diff --git a/carp_core/lib/client/study.dart b/carp_core/lib/client/study.dart
index f02a77406..443809dbe 100644
--- a/carp_core/lib/client/study.dart
+++ b/carp_core/lib/client/study.dart
@@ -63,6 +63,10 @@ enum StudyStatus {
   /// Deployment can complete after all devices have been registered.
   RegisteringDevices,
 
+  /// Device deployment for this primary device has completed,
+  /// but awaiting deployment of other devices in this study deployment.
+  AwaitingOtherDeviceDeployments,
+
   /// Study runtime status when deployment has been successfully completed.
   /// The [PrimaryDeviceDeployment] has been retrieved and all necessary plugins
   /// to execute the study have been loaded.
diff --git a/carp_mobile_sensing/lib/domain/study_protocol.dart b/carp_mobile_sensing/lib/domain/study_protocol.dart
index eb2bac7cb..888d8959a 100644
--- a/carp_mobile_sensing/lib/domain/study_protocol.dart
+++ b/carp_mobile_sensing/lib/domain/study_protocol.dart
@@ -170,20 +170,24 @@ class SmartphoneStudyProtocol extends StudyProtocol
     return true;
   }
 
-  // Add the trigger, task completed, error, and heartbeat measures to the protocol
-  // since CAMS always collects and upload this data from any device.
+  /// Add the trigger, task completed, error, and heartbeat measures to the protocol
+  /// since CAMS always collects and upload this data from any device.
+  /// If the device is a primary device, also add the CompletedAppTask measure.
   void _addSamplingTaskControl(DeviceConfiguration device) {
+    var measures = [
+      Measure(type: CarpDataTypes.ERROR_TYPE_NAME),
+      Measure(type: CarpDataTypes.TRIGGERED_TASK_TYPE_NAME),
+      Measure(type: CarpDataTypes.COMPLETED_TASK_TYPE_NAME),
+      Measure(type: Heartbeat.dataType),
+    ];
+    if (device is PrimaryDeviceConfiguration) {
+      // For primary devices, also add the CompletedAppTask measure
+      measures.add(Measure(type: CompletedAppTask.dataType));
+    }
+
     addTaskControl(
       NoOpTrigger(),
-      BackgroundTask(measures: [
-        // CARP Core measures
-        Measure(type: CarpDataTypes.ERROR_TYPE_NAME),
-        Measure(type: CarpDataTypes.TRIGGERED_TASK_TYPE_NAME),
-        Measure(type: CarpDataTypes.COMPLETED_TASK_TYPE_NAME),
-        // CAMS specific measures
-        Measure(type: Heartbeat.dataType),
-        Measure(type: CompletedAppTask.dataType),
-      ]),
+      BackgroundTask(measures: measures),
       device,
       Control.Start,
     );
diff --git a/packages/carp_movesense_package/lib/movesense_probes.dart b/packages/carp_movesense_package/lib/movesense_probes.dart
index 59755d22d..535976ad7 100644
--- a/packages/carp_movesense_package/lib/movesense_probes.dart
+++ b/packages/carp_movesense_package/lib/movesense_probes.dart
@@ -25,8 +25,10 @@ abstract class _MovesenseStreamProbe extends StreamProbe {
 
   @override
   Stream<Measurement>? get stream => deviceManager.isConnected
-      ? _streamController.stream.map((event) =>
-          Measurement.fromData(_converter.call(jsonDecode(event)) as Data))
+      ? _streamController.stream
+          .map((event) =>
+              Measurement.fromData(_converter.call(jsonDecode(event)) as Data))
+          .skip(10) // skip first 10 measurements to allow sensor to stabilize
       : null;
 
   @override