The Working Procedures are available in a PDF document or as a WinZipped Word doc, showing revision marks to the previous version. There is also an html full text version provided

The Working Procedures of 3GPP cover the following areas:

• Description and purpose of the project
• Participation in 3GPP
• 3GPP Structure
• Responsibilities of the groups
• Work Programme and Technical Coordination
• Deliverables
• Reporting
• External Relations

Taken together with the Technical Specification Group working methods (TR21.900) and the Specification drafting rules (TR 21.801) – you have the nearest thing to a rule book in 3GPP.