Go thru; ID Act;
Prior notice indicating the reasons for retrenchment must be given to the employee or wages should be paid for the period of notice in lieu of the notice
The workman should have been paid at the time of retrenchment, compensation equivalent to 15 days average pay for every completed year of service or any part thereof in excess if six months
Notice in the prescribed manner should be given to the appropriate government or to the specified authority by the appropriate government. The authority conducts inquiry and issue order.
If the employer does not comply then the retrenchment will be void ab-initio and the employee would be entitled to all consequential benefits as if there had been no retrenchment.
The employer has to satisfy prescribed conditions: otherwise the retrenchment would become invalid and it would attract penalty u/s 31 (2) of the Act)