Exchange visit scheme. The exchange visit scheme will integrate and complement the other existing mobility opportunities and will be used to ensure connection among network partners for whom contact has not been facilitated via the secondment or training events. This might facilitate the opportunity to contact fellow ESRs with whom specific training activities or network event preparation is planned. The typical duration of an exchange visit is expected to be 1 week. The typical number of exchange visits is expected to range between 2 to 3 per ESR. Exchange visits must be planned and justified in relation to the delivery of their NASSTEC training milestones and approved by the relevant supervisor. Where possible, such visits should be profitably attached to existing scheduled training events, to minimise travelling.