PRINCIPLE: Strike is a collective stoppage of work by workmen undertaken in order to bring pressure upon those who depend on the sale or use of the products of work; whereas, lock-out is a weapon in the hands of the employer, similar to that of strike in the armoury of workmen, used for compelling persons employed by him to accept his terms or conditions of or affecting employment. While in closure there is permanent closing down of a place of employment or part thereof, in lay-off an employer, who is willing to employ, fails or refuses or is unable to provide employment for reasons beyond his control. FACTS: Workmen of a textile factory went on strike as per law, demanding the payment of bonus. Employer of the factory refused to pay any extra allowances, including bonus, and besides he closed down the factory till the strike was stopped.