LVL1::IgTowerBuilder Node1 LVL1::IgTowerBuilder + BuildEMBgTowers() + BuildTransEMBgTowers() + BuildEMEgTowers() + BuildFwdEMECgTowers() + BuildFCALgTowers() + BuildAllTowers() + BuildSingleTower() + init() + execute() + reset() + interfaceID() Node2 IAlgTool Node2->Node1