Collective dismissal occurs as a result of termination of the employment contract by the employer operated simultaneously or successively within a three-month period of either:

• At least two employees, if the company has fewer than 50 employees;
• At least five employees, it the company has 50 or more employees.

The grounds for collective dismissal which must be demonstrated by the employer are the following:

• market reasons - the reduction of business activity
• structural reasons - economic or  financial unbalance, activity change, restructuring of productive organisation or replacement of dominant products
• technological reasons