A project manager launches a software overhaul. Three weeks later, the team discovers that two batches depend on the same developer, who will be unavailable the following month. The schedule goes off track because no one has sequenced the tasks considering the actual dependencies. A sequential plan is precisely the tool that avoids this scenario: it organizes the phases of the project in a logical sequence where each step starts after the previous one has been validated.
Task Dependencies: The Blind Spot of the Sequential Plan
Most planning guides list generic steps (defining objectives, allocating resources, tracking progress). Rarely do we spend time on what truly causes a sequencing failure: the implicit dependencies between tasks.
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Let’s take a project for deploying a new business tool. Team training cannot start until the testing environment is configured. The configuration itself depends on the validation of functional specifications by stakeholders. If we do not map this chain, we accumulate delays at each link.
To formalize these links, we distinguish three types of operational dependencies:
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- Finish-to-start: task B only starts after task A is finished (the most common case in a sequential plan)
- Start-to-start: two tasks start in parallel, but one conditions the launch of the other (server configuration and writing technical documentation, for example)
- Finish-to-finish: two tasks must be completed simultaneously, which requires precise timing of deadlines
Mapping these dependencies before sequencing the phases transforms a theoretical plan into an actionable roadmap. We also identify the critical path, the sequence of tasks where any delay pushes back the final delivery date. To delve deeper into the logic of sequencing phase by phase, detailed examples can be found on the Entrepreneur AZ website for your projects with concrete cases of sequential plans applied to different sectors.
Sequential Plan and Hybrid Approaches: Sequencing Without Locking
A recurring criticism of the sequential plan is that it is too rigid. This argument holds if we oppose sequential planning and agility as two incompatible blocks. In practice, hybrid approaches combine sequencing and short iterations.
The PMBOK 7th edition and recent versions of PRINCE2 formalize this combination under the term tailoring. The idea is simple: we maintain a macro sequencing (successive phases with validation milestones), and within each phase, we work in short sprints to accommodate adjustments.
Breaking Down the Macro into Sequential, the Micro into Iterative
Specifically, we set milestones between major phases (framing, design, implementation, testing, deployment). Each milestone triggers a formal review with stakeholders. Between two milestones, the team operates in short cycles of two to four weeks.
This breakdown resolves a common problem: late feedback that forces a complete phase to be redone. With internal iterations, we detect discrepancies early. The sequential plan retains its function as a backbone, but each phase incorporates feedback loops that reduce the risk of tunnel effect.
Risk Management in a Sequential Plan: Anticipating Blockages
Sequencing tasks is not enough if we do not anticipate what might hinder the chain. A well-constructed sequential plan integrates, at each phase transition, a quick analysis of remaining risks.
Three Recurring Risks in Sequential Planning
The first is the underestimation of the duration of a preceding phase. When the framing phase overruns, all subsequent phases slide mechanically. We often compensate by compressing the testing phase, which degrades the quality of the deliverable.
The second concerns resource availability. In a sequential plan, a key person engaged on another project at the scheduled time creates a bottleneck. Checking the actual availability of resources at each milestone avoids unpleasant surprises.
The third relates to stakeholder validations. Feedback on this point varies by organization, but an absent sponsor or a steering committee that postpones its decisions can block the entire sequencing. Planning buffer times at validation milestones is a simple operational precaution.
Planning Tools: Choosing Based on the Level of Sequencing
Not all tools manage dependencies with the same granularity. A spreadsheet is sufficient for a linear project of five to ten tasks. Beyond that, we need a tool that visualizes the links between tasks and automatically recalculates dates in case of slippage.
- Gantt charts remain the reference format for a sequential plan: each bar represents a task, arrows represent dependencies, and the critical path appears visually
- Kanban boards work better for iterative tracking within a phase, but they do not account for the overall sequencing between phases
- Tools integrating generative AI (Copilot in Planner, Atlassian Intelligence, Notion AI) speed up the drafting of risk matrices and communication plans, with a recognized limitation on the reliability of duration estimates
The choice depends on the complexity of the project. For a simple sequential plan, a shared Gantt chart with the team meets the need. For a multi-team project with cross dependencies, a tool capable of recalculating the critical path in real-time saves considerable time during decision-making.
An effective sequential plan relies less on the number of steps listed than on the quality of the work done beforehand: mapped dependencies, identified risks at each milestone, confirmed resources before launching each phase. Sequencing remains a framework, not a promise. Its value emerges when we use it to ask the right questions at the right time, not to tick boxes in a fixed table.