Not a functional resume
Sorry mjd420nova but Toni is not presenting a functional resume. What Toni explained is a project resume - somewhere between a chronological and functional resume
Functional resumes are used when you have so much experience - many employers, projects, positions - that your skills and experience get lost across many pages. Functional resume goes one step higher than project by grouping your skills and experience into functions. For example, in my functional resume, I have project management, technical management, and business analysis.