ZDCHitsTestTool Node1 ZDCHitsTestTool - m_zdc - m_rpd - m_ZdcID + ZDCHitsTestTool() + initialize() + processEvent() Node2 SimTestToolBase * m_key * SimTestToolBase() * initialize() * getPrimary() Node2->Node1 Node3 SimTestHisto # m_path # m_histSvc + SimTestHisto() + ~SimTestHisto() Node3->Node2 Node4 extends< AthAlgTool, ISimTestTool > Node4->Node2