Common Project Manager Mistakes

A short list of the potential problems resulting from inadequate stakeholder identification and analysis include:

• Increased project risk in the form of unknown unknowns that unpredictably manifest as surprises throughout the project life cycle.
• Increased demands from senior management stakeholders for frequent and detailed project progress and status information.
• Delivering a “successful failure.” By this I mean, delivering on the known and agreed requirements without recognition that those requirements did not include input from important (unknown) stakeholder constituencies.
• Reduced ability to effectively anticipate and manage stakeholder expectations.
• Increased scope instability and frequent change control challenges.

Source: http://blog.globalknowledge.com/certification/common-project-manager-mistakes-1-limiting-stakeholders