This issue of the quarterly journal "Capacity.org" focuses on methods that can help to understand the societal context in which capacity development takes place. One of these methods is systems thinking, in which organisations, sectors and societies are seen as systems composed of elements that interact with each other. 

The quality of rural extension and advisory services is a crucial element in fostering innovation and rural development. This article aims to clarify the concept of quality of rural extension and to develop a preliminary theoretical framework. An ample literature review was conducted in search of articles on service quality and quality of rural extension and advisory services. The first part presents the main results of the literature search on quality of extension services. The definition of quality is not universal.