new developments):
Scrum is interesting when you build it from scratch. Fixed meetings and events help keep you on track, and sprints help build momentum within the team.
Greenfield projects (new developments):
Kanban handles unexpected interruptions better because there are no sprint commitments to break when a critical bug arises. It allows you to prioritise these issues immediately by simply placing them at the front of the queue, without waiting for the next planning cycle. In addition, it reduces planning overhead by eliminating detailed estimates and planning meetings, allowing the team to focus more on solving problems than on predicting when they will be solved.
Level of uncertainty and changes in requirements
Each methodology makes more sense depending on the degree of unpredictability of the short- and medium-term future. You can use these points as a guide:
High uncertainty → Kanban
Projects are highly uncertain if:
- Requirements change frequently.
- The customer needs to adapt quickly to the market.
- Flexibility is more valuable than predictability.
Stable requirements → Scrum
These are stable requirement projects if:
- Clear and achievable objectives.
- Client committed to the plan.
- Predictability is feasible and important for the business.
Team size and maturity
The equipment, depending on its level of sophistication and size, is also an important factor. Based on these points, each method is more or less suitable:
Small, experienced teams (2–4 developers):
- Kanban leverages your natural autonomy.
- Less management overhead.
- Greater focus on delivery.
Large teams or teams in formation (5+ members):
- Scrum provides the necessary structure.
- Meetings improve communication.
- Defined roles clarify responsibilities.
Preference for timeboxing or continuous flow
This decision often reflects the organisational culture, which may be more oriented towards flexibility or, conversely, greater control over tasks and schedules:
- Timeboxing (Scrum): Scrum’s more rigid scheduling helps create urgency and greater momentum.
- Continuous flow (Kanban): Kanban’s flexibility and self-management make it easier to maintain a sustainable pace.
Asynchrony, nearshore and team coordination
In international projects, you need to consider whether:
- Scrum: Excellent for synchronising teams distributed across different locations but within the same time zone. Ideal for the nearshore model.
- Kanban: Best for teams working in different time zones.
Typical use cases: When is each one appropriate?
Scrum is your best option in these cases:
| Scenario | Why Scrum |
|---|---|
| MVP in a start-up | Sprints create positive pressure to deliver functional features quickly. |
| Project with a fixed deadline | The predictability of Scrum helps meet contractual commitments. |
| New team working together | Ceremonies build cohesion and alignment. |
| Client needs regular demos | Sprint reviews keep the client involved |
| Complex product with multiple stakeholders | The structure helps manage expectations. |
Kanban is your best option if:
| Scenario | Why Kanban |
|---|---|
| Legacy application maintenance | Allows bugs and improvements to be handled without disrupting the flow |
| Technical support team | Ideal for tickets with changing prioritie |
| Research and AI project | Uncertainty requires maximum flexibility |
| Customer with frequent priority changes | No sprint commitment to break |
| Senior, self-organised team | Makes the most of their experience and autonomy |
Comparative table based on characteristics
| Factor | Scrum | Kanban | Hybrid |
|---|---|---|---|
| Project type | Greenfield, MVP, planned evolutionary | Maintenance, support, R&D | Mature products with new features |
| Team size | 5–9 people | 2–6 people | Variable depending on component |
| Team experience | Junior to senior | Senior | Mixed |
| Requirements stability | Medium-high | Low | Variable |
| Need for predictability | High | Low | Medium |
| Overhead aceptable | Medium–high | Low | Medium |
Why not both? Scrumban
The reality is that many mature teams develop a hybrid approach. Scrumban combines the structure of Scrum with the flexibility of Kanban.
A hybrid approach is worth applying in:
- Teams that have outgrown pure Scrum: They have mastered the ceremonies but need more flexibility.
- Multi-phase products: Development (Scrum) + Maintenance (Kanban).
- Sophisticated customers: They understand when they need predictability vs. flexibility.
Choose wisely, our recommendation:
- If in doubt, start with Scrum: It provides structure while your team learns.
- Consider Kanban if your team is very experienced or the project has a high degree of uncertainty.
- Stay open to change: The best methodologies are those that adapt.
Do you need a team with agile methodologies?
Every project is unique, and at Koukio we understand that choosing the right methodology can mean the difference between success and failure. If you are considering a development project and want to ensure you use the most effective approach, let’s talk.
