In this situation, you should consider what will work best for the project you propose, but also how your decision will influence the diversity aims of the funding scheme. If the Co-I is based outside of Northern America and Western Europe it would be preferable for them to be hosted by an appropriate institution/organisation in that country. As indicated above, you would need a letter of support from this institution/organisation confirming their support of the application. In addition, if the PI host institution is in Northern America or Western Europe, please consider whether it would be beneficial for your team members' career progression if they also had an affiliation (such as Visiting Researcher) with your host institution. We will work with all identified host institutions/organisations (for all proposals) to ensure we are satisfied with their procedures for due diligence and accountability in financial and ethical matters before creating award contracts.