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To be effective, a project plan must be specific and results-oriented. Avoid having an objective that is too vague, for example: "increase vehicle production". Instead, be as specific as possible: "increase vehicle production from 200 to 400 per day in 4 weeks".
Most project plans have a horizontal timeline. Tasks are done in order, one after the other. If you want a PMP that delivers results, however, you need to work on a vertical timeline. This type of organization consists of having several teams working simultaneously on a set of tasks that follow each other in milestones.
Projects that are too long can lead to fatigue and a loss of motivation within the team. The team is then no longer able to perform as well as it did at the start. To be effective, a PMP should not exceed 100 days.
In addition, adapt to the organizational methods of the different stakeholders. Some people like to organize themselves using Gantt charts. Others like to use task lists. Anything is possible, as long as you manage to centralize the management of your project around transversal tools. In this sense, project management software is particularly useful.
Finally, an effective project plan must make your team members accountable. Employees who are responsible for the results produced are more committed to the project and perform better. It is also an excellent way to motivate them.