In Northern Mexico, The GovLab is working with the five municipal governments (who mayors come from different political parties) to define shared challenges: Hermosillo (812,229 inhabitants) wants to improve the sustainability of its mobility model. Reynosa (pop. 612,183) wants to reduce the daily rate of COVID-19 infections and reactivate the economy.  San Nicolás de los Garza (443,273) wants to improve air quality and the quality of life of the elderly. San Pedro Garza García (122,627) wants help developing more sustainable waste management and addressing the educational digital divide. Finally,Torreon (608,836) wants to find strategies to prevent more cases of COVID-19 and to repopulate its city center. Following eight training sessions for public officials, the GovLab ran an open innovation challenge in October. Over two and a half weeks, residents submitted 237 proposals. Ten winners were selected by peer and expert evaluation. Now we are beginning the coaching program to help cities translate the ten winning proposals into action plans.