Missing a milestone leads to failure of a project. Milestones can be used to determine the success of your project and super effective way to manage multiple projects at the same time effectively. All milestones should be specific and measurable and they should clearly identify what needs to be achieved . The project lifecycle is most likely subject to change,milestones should be changed accordingly, some milestones may be eliminated, some may be modified and new ones may appear. Milestones are extremely project specific, even if you are doing the same type of projects . Each project has different stakeholders, different clients with different views, and different deliverables in terms of significance . As Milestones helps to measure progress and they must be defined at the start of the project missing it can cause the project get out of control. Without a project milestone tracking we are just monitoring the tasks without following the right path in the project. If you begin missing key milestones, evaluate where the project is falling off course, determine how you can make up ground to get back on track.