Are there any project planning tools that can handle an estimate range?
There is also a classic method of giving the best, worst and expected case estimates for each item and then calculating the result
computed_result = (b + 4e + w)/6
You can use this to demonstrate how you derived your grades.
HOWEVER, if you provide a time range; all clients / sponsors / stakeholders will see this lowest value. No, don't say what you say. Therefore, keep the range secret and advertise the calculated result.
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I used Merlin2 which is a project management product for Mac. When you start a new project, it asks for a start date and date, which looks to be corrected, but when you look at the project plan inspector, you see that there is actually an Earliest Date and Last Date for the start and end date, which can be edited. By default, it adds the start date to the Earliest Start Date and the End Date to the Latest End Date — and you can adjust it as needed.
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"Some people suggested that the lower and upper ranges of the expected delivery time should be made when doing the estimate."
But what do your stakeholders want? Will the range help them decide to fund your project?
The ranges are actually not very significant. Also, most people ignore the range and see either low or high numbers. Optimists have happy eyes, see low numbers, and complain when you miss, even if you are under high numbers. Pessimists see a large number, say it is too large, and demand that you reschedule the project to reduce the number.
How - exactly - will the range help you? Who needs a range? What information will help them? What decision should they make that requires a range?
I suggest you plan each part realistically.
Next, indicate the priority of your project. After prioritizing, you will see that there are some essential things, some important but not essential things, and some additional things. This is your range. The cost to do it is low. The cost to make it important, but not essential, is in the middle. The cost of doing extra things is high.
When someone asks you to "reschedule," you cut off the optional material.
This is not a simplified range. This is a realistic view of what you will do and what meaning it has.
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