WHAT IS A PROJECT TIMELINE?
A project timeline provides the big-picture overview of what an intervention will do and who will be involved. Where a Gantt chart is task-specific and includes particular details relevant to their accomplishment, a project timeline is about quickly summarising and communicating the key stages of a potential solution.
There are a number of ways to present project timelines. Thinking of them as a cross between a timeline (which may or may not include specific dates) and a directional route may be helpful. A project timeline should visually showcase key activities, and how they will build on each other to get to the desired destination. The route (i.e., the order of activities) will depend on their urgency, inter-activity dependencies, resource and personnel availability, and other factors. (Metaphorically, for example, a trip to the gas station may not be particularly scenic, but is going to be a necessary stop during a long journey. Large-scale projects may well require 2-3 gas station detours.)
WHY USE A PROJECT TIMELINE?
A timeline provides an easy-to-read summary of the project, and can be especially useful for external communications.
The process of creating a project timeline is a useful tool for transitioning between program design and project implementation, as having to simplistically represent the order of project activities and describe the intended destination can help ensure that everyone involved in the project has a shared understanding of its trajectory.
Throughout the implementation of project activities, the timeline can serve as a grounding tool and provide direction in the event of roadblocks. If a particular activity looks like it is being 'derailed' (e.g., taking longer than expected, having to be completed with fewer resources than promised, or moving forward without the participation of a key actor), the project timeline can be a useful framework for considering what else might need to change. Responses to project roadblocks might involve trying to get back to the planned route as quickly as possible, or finding a new trajectory to the same final destination.
WHAT ARE SOME LIMITATIONS OF A PROJECT TIMELINE?
It is difficult to foresee the entirety of a project. Reshaping conflict contexts and environmental management, by its very nature, involves creating new territory - and mapping territory that doesn't yet exist is fundamentally a speculative exercise. A timeline is informed by experience and expertise, but involves assumptions about activity outcomes and cause-and-effect relationships that are difficult to fully predict. It is important to understand that additional 'pitstops' may need to be built into the project.
A timeline is a guide, not an absolute manifesto. Project implementation requires flexibility. Timelines are useful tools, but being able to re-route - and communicate the change of direction to everyone involved - is equally important.
Remember: A map is not the territory, and a route is not the journey.