The Grassos practice sharing, and equipping others to share, the gospel intentionally and boldly, primarily using a questionnaire approach, both door-to-door and in the streets. They often, though not exclusively, use Evangelism Explosion training materials. Mark also has developed variety-language tract packs to assist in urban, multi-ethnic settings.
IMPACT Evangelism teams, consisting of both evangelists and regular church members, are recruited by Mark to go to a local church for a week and assist in jump-starting that church's efforts in evangelism. They help emphasize the challenge, train the willing, and IMPACT the immediate church neighborhood, going door to door with questionnaires and other methods as appropriate, and as gifts allow. IMPACT teams have gone to Connecticut, Florida, Georgia, New York, North Carolina, Virginia, and even as far as Nova Scotia, Canada, as well as Pennsylvania. Mark has also joined many similar evangelism teams to New Orleans and the UK, led by Dale Cutlip. Mark coordinates prayer at Christ Church-Yeadon, a reformed mission outpost church in Yeadon, PA. He also leads worship and a discipleship group. All of the Grassos participate in prayer, evangelism, and discipleship as God enables. Mark occasionally helps train other nearby churches in evangelism.