Interpersonal skills and business skills both are important to make a good deal.Interpersonal skills are the way to how someone relate and communicate with other.Without interpersonal skill everyday business would be very difficult .For various reasons interpersonal skills are crucial .However knowledge of business principles is also essential .Making a deal requires a great business knowledge and experience .Business deals requires negotiation.Strong skills in negotiation can help to get better deal.It is also important to be able to promote products or services effectively .