Sumar is advancing in the construction of the new political space, but the process will occur in two phases. The platform led by Yolanda Díaz will hold a first meeting on March 23 that will lay the foundations of the future organization.

In practice it will be provided with a classic structure, with a coordination group - the highest management body between assemblies - that will elect the executive and the coordinator general. The document mentions Izquierda Unida, Catalunya en Comú, Más Madrid, Verdes Equo, Contigo Navarra and the Andalusian People's Initiative as parties involved.