You are responsible for preparing a cost estimate for a large World Bank project. You decide to prepare a bottom-up estimate because your estimate needs to be as accurate as possible. Your first step is to—

a. Locate a computerized tool to assist in the process

b. Use the cost estimate from a previous project to help you prepare this estimate

c. Identify and estimate the cost for each work package or activity

d. Consult with subject matter experts and use their suggestions as the basis for your estimate