(b)a degree or diploma in social science, [or social work] [ Inserted by G.S.R. 1886, dated 14.12.1965.] or labour welfare [recognised by the Government for the purpose of this rule] [ Substituted by G.S.R. 1886, dated 14.12.1965.] and preferably practical experience of handling labour problems in any industrial undertaking for at least three years; and