This book is a study of determinants of eCommerce adoption in small to medium-sized enterprises (SMEs) in New Zealand. The book uses an eCommerce adoption model consisting of different factors which may influence, or hinder, adoption of eCommerce technologies by SMEs in New Zealand. The book uses different methodological approaches to collect data using survey and focus group instruments. The factors included the Chief Executive Officers' (CEO), cost, business size, relative advantage, compatibility of eCommerce with the business, competition, support from technology vendors, information intensity of products, and pressure from suppliers or buyers. This book finds certain factors to contradict previous research findings. These anomalies suggest the uniqueness of the eCommerce adoption context in SMEs in New Zealand.