What are the advantages and disadvantages of identifying and using general competencies to guide staffing activities?

Here are the ADVANTAGES: 
1. An identified competency can a help a company to focus on the key factors which are needed in all employees in order for them to succeed and be effective in their duties.
2. A competency based approach can help an organisation to enhance its flexibility and responsiveness to environmental changes.
3. The approach can also help to prepare employees to assume a wide variety of responsibilities in their duties.
DISADVANTAGES
1. It may be difficult to identify the most important or critical competency that needs to be considered in a workforce.
2. The process of determining the specific behaviors that reflect each of the identified competency is tedious and time consuming.