Each of the certification categories serve a different purpose. The first category “PMO Core Certifications” shows that you have the competencies to design and build a service-orientated PMO with services that are needed by your project community. At the top-level (Expert) certification, you will have to show that you have the competencies to design and build one or more PMOs (called PMO topologies) within an integrated PMO Services topology. The second category of courses, called “Foundational certifications,” comprise of three certifications that are needed by everyone irrespective of whether you are a PMO or project team member or a PM/O director. The foundational courses are the techniques and tools of a trade, so they are needed by everyone including project professionals. The third category of certifications is called the “Specialist” certifications because they directly relate to the ability to offer PMO services. If a PMO service is planned, then the PMO needs to have the capability to offer them. There are over 20 specialist courses at the time of writing. These courses are also needed by project team members.