Regarding resumes

So I’m putting together a resume. I’ve researched and utilized a variety of resources (many of them here) to put a simple, clean and informative resume together. However, I still have a question:

I’ve worked for IBM for 7 years now, but have held two distinct positions at the same project (one technical management, the other a sort of project office/administrative position). Do I list those positions separately under experience, or combine them into one listing?

Feedback appreciated, folks. Thanks in advance.