In this publication, the NGMN Alliance builds on its earlier work “6G Use Cases and Analysis” and sets out important aspects for network evolution, considering the opportunities, challenges and design objectives that are intended to guide the broader industry towards delivering services valued by end users. The objectives of this work have been to explore design requirements and provide timely guidance to the industry, to play a key role in avoiding fragmentation of 6G standards and ecosystem to achieve affordable deployments, and to engage with different stakeholders, monitor external 6G activities and facilitate timely exchange with external organisations.