Two research studies conducted over a decade apart discovered that the major sources of conflict within project teams are:
a. Administrative procedures and budget.
b. Human resources and technical opinions.
c. Personalities and cost.
d. Schedules and project priorities.

personalities and cost

Explanation: A project team usually consist of people from different background with different personalities. Man management is one major issue a project manager has to be prepared for. It is for this reason it is pertinent that the team lead or project manager give ample time for team members to bond and know each other very well and also conduct a kick off meeting before the commencement of a project.

it´s related to his charming character.

beauty is not everything, although we can joke that girls only care about the physical or material aspect, the truth is that a real woman looks at more important things, besides intelligence and personality, there are other attitudes that make irresistible to men who are 'unattractive'.

for example develop your sense of humor.

answer; aristotle;