Let's demystify the "missionary call." This thing involves both a subjective inner compulsion but also requires the external validation of the local church. How do you go about evaluating it? Take your time. Get to know your candidate well. Remove the most common and obvious barriers to missionary qualification. Walk with them through the preparation process. In the end, it should be apparent to the whole congregation that God has His hand in leading and equipping on them to to the work of missions.