Purpose: This article sheds light onto the increasing problem of product returns, which is exacerbated by growing e-commerce. Many retailers and academics are oblivious to the nature and scale of this challenge. Interdisciplinary research is needed to develop supporting theory, and cross-functional teams are required to implement measures addressing economic, ecological and social sustainability issues.Design/methodology/approach: The initial project adopted a multi-case study approach, whereby returns processes were mapped, vulnerabilities identified and a returns cost calculator was developed.Findings: Product returns processes are usually complicated, prone to internal and external fraud, inefficient and lack sustainability. They can generate considerable losses to the business, especially as returns data are often not systematically collected, monitored or reported to senior management. There are important implications for strategic and operational management, namely the need to develop a concept for Lean returns systems.Originality/value: Product returns are a unique and understudied but growing field in academic research, with only few publications over the last two decades. Yet the phenomenon is causing increasing problems in business and society. Robust solutions could achieve great financial and non-financial impacts.

Product returns in retail are inherently wasteful and have considerable negative environmental impacts. Besides the monetary costs, they lead to increased transportation, packaging and processing, and the returned items are often discarded. We present strategies and practices retailers can adopt to manage their product returns in a way that reduces environmental impacts. With eCommerce flourishing, product returns have increased significantly. Whilst highest for online sales, they are a challenge across all channels. The importance of developing sustainability management in operations and supply chains is evident from the growing body of literature, but there is a gap regarding the management of product returns in a more environmentally sustainable manner. To address this gap, we interviewed multichannel retailers, retail experts and return service providers operating in the UK and North America. The findings reveal that although retailers have started paying attention to the financial impact of returns, there is little awareness of the scale of environmental impacts. In addition, retailers lack a comprehensive approach to addressing the environmental impact of product returns. Based on our findings, we (1) unpack the barriers inhibiting retailers from developing environmental sustainability plans in returns management, (2) present a set of strategies for retailers to reduce the environmental impact of returns and (3) develop a framework for environmental sustainability in returns management. Our findings and proposed framework have implications for research and practice on addressing the environmental impact of product returns.

Complexity science has seen increasing interest in the recent years. Many engineers have discovered that traditional methods come to their limits when coping with complex adaptive systems or autonomous agents. To find alternatives, complexity science can be applied to engineering, resulting in a quickly growing field, referred to as complexity engineering. Most current efforts come either from scientists who are interested in bio-inspired methods and working in computer science or mobile robots, or they come from the area of systems engineering. This article reviews the definitions of the most important concepts such as emergence and self-organisation from an engineer's perspective, and analyses different types of nature-inspired technology. This is the first part of a set of two-articles on this topic; the second one provides a survey of currently existing approaches to complexity engineering, identifies challenges and gives directions for further research.