What is a project timeline?
Short answer
A project timeline is the project's work laid out in date order: what happens, when it starts, when it is due, and which pieces wait on others. It is usually drawn as a list of dated milestones or as a Gantt chart. To build one, list the work, estimate each piece, order it by dependency, place it on the calendar, and add buffer where a delay would spread.
Last updated 19 October 2026. Written by the Kaneo team, who also build one of the tools mentioned.
Timeline, schedule, and roadmap
| Timeline | Schedule | Roadmap | |
|---|---|---|---|
| Answers | When does each phase of this project happen? | Who does which task on which dates? | What will we build over the next quarters, and why? |
| Detail | Phases and milestones | Individual tasks with owners | Themes and outcomes |
| Audience | Stakeholders and the team | The team doing the work | Leadership, customers, the whole company |
| Changes | When a milestone moves | Weekly or daily | Each planning cycle |
How to build a project timeline
1. Start from the fixed dates
Write down the dates that cannot move: a launch event, a contract end, a regulatory deadline. Everything else is arranged around them.
Use the task breakdown from your project plan. For a timeline you can group tasks into phases; keep the tasks underneath so you can check the phase lengths are real.
3. Estimate durations
Ask the people doing the work, and estimate in working days. Note where an estimate is a guess, because that is where your buffer should go.
Find the tasks that cannot start until others finish. The longest chain of dependent tasks sets the earliest possible end date, which is called the critical path.
5. Place it on the calendar
Account for holidays, people's time off, and the other projects your team is on. A task that takes three days of work rarely finishes three calendar days after it starts.
6. Mark milestones
Add a few checkpoints where something visible is finished: design approved, beta live, launch. Milestones are what you report to people outside the team.
7. Add buffer to the chain, not to every task
Padding every task hides the buffer and it gets used up anyway. A single buffer before the deadline, on the critical path, is easier to protect and to talk about.
Example: a six-week feature launch
| Week | Work | Milestone |
|---|---|---|
| 1 | Research, write the spec, agree scope | Spec approved |
| 2 | Design, start backend work in parallel | Designs approved |
| 3 | Build backend and frontend | |
| 4 | Finish build, write docs, internal testing | Feature complete |
| 5 | Beta with a few customers, fix issues | Beta live |
| 6 | Buffer for fixes, then release and announce | Generally available |
Keeping a timeline honest
Update it when something moves, on the day it moves. A timeline that is two weeks stale is worse than none, because people still make decisions from it.
Watch the critical path, not the whole chart. A task with slack can slip a few days without consequence; a task on the critical path moves the end date with it.
When a date slips, say what will change: the end date, the scope, or the people. Pretending the original date still holds only moves the bad news to later, when there are fewer options.
Building a timeline in Kaneo
Give each task a start date and a due date. In the Tasks view, open Display and choose Gantt to see the work as bars on a shared timeline, or Calendar to review it month by month. Search and filters apply to both, so you can look at one person's or one label's work.
Drag a bar to move a task, or drag either end to change its start or due date. Record order with relations: mark a task as Blocks on the work that has to wait for it.
Kaneo has no separate milestone type. A short task with a due date and a milestone label does the same job, and filtering by that label gives you the stakeholder view of the timeline.
Frequently asked
What should a project timeline include?
The main phases or tasks, their start and end dates, the dependencies between them, a few milestones, and the fixed deadline the project is working towards. For the team, add owners. For stakeholders, the milestones are often enough.
How do you make a project timeline?
Start from fixed dates, list the work, estimate each piece, order it by dependency, place it on the calendar around holidays and other commitments, mark milestones, and add a buffer before the deadline.
Is a Gantt chart the same as a timeline?
A Gantt chart is one way to draw a timeline: tasks as rows, bars across a calendar. A timeline can also be a simple dated list of milestones, which is often clearer for people outside the team.
How detailed should a timeline be?
Detailed enough that each bar has an owner and a clear finish, and no more. For long projects, keep the near weeks detailed and the later months at the level of phases until they get closer.