In a world of fast changing environments for business, the need for innovation is one of the most stable items. On the other hand, innovation is influenced by more and more factors, like increasing products and service complexity ore growing numbers of partners, involved into a single product innovation. This paper introduces interoperability problems related to simultaneous business and product development.Purpose – This paper introduces the L-modelAgile, an advancement of the V-model. Due to interoperability is essential during the product development process, overall aim of the L-modelAgile is to improve the quality and rate of innovation within complex systems during the early stages of a stable and simultaneously agile innovation process.Design/methodology/approach – The basis of the L-modelAgile consists of the interoperability between the innovation process and the requirements management & engineering process (RM&E process) as well as the agile method Scrum. To link these processes, a best practice model inclusive a capability model and a performance measurement system has been developed. Findings – An increase of innovation quality and innovation speed at complex systems during the early stage of a reliable and simultaneous agile innovation process.Originality/value – The paper focuses on the innovation process during the product development and how to improve its quality.