Industrial Disputes Act,1947 – Section 2(s) –The determinative factor for “workman” covered under section 2(s) of the I.D. Act, is the principal duties and functions performed by an employee in the establishment and not merely the designation of his post. Further, the onus of proving the nature of employment rests on the person claiming to be a “workman” within the definition of section 2(s) of the I.D. Act (Para 15) [Allowing appeal, SC observed: Applying the pre-amended provision of section 2(s), since the employee was terminated from service and was drawing salary of more than Rs.1,600/-, he does not come within the definition of “workman”. Therefore, we hold that the employee is not a “workman” as defined under section 2(s) and is not covered by the provisions of the I.D. Act. ]