Project Methodologies
There is no single right way to run a project. The best methodology depends on your project type, team size, and organisational context. Here we break down the four main approaches and help you choose the right one for your situation.
Find My MethodologyEnterprise Ireland Aligned
Hybrid Recommended for Irish SMEsWhy Methodology Matters
Choosing the Right Approach Changes Everything.
A project methodology is the system of principles, practices, and procedures that governs how a project is planned, executed, and controlled. Choosing the wrong methodology — or having no methodology at all — is one of the most common causes of project failure. According to the PMI Pulse of the Profession (2023), organisations that use a defined methodology are 28 percent more likely to meet their original objectives.
No single methodology is right for every project. Waterfall suits projects with fixed, well-understood requirements. Agile suits projects where requirements will evolve. PRINCE2 suits large structured projects requiring formal governance. And Hybrid — the most widely used approach in Irish SMEs and charities — blends elements of multiple methodologies to fit the real-world complexity of most projects.
Conforto et al. (2016) identified that over 85 percent of organisations report using hybrid approaches in practice — combining the structure of traditional methodologies with the flexibility of Agile. For Irish SMEs and charities managing projects with limited resources, evolving funder requirements, and multi-functional teams, a well-designed hybrid approach offers the best of all worlds.
Most Irish SME and charity projects sit in the hybrid zone — structured enough for accountability, flexible enough for reality.
The Four Methodologies
Explore Each Approach.
Click any methodology card to expand the full details, pros, cons, and Irish SME suitability rating.
The Waterfall methodology, first formally described by Royce (1970), follows a strict linear sequence of phases: Requirements → Design → Implementation → Testing → Deployment → Maintenance. Each phase must be fully completed before the next begins, and returning to a previous phase is difficult and costly. Waterfall works best when project requirements are fully known and unlikely to change.
Pros
- ✓Clear structure with defined milestones
- ✓Easy to manage and track progress
- ✓Excellent documentation trail
- ✓Good for funder reporting requirements
- ✓Simple to explain to non-PM stakeholders
Cons
- ✗Highly inflexible to changing requirements
- ✗Testing and issues found late in process
- ✗Client sees deliverable only at end
- ✗Poor fit for innovative or digital projects
- ✗Can be slow and bureaucratic
Royce, W.W. (1970) Managing the Development of Large Software Systems. Proceedings of IEEE WESCON.
Agile project management emerged from the software industry and was formalised in the Agile Manifesto (Beck et al., 2001). Rather than delivering a complete product at the end, Agile works in short cycles called sprints — typically 1–4 weeks — delivering working increments of the project at each stage. Scrum, Kanban, and SAFe are all frameworks built on Agile principles.
Pros
- ✓Highly flexible and adaptive to change
- ✓Regular delivery of working outputs
- ✓Strong stakeholder and client involvement
- ✓Early identification and resolution of problems
- ✓Empowers team members and builds morale
Cons
- ✗Harder to predict final cost and timeline
- ✗Requires experienced, disciplined teams
- ✗Can lose direction without strong product ownership
- ✗Difficult to apply to hardware or construction
- ✗Documentation can be insufficient for audit purposes
Beck, K. et al. (2001) Manifesto for Agile Software Development. Available at: agilemanifesto.org
PRINCE2 (Projects IN Controlled Environments) was developed by the UK government and is now managed by Axelos (2017). It is one of the most widely recognised project management frameworks globally, used in over 50 countries. PRINCE2 is built on 7 principles, 7 themes, and 7 processes — providing a comprehensive, scalable framework for managing complex projects with formal governance requirements.
Pros
- ✓Comprehensive and globally recognised
- ✓Excellent governance and accountability
- ✓Highly scalable to project size
- ✓Clear roles and responsibilities
- ✓Strong risk and quality management
Cons
- ✗Heavy documentation burden
- ✗Can be overkill for small projects
- ✗Requires trained and certified PMs
- ✗Slow to initiate compared to Agile
- ✗Can feel bureaucratic in small teams
Axelos (2017) Managing Successful Projects with PRINCE2. 6th edn. London: TSO.
The Hybrid methodology deliberately combines elements from multiple project management approaches to fit the specific needs of a project or organisation. A typical Irish SME hybrid might use PRINCE2 governance structures for funder reporting and accountability, while using Agile sprint cycles for delivery planning and team management. Research by Conforto et al. (2016) found that hybrid approaches consistently outperform pure methodologies in complex real-world environments.
Pros
- ✓Tailored to your actual project needs
- ✓Balances structure with flexibility
- ✓Works with funders requiring governance
- ✓Adaptable as project context changes
- ✓Most widely used in practice globally
Cons
- ✗Requires experienced PM judgment to design correctly
- ✗Less standardised — harder to train
- ✗Can become inconsistent without clear documentation
- ✗Stakeholders may be unfamiliar with blended approach
Conforto, E.C. et al. (2016) The agility construct on project management theory. International Journal of Project Management, 34(4), pp.660–674.
Side by Side Comparison
How Do They Compare?
Use this comparison table to evaluate which methodology best fits your project context.
| Criteria | Waterfall | Agile | PRINCE2 | Hybrid ★ BEST |
|---|---|---|---|---|
| Flexibility | Low | High | Medium | High |
| Structure | High | Low | Very High | High |
| Documentation | High | Low | Very High | Medium |
| Speed to Start | Fast | Fast | Slow | Fast |
| Best Project Size | Any | Small–Med | Large | Any |
| Funder Reporting | Good | Poor | Excellent | Excellent |
| Team Experience | Low | High | High | Medium |
| Irish SME Fit | ●●●○○ | ●●●●○ | ●●○○○ | ●●●●● |
| Cost Predictability | High | Low | High | Medium |
| Client Involvement | Low | High | Medium | High |
| Change Management | Poor | Excellent | Medium | Good |
| Recommended For | Fixed scope | Digital | Public sector | Most projects ★ |
Find Your Methodology
Which Methodology is Right for You?
Answer five quick questions about your project and we will recommend the best methodology for your situation.
Global Usage Data
How the World Uses Project Methodologies.
Industry data shows a clear global shift toward hybrid and Agile approaches — a trend that reflects the real-world complexity of modern projects.
Individuals and interactions over processes and tools. Working software over comprehensive documentation. Customer collaboration over contract negotiation. Responding to change over following a plan.— The Agile Manifesto, Beck et al. (2001) — the founding principles of modern project management
Watch and Learn
Waterfall vs Agile — Explained Simply.
This short video from Atlassian — one of the world's leading Agile software companies — clearly explains the difference between Waterfall and Agile in a way that applies directly to any Irish organisation.
For a deeper understanding of PRINCE2 visit axelos.com | For the full Agile Manifesto visit agilemanifesto.org
Further Reading and Resources
Go Deeper.
Managing Successful Projects with PRINCE2
Axelos (2017) — the definitive official guide to PRINCE2. Available from the Axelos website and all major academic libraries.
Visit axelos.comThe Agile Manifesto
Beck et al. (2001) — the founding document of Agile project management. Free to read online at agilemanifesto.org — essential reading.
Read the manifestoPMI Pulse of the Profession 2023
Annual global research report on project management trends, methodology adoption, and success factors from the world's leading PM body.
Visit pmi.org