The advancements in the Internet of Things enable a variety of applications that significantly impact our daily lives. Ambient Assisted Living for elderly care is one of the most promising applications that will benefit from the pervasive adoption of devices in everyday life. Although the technological asset is essential, developing applications aiming at improving the living conditions of people by supporting their activities requires considering several other aspects. In particular, the personalisation requirements for specific users and deployment context are crucial, and they can be addressed by favouring a multidisciplinary approach. In this context, this work presents a systematic methodology for addressing user-centred analysis of requirements and early design of AAL applications for elderly care in terms of abstract workflows of services and to personalise them for different end-users and different technological contexts throughout their development cycle, leading to an executable application. The proposed approach allows addressing the needs to manage both technological and human aspects in highly heterogeneous and dynamic environments throughout the development cycle of these applications.