The data layerTables and columnsInterface tablesIndexesObject type relationships in the Siebel data layerThe business layerBusiness components, joins, and fieldsLinksBusiness objectsRelationships of business layer and data layer objectsThe presentation layerApplets and controlsViewsScreensApplicationsMenus and toolbarsRelationships of presentation layer and business layer objectsThe integration layerInternal integration objectsExternal integration objectsThe automation layerBusiness servicesWorkflow processesTasksCommandsThe logical architecture of Siebel applicationsOther object types