Now that we have a high level estimate and understand more about the variables that contribute to PMO sizing we need to come up with our Secondary Estimate.

The functional categories defined below are defined as general PMO functional areas but you will note there is strong correlation to standard project management methodologies such as PMBOK, CMMi and PRINCE2. 

Whilst the next stage is quite straightforward you should approach the creation of your Secondary Estimate with care and ensure you are calculating your data correctly. The three steps are as follows: 

(1) Apportion your High-Level Estimate to the Lower Level Functional Areas as defined in Table 6 (Column A)
(2) Determine the 'Movement' (Column X) by referencing Table 5 and add this data for each Functional Area; and
(3) Calculate the new FTE estimate for each Functional Area (including the increase/decrease) and then add together to get a new Overall Secondary Estimate for your PMO size. 

To make this process easier to understand I will use use a worked example...