If Simply explains in  business giving credit is the practice to increase sales in volume most occasions for more profitability.

Usually credit appraisal/evaluation form is the key document in many organizations once the sales Representative  suggest the customer or in event of requested by the customer to get credit, forwarding with his recommendation  through the sales manager to the credit  manager for his recommendation or approval to do a sale for credit.

Therefore credit evaluation is a highly recommended option in many occasions according to the main facts such as financial stability & credibility ,repayment capacity,history,ect relevant to the client before giving credit by the credit control manager. 
  
Once the credit is given key factor is the Collection & in general credit control managers responsibilities followed  as below .How ever it change according to the industry & requirement well as strategies & skills.                                                                         Manage the total collection function of all receivables and ensure all overdue amounts from all customers are paid promptly by calling customers and arranging for settlements,  maintaining customer relations and conducting regular field visits.
Plan and implement collection strategies and engage in direct collection of receivables.   
Credit Monitoring:   Perform credit and financial analysis on new and existing customers in order to institute credit limits and terms  Inform and alert Collection Officers of exceptional, problematic or suspicious customers and provide case histories where applicable to minimize bad debt and loss from fraud. 
Manage the daily exceptional usage system and daily court record monitoring system for exceptional reporting and actions taken.       
Manage credit limit system; ensuring limits are set with proper management approval, balancing credit risk and business potential. Maintain  to ensure credit practice is in line with current market practice.    
Manage back end operations to minimize bad debt by dealing with credit suspended accounts tactfully and coordinating collection actions with solicitors & external collection agents.  Manage collection & credit risk of third party  if arrives.  
Manage the collateral (e.g. bank guarantee & cash deposit) and other major accounts. Reporting & Analysis  
Manage annual budget of  aging and bad debt for financial reporting.  
Manage monthly cash flow forecast, bad debt provision and long overdue (> 90 days) analysis.  
People Management  with team members and monitor individual performance.