individual labour relations (individual labour contract, working time, leaves, labour protection, wages system, labour jurisdiction, legal status of employed woman); collective labour relations (collective negotiation, collective agreement, jurisdiction of collective labour conflicts); legal status of unions and of employers' organizations; social insurance system (pensions, indemnities, unemployment benefits, state allowance); social assistance (material assistance, gratuities); material assistance for deprived persons; aged people, disabled persons, minors and others; problems of employment.