5. Communication. Make sure you keep everyone informed by providing the right information at the right time. Produce status reports and run regular team meetings.Communication is more than just communication in projects, particularly the more complex projects.
The PM/PM office needs to have a very clear appreciation of the information flows and needs of the project, the sources and destinations of information, and what 'meta-information' to keep track of.
Regular systems of meetings are part of the deal, for sure, but they are only hubs in an extensive communication/information network that links the project to its environment, its own performance and its players.
Document management is an important part of this, with currency of documents being tracked to ensure all are using current information.
A project 'data dictionary' to maintain the project's set of definitions and information baseline are important.
If a building/construction project, than a 'BIM' system should be considered, with a system to catalogue and organise the huge flow of information that such projects need.