Effective project management as per PMBOK requires that the project management team understand and use knowledge and skills from the following areas:
- The Project Management Body of Knowledge
- Application area knowledge, standards, and regulations
- Understanding the project environment
- General management knowledge and skills
- Interpersonal skills.
Looking at the above areas if one has very good Interpersonal skills (Effective communication, Influencing the organization, Leadership, Motivation, Negotiation and conflict management, Problem solving etc) than it should not be difficult for him to master the other areas.