Start with some basic research The information that can help you estimate how long certain tasks take to complete can come from several sources. More… Find sources for duration estimates -
Your own experience Draw on your own background from times when you carried out similar tasks in this or other projects. -
The experience of your team members Consult with the resources who have been responsible for certain types of tasks. If you already have a team in place, have the members develop their own durations for their assigned tasks on this project. This can serve as a commitment from those who are responsible for completing tasks. -
Previous projects Review projects that you or other project managers built and tracked. Any actual durations that were recorded can be especially helpful. -
Industry standards and benchmarks Find information about task durations that is pertinent to your industry. In books, journals, and on the Web, you can find task lists with recommended durations and other metrics. Professional organizations for your industry are also a good place to find this information. Tip: Consider starting small by creating a project that is broken down into small chunks of work (tasks) that can be completed in a month. When the month's worth of tasks is complete, start another month's worth of work. This is the technique that the agile method of project management uses to help reduce the margin of error in task durations, while providing fast feedback about the health of a project. Build a time buffer into your project Because you can't anticipate every issue that might delay your tasks, even the most accurate durations need a little "wiggle room." This provides a measure of risk management for your project. There are different ways to build a time buffer into your project: -
Add a percentage to every duration If you think a task will realistically take 40 hours to complete, adding a 5% buffer changes it to 42 hours. A 10% buffer changes it to 44 hours. Extra time is built into the schedule, just in case you need it. If you don't need it, this buffer can allow successor tasks to start earlier. -
Add a buffer task Add a modest "buffer task" to every major phase of the project, or a sizable buffer task to the project as a whole. If you find that you need an extra day for a task that is slipping, you can remove the buffer task and add its time to the slipping task. Your overall finish date for the phase or the project remains the same. Create a milestone When you want to identify a significant event in your schedule, such as the completion of a phase, create a milestone in your project. Estimate durations You can model a project by using best-case and worst-case scenarios to help you accurately estimate the durations for your schedule and to simulate future resource loads and their effect on project timelines. Enter a duration After you determine how long it will take to complete a task, it is time to enter a duration. Enter an estimated duration if you still aren't sure how long a task will take to complete. Interrupt work on a task If two tasks occur simultaneously, you can pause the work on the task that starts first, begin the second task, and then start work again on the first task when the second is finished. Create a calendar To identify working and nonworking time for a specific task, create a calendar. For example, a piece of machinery that is needed to complete a task may be available only on certain days of the week. You can identify the working time on a task calendar, and the task is scheduled accordingly. Assign a calendar to a task After you create a task calendar, you apply it to the task or tasks that you created it for. Add supporting information about a task Add more information about a task in the form of notes, documents, and links to Web pages. Click all of the following that apply: |
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