What Is a Project Milestone?

How to Track Your Project With Milestones

Planning milestones
Planning milestones. MarcoMarchi/E+/Getty Images

One of the defining characteristics of a project is that they last for a fixed period in time. That could be anything from a few weeks to several years, and in some cases for large-scale construction projects or public works, decades.

In order to track progress along the way and ensure the key deliverables are being achieved according to the timeline, project managers use milestones.

The definition of a project milestone is a task with a duration of zero which signifies an achievement in the project.

They are used as a way showing forward movement and progress and show people what is going on, even if they don’t have a detailed knowledge of the tasks involved to get there. In that respect, they are very useful for stakeholder communication and setting expectations.

In this article we’ll cover everything you need to know about project milestones.

When To Use Project Milestones

Milestones in project management are used to mark:

  • The start of significant phases of work
  • The end of significant phases of work
  • To mark the deadline for something
  • To show when an important decision is being made.

And other fixed points in time that need calling out specifically because milestones are a great way to track your project.

How Frequently To Put Milestones In Your Plan

I was advised on a training course to put milestones in your plan about once a month. This is fine and a good rule of thumb, but you need to use your professional judgement.

Some months might have a lot of activity with important meetings being marked as milestones, decisions being taken and the closure of one phase and the start of another.

In other months you might be focused on execution and there is very little, if anything, that you can hang a milestone on.

Having said that, for reporting purposes it is useful to create a reason to have a milestone at least once in every reporting cycle, and we’ll talk more about milestones and communication in a bit.

How Milestones Are Represented On Your Gantt Chart

Milestones are one of the components of a Gantt chart and are shown on the chart as a diamond. They aren’t shown as a normal task because they have a duration of zero: in other words, they don’t take up any time. For the purposes of planning on a Gantt chart, they just happen!

If you aren’t using Gantt charts you can still use milestones. Here are 5 alternatives to Gantt charts: you can still incorporate milestones into your plan using these.

If you want to stay personally organized and your project management software isn’t fully integrated to your calendar, you can copy and paste the key dates into your diary. Depending on how you like to work this can be a useful tip to remind you of what should be coming up!

How To Name Milestones

Milestones should have a clear description on your project schedule, but not one that implies they are a task. So they shouldn’t be called ‘Get agreement to move into Phase 2’ but ‘Phase 2 starts’. If you want to reflect the effort of getting agreement to move into Phase 2 then add a task in just before that says that.

Milestones should describe the point in time they represent like this:

  • Testing phase complete
  • PID approved
  • Contract signed
  • Town Hall staff meeting

Many project managers choose to number their milestones for ease of reference as well. If you use a work breakdown structure you can use the numbering from that. Otherwise, it’s fine to use M1, M2 and so on to make it clear what you are referring to. A clear naming structure becomes more important the more milestones you have, so think about how you are going to do this if your project runs over several months.

How To Get Milestones Signed Off

Milestones form part of your project schedule so when your schedule is baselined you should consider your milestones signed off.

If you need to change the dates of your milestones then you should use your standard change control procedure for making adjustments to your plan. This might be as easy as chatting to your project sponsor and letting them know why the dates need to change, or as formal as putting together a new recommended schedule and taking it to a planning committee to have ratified.

It’s best to work out what your milestone sign off process will be, if any, prior to needing to use it, so that you don’t waste any time when you have to make a change.

Using Milestones For Communication

Milestones are useful for communication and reporting because they represent the minimum points of control in the plan. In other words, if you took out all the other tasks you could still see what was happening and keep the project moving forward using just the milestones.

You should be able to pull out the milestones and put them in a dashboard or project report. They should tell the story of the project in enough detail to satisfy the people you are reporting to: normally you project sponsor or another executive group such as the steering group (or project board). Each month, or at the reporting frequency you use, you can show which milestones have been achieved.

Reporting against milestones is quite straightforward and is often done as a table. You list the milestone description, the date it was due and then the new forecasted date. When the milestone is achieved and can be marked as complete, you add that date in as well. Hopefully it will be the same as the forecasted date, but projects don’t always work out like that.

A table like this makes it obvious what has been complete and what is outstanding. You’ll be able to plan the answer to the question, “Why didn’t we hit that milestone?” before you go and meet with your sponsor or send the report!

When your project plan is very long and you have lots of milestones you will find it easier to drop off completed milestones each reporting cycle. Only report the milestones that are upcoming or completed that month: next month take off anything that was completed last month so you don’t constantly add to the length of report by telling people about work that they already know is finished.

Milestones are a really useful project management tool for planning, scheduling and reporting and they are easy to use. Put some in your next project plan, track against them and you’ll find yourself learning about what frequency works best for you.

As with everything in project management, use them flexibly to deliver the result you want, using these tips and guidelines to inform your own decisions.