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Project Planning Mistakes: How to Avoid Them
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Project Planning Mistakes: How to Avoid Them

Plan for Success, Not Failure

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PM Toolkit
May 14, 2025
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Project Planning Mistakes: How to Avoid Them
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Ever feel like your project is heading for a bumpy ride, even before it truly begins? The truth is, even with the best intentions, common pitfalls in the early stages of project planning can derail your efforts and lead to significant headaches down the line. In this newsletter, we'll shine a light on ten frequent project planning mistakes and, more importantly, provide actionable insights to help you steer clear of them, ensuring your projects stay on track and achieve their goals.

a man holding a pair of glasses up to his face
Photo by Towfiqu barbhuiya on Unsplash

Ignoring the Foundation: Skipping Essential Early Steps

A strong project is built on a solid foundation. Overlooking crucial initial steps can create cracks that widen as the project progresses.

  • Mistake 1: Unclear Project Goals & Objectives: Without a clear destination, how will you know when you've arrived? Vague goals lead to misaligned efforts and the dreaded scope creep. The project planning best practice here is to employ SMART goals – ensuring they are Specific, Measurable, Achievable, Relevant, and Time-bound. Furthermore, using MoSCoW prioritisation helps you focus on the 'Must have' objectives, preventing less critical tasks from overshadowing the core purpose.

  • Mistake 2: Insufficient Stakeholder Identification & Engagement: Projects aren't solo missions. Failing to identify and understand all key individuals or groups can lead to significant roadblocks. Utilize a Stakeholder Register to map out everyone involved and their interests. If you stick to the end paid subscribers, I’ve included a RASCI chart template to clearly define roles and responsibilities (Responsible, Accountable, Supporting, Consulted, Informed), ensuring everyone knows their part. Lack of early buy-in from stakeholders can derail even the most well-intentioned plans.

  • Mistake 3: Vague or Missing Scope Definition: The high-level scope often resides in the business case, but the devil is in the details. Clearly define the project boundaries and interfaces with adjacent work to prevent overlaps or omissions. Remember, a crucial project planning best practice is to document all assumptions, especially what's not included in the scope (for example, business change activities handled by BAU, specific software customisations, or excluded building work). Incomplete scope is a major culprit in time delays, cost overruns, and benefit erosion.

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Underestimating the Complexity: Poor Planning & Execution

Even seemingly straightforward projects have inherent complexities that demand careful planning and execution.

  • Mistake 4: Inadequate Risk Assessment & Mitigation: Uncertainty is a constant companion in project work. Successful organisations proactively understand potential impacts – both positive opportunities and negative threats. The first critical step is to clearly define the objectives that are ‘at risk’. Translate the organisation's risk appetite into calibrated impact scales (e.g., defining cost impact thresholds). Once these scales are set, you can effectively identify and analyse specific risk events.

  • Mistake 5: Unrealistic Timelines & Resource Allocation: The pressure to deliver quickly can lead to underestimated timelines and poorly allocated resources, ultimately causing more delays and frustration. Employ practical approaches to realistic time estimation, considering task dependencies and resource availability. Ensure that the right people with the right skills are assigned to the right tasks at the right time.

  • Mistake 6: Poor Communication Planning: Lack of clarity in how and when information will be shared can lead to misunderstandings, missed deadlines, and disengaged stakeholders. Develop a comprehensive communication plan that outlines the frequency, channels, and responsibilities for disseminating project information to all relevant parties.

Neglecting the Human Element: Team & Collaboration Issues

Projects are delivered by people, and neglecting team dynamics is a recipe for trouble.

  • Mistake 7: Lack of Clearly Defined Roles & Responsibilities: Ambiguity in who is doing what leads to confusion, duplicated efforts, and a lack of accountability. Reinforce clarity by defining roles and responsibilities, ideally using a RASCI matrix (…keep reading). Foster a sense of individual ownership for assigned tasks.

  • Mistake 8: Ignoring Team Dynamics & Morale: A disengaged or poorly functioning team will struggle to deliver. Remember to understand your team members as individuals – their capabilities, preferences, cultural norms, and social dynamics all play a role. By paying attention to team development and fostering a positive working culture, you significantly increase the chances of high performance and project success.

Failing to Adapt & Learn: Monitoring & Closure Errors

Project management isn't just about the initial plan; it's about adapting and learning throughout the lifecycle.

  • Mistake 9: Insufficient Monitoring & Control: Not tracking progress against your plan is like sailing without a compass. Implement relevant Key Performance Indicators (KPIs) and establish regular progress reporting mechanisms. A key project planning best practice is to have a robust change control process to manage deviations effectively.

  • Mistake 10: Skipping the Post-Project Review: The end of a project is a valuable learning opportunity. Failing to conduct a structured lessons learned session means missing out on insights that can improve future projects. Document best practices, areas for improvement, and actionable recommendations to build organisational knowledge.

Avoiding these common project planning mistakes isn't about achieving perfection; it's about increasing your project's chances of success. By focusing on a strong foundation, realistic planning, effective communication, and a willingness to adapt and learn, you can navigate the complexities of project management with greater confidence.

Stay tuned for our next newsletter, I hope you’re finding this useful! Let me know if you made it to the end by leaving a comment :)

And I almost forgot… the RASCI template.

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