I didn't say anything about drilling, just that you can have a minimum and maximum range. This can also give you a minimum and a maximum for when the project i

I didn't say anything about drilling, just that you can have a minimum and maximum range. This can also give you a minimum and a maximum for when the project is done. This is actually very useful in large projects, because it lets you identify upfront what are the greatest factor of risks of a project. It didn't want to be a discussion of how management is done, just to highlight that having a time range seems to provide more information to management, which is usually what's desired.