This chapter is the first one, out of three that focus on opportunities and restrictions for older volunteers from an organisational perspective, based on 73 case studies carried out among European voluntary organisations. The chapter provides the main methodological information about the case study research conducted across the eight countries included in the study. It informs about the main criteria adopted for selecting voluntary organisations, i.e. the activity sector and age-structure of the volunteer workforce. The main characteristics of the voluntary organisations investigated are also shown. After methodological matters, the organisational internal management of older volunteers is analysed in this chapter, in terms of policies, behaviours and attitudes. This has meant to explore organisational age management initiatives regarding volunteers, and also organisational opinions and existing barriers for older volunteers. The study also identifies what type of voluntary organisations could experience more barriers than opportunities for volunteering in older age.