by such means as the accumulation of insurance or employment periods completed under the legislation of each of the Parties.Article 13 of the Revised European Social Charter, which guarantees the right to social and medical assistance, posits that With a view to ensuring the effective exercise of the right to social and medical assistance, the Parties undertake: to ensure that any person who is without 16 Nóra JAKAB the Slovenian and Romanian examples, the region has, thus far, seen no progress. This book does not address migration issues, which are crucial for sustainability, as the population of Central Europe is dying, and migrants are increasingly using the services of the social security system. Finally, long regarded as second-rate rights or disregarded in practice, implemented sparingly, and partly insufficiently backed by active, coherent measures to guarantee their exercise, we believe social rights are reemerging in bad economic times. We agree with Vallasek that the question of social rights is a particularly important topic these days, as global society is facing renewed crises from economic recessions, inflations, the pandemic, and wars. In this context, the issue of sustainability of the social system is a key factor. The issue of social law and social policy can never be considered alone but must be interpreted along with the education, health, labour, and even tax policy of the given state. Thus, the need for a coherent, long-term planned social policy is unequivocal. 10 10 Vallasek, 2023.