The factors to get promotion

• Your communication skills.
  
• Your boasting power and argument skills.
  
• Your manager's communication skills.
  
• Your manager's boasting power and argument skills.
  
• Communication skills of your peers with respect to you.
  
• Boasting power and argument skills of your peers with respect to you.
  
• Communication skills of managers of your peers with respect to your manager.
  
• Boasting power and argument skills of managers of your peers with respect to your manager.
  
• Argument skills of the director who approves the promotions.
  
• The need for the company to give promotion to you.
  

And probably
.....Your contribution to your project with respective to your peers.