The Unofficial Laws of Project Management
Read Time 8 mins | Written by: Stephen Mertens

Parkinson's Law: The Elasticity of Time
"Work expands to fill the time available for its completion."
Under Parkinson’s Law, if a team is allocated three months to complete a project, the work will take three months to complete – even if it could have been finished in two. This happens because team members may perceive they have more time than needed, pacing themselves accordingly, or padding their estimates to account for unexpected issues.
The negative impact of Parkinson's Law is that it can lead to the misallocation of resources and diminished productivity. Projects may drag on longer than necessary, causing team members to lose momentum and focus. Additionally, prolonged timelines can lead to budget overruns, as fixed costs and resource expenditures accumulate over time
To mitigate the risks associated with Parkinson's Law, PMs should set strict, realistic timelines and establish regular progress check-ins. Clear milestones and deadlines help maintain focus and urgency. Additionally, breaking down large tasks into smaller, more manageable segments can prevent work from unnecessarily expanding to fill the allotted time. Tracking actual time spent on tasks over multiple projects can also provide valuable data for more accurate future estimations. By analyzing this historical data, PMs can refine their duration estimates, setting more realistic timelines that better reflect the true effort required for similar tasks.
Murphy's Law: Preparing for the Unexpected
"Anything that can go wrong will go wrong."
This adage highlights the inevitability of issues and challenges cropping up on all projects – no matter how well-planned. For example, during the development of a new software product, unexpected technical challenges or bugs can arise, causing delays and requiring additional resources to resolve. Murphy's Law emphasizes the importance of planning for risks and being prepared for the unexpected.
The negative impact of Murphy's Law on projects includes potential delays, increased costs, and resource strain. Unanticipated problems can derail even well-planned projects, leading to missed deadlines and budget overruns. Additionally, constant firefighting and dealing with unexpected issues can exhaust project teams, reducing their overall productivity and effectiveness.
To counteract the effects of Murphy's Law, PMs should implement comprehensive risk management strategies. This includes identifying potential risks early, assessing their impact on the project, and developing contingency or mitigation plans. Regularly reviewing and updating these plans ensures that the team can quickly respond to issues as they arise, minimizing disruptions to the project.
Brooks' Law: The Challenges of Scaling Teams
"Adding manpower to a late project makes it later."
Although commonly associated with software development, Brooks' Law can be applied to many projects. Often, adding new personnel to a project can complicate coordination and communication. For instance, in a construction project running behind schedule, adding more workers might initially seem like a solution, but the onboarding and integration process can unintentionally slow progress. This is particularly evident in projects requiring specialized knowledge or tight collaboration.
Brooks' Law highlights how rather than accelerating progress, adding more people can sometimes lead to further delays and decreased productivity – negatively impacting a project’s success. Moreover, the dilution of responsibility and unclear roles can result in decreased accountability, further exacerbating project delays and inefficiencies.
To mitigate these risks inherent in Brooks' Law, PMs should carefully assess the potential benefits and drawbacks of adding new team members. It may be more effective to optimize the productivity of the existing team by identifying and addressing bottlenecks. If additional personnel are necessary, PMs should ensure they are onboarded effectively and with clear communication structures in place to integrate them smoothly into the existing team.
The Pareto Principle: Focus on the Vital Few
"80% of the effects come from 20% of the causes."
Also known as the 80/20 Rule, the Pareto Principle suggests that a small number of tasks or issues typically account for most of a project's impact. For example, in a product development project, a few key features might deliver most of the customer value. Conversely, a few issues, if realized, could be enough to fully derail a project. Recognizing and focusing on these critical tasks (and risks!) can lead to more efficient resource allocation and better project outcomes.
Neglecting the Pareto Principle may lead to resources that are spread too thinly across many tasks, leading to suboptimal results. Projects can suffer from a lack of focus, with significant time and effort wasted on less impactful activities. This scattershot approach not only diminishes the quality of key deliverables but can also overwhelm team members, leading to burnout and decreased overall project performance.
To harness the wisdom of the Pareto Principle effectively, PMs should prioritize tasks that have the most significant impact on project outcomes. This includes identifying mitigation strategies early for high-impact risks that could significantly impact the project’s ability to perform, as well as identifying the most critical tasks early in the project to ensuring that resources are allocated appropriately. Regularly reviewing task prioritization can help maintain focus on what truly matters, leading to more efficient and effective project execution.
The Law of Diminishing Returns: The Limits of Scaling
"After a certain point, adding more resources yields less benefit."
This economic principle applies to project management by highlighting that simply increasing resources—such as staff or funding—does not always lead to proportional increases in output. For instance, doubling the number of workers on a production line might not double the output due to limitations in equipment or workspace.
Ignoring the Law of Diminishing Returns can lead to wasted resources and inefficiency. Overinvesting in resources can lead to diminishing productivity, where the additional input results in increased costs but smaller and smaller gains. This inefficient allocation of resources can also lead to budget overruns and reduced profitability, as the costs of additional inputs outweigh the benefits.
To manage against diminishing marginal returns, PMs should identify the optimal level of resource allocation for each of their projects. This involves analyzing where additional resources are most effective and recognizing the point at which they no longer contribute significantly to project success. By optimizing resource use and avoiding over-allocation, managers can ensure that projects remain cost-effective and efficient.
Goodhart's Law: The Pitfalls of Metrics
"When a measure becomes a target, it ceases to be a good measure."
Goodhart’s Law warns against overreliance on specific metrics. For instance, if a project team focuses solely on meeting a particular deadline, they might compromise on deliverable quality or overlook other important aspects of the task or project. Goodhart’s Law highlights how metrics often drive behavior in unintended ways, such as teams cutting corners to meet identified targets.
Project managers who understand Goodhart's Law understand the danger of narrowly focus on metrics that may not be fully representative of the project's success. Teams might prioritize meeting specific numbers at the expense of quality, innovation, or customer satisfaction. This can lead to a misalignment between the project's goals and the actual outcomes, ultimately diminishing the project's value and stakeholder satisfaction.
Project managers should use metrics as just one of many tools to assess project progress. It's important to consider qualitative measures alongside quantitative metrics and to ensure that metrics reflect a balanced view of project success. At the same time, quantitative metrics should be set thoughtfully, using data to establish achievable targets that will be motivating rather than demoralizing. Encouraging a holistic approach to project evaluation can help teams focus on delivering true value rather than just meeting arbitrary targets.
Conclusion
These unofficial laws of project management offer valuable lessons for managing the complexities and uncertainties of projects. By understanding and applying these principles, PMs can better navigate challenges, manage risks, and lead their teams to success. Whether you're a seasoned professional or new to the field, keeping these laws in mind can help you achieve better project outcomes.
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Stephen Mertens
Stephen Mertens is a Senior Project Manager with a deep understanding of technical project management and resource planning. He has successfully developed and implemented standardized processes that enhance workflow efficiency and accuracy. Stephen’s expertise in managing complex, cross-functional projects has consistently resulted in the successful integration and optimization of project operations.