A number of approaches can be helpful when estimating resource requirements for activities on a project. Assume you are managing a project and you have already prepared your WBS. When you decomposed your WBS, it has 45 work packages. You then
prepared an activity list. Now, you are preparing your schedule and determining your resource requirements. You found there were about 30 activities that you could not estimate with a reasonable degree of confidence, so you and your team decided to use which
one of the following approaches to help with these activity resource estimates:


A. Resource breakdown structure
B. Published estimating data
C. Alternatives analysis
D. Bottom-up estimating