21 Solutions is a consulting firm active in Belgium, France, and internationally. We specialise in supporting businesses and public authorities in the implementation of environmental and sustainable development initiatives. We thus regularly assist with the application of internationally recognised environmental management systems such as ISO 14001. Additionally, we are increasingly focusing on strategic support for companies and regions in the circular economy. We also support many communities and citizen groups in the fulfilment of their transition projects. We value collective intelligence, appropriation and learning through a practical and concrete approach, as well as the sharing and showcasing of experiences. Our versatile team has developed, tested, and refined a wide variety of techniques and tools, training content and tailored support per business sector. In this context, we have developed simplified, collaborative, and participatory approaches that are adapted to the reality of each organisation.