Notice of strike procedure requires Form-XI, proper signatures, and timely electronic intimation to labour authorities. Notice of strike under the Industrial Relations (Central) Rules, 2026 must be issued in Form-XI to the employer and signed by the Secretary of the registered Trade Union or, where there is no registered union, by five elected worker representatives. Copies must also be sent electronically or by speed post to the conciliation officer, Chief Labour Commissioner (Central), and the Secretary, Ministry of Labour and Employment. The date of receipt of the notice is the relevant date for the statutory requirement, and an employer receiving a strike notice must intimate it electronically within five days.