The growing importance of the third sector is connected, among others, with a change in the scope of its operation, including the performance of public tasks or the increase of its market activity. Becoming part of the civic administration and social service providers, non-governmental organisations are facing the challenges of professionalisation and quality management. Many of them are at the crossroads between traditional thinking derived from the principles of social ethics and alternative thinking focused on modern market processes. The authors of the reviewed publication understand this type of dilemma perfectly. On the one hand, they present the state of modern NGOs on the basis of quantitative and qualitative research, while on the other, by referring to the theoretical foundations and development tools, they indicate directions of organisational changes. The publication covers a wide spectrum of issues related to quality management in a non-governmental organisation, from the issues of professionalisation and development of the organisation, revenue management, motivation conditions, to relationships between organisations within the third sector, and relationships between NGOs and business. The reviewed publication is an excellent guide for both NGOs and their activists as well as for social science students and anyone interested in dynamic changes taking place in the third sector.