PMZest q68

You are developing your it development project team. some of your team membbers need training on the latet software what you are using. which of the following documents will be the most help in finding out information about the scheduled training for the team members

a) project staff assignments

b) training mgmt plan

c) straffing management plan

d) human resource management plan

answer is : d

PMbok 5 page 266 says that, training needs is in Staffing management plan inside of hr management plan..

so why c is wrong ?