diff --git a/designer_v2/lib/common_views/utils.dart b/designer_v2/lib/common_views/utils.dart
index dff1af1e5..2c729e3fd 100644
--- a/designer_v2/lib/common_views/utils.dart
+++ b/designer_v2/lib/common_views/utils.dart
@@ -1,4 +1,6 @@
-import 'package:flutter/widgets.dart';
+import 'package:flutter/material.dart';
+import 'package:studyu_designer_v2/theme.dart';
+import 'package:studyu_designer_v2/utils/extensions.dart';
 
 typedef WidgetDecorator = Widget Function(Widget widget);
 
@@ -43,3 +45,18 @@ extension ColorX on Color {
     return withAlpha((alphaScaleFactor * alpha).round());
   }
 }
+
+Widget interventionPrefix(int rowIdx, BuildContext context) {
+  final theme = Theme.of(context);
+  return Row(
+    children: [
+      Text(
+        ''.alphabetLetterFrom(rowIdx).toUpperCase(),
+        style: TextStyle(
+          color: ThemeConfig.dropdownMenuItemTheme(theme).iconTheme!.color,
+        ),
+      ),
+      const SizedBox(width: 16.0),
+    ],
+  );
+}
diff --git a/designer_v2/lib/constants.dart b/designer_v2/lib/constants.dart
index f84ac181e..7e484948f 100644
--- a/designer_v2/lib/constants.dart
+++ b/designer_v2/lib/constants.dart
@@ -19,6 +19,9 @@ class Config {
   static const minSplashTime = 0;
 
   static const formAutosaveDebounce = 1000;
+
+  static const participantDropoutDuration = 5;
+  static const participantInactiveDuration = 3;
 }
 
 const kPathSeparator = '   /   ';
@@ -46,5 +49,3 @@ const String signupRouteName = 'signup';
 const String forgotPasswordRouteName = 'forgotPassword';
 const String recoverPasswordRouteName = 'recoverPassword';
 const String errorRouteName = 'error';
-const participantDropoutDuration = 5;
-const participantInactiveDuration = 3;
diff --git a/designer_v2/lib/domain/study_monitoring.dart b/designer_v2/lib/domain/study_monitoring.dart
index 51b9e192c..e80d27c7c 100644
--- a/designer_v2/lib/domain/study_monitoring.dart
+++ b/designer_v2/lib/domain/study_monitoring.dart
@@ -1,39 +1,12 @@
 import 'dart:math';
 
+import 'package:collection/collection.dart';
 import 'package:equatable/equatable.dart';
 import 'package:studyu_core/core.dart';
 import 'package:studyu_designer_v2/constants.dart';
 
-class StudyMonitorData {
-  /// Number of participants who are currently active in the study
-  /// Active means that the the study has not ended yet and the participant did not drop out
-  final int activeParticipants;
-
-  // Number of participants who are currently inactive in the study for more than 3 days in a row
-  final int inactiveParticipants;
-
-  /// Number of participants who dropped out of the study before the study ended
-  /// Hint: The is_deleted flag in the study_subject database table marks a participant as dropped out
-  /// Note: If the participant's last activity exceeds 7 days, they will also be counted as a dropout
-  final int dropoutParticipants;
-
-  /// Number of participants who completed the study
-  /// Completed means that the participant has reached the end of the study
-  final int completedParticipants;
-
-  /// List of all participants with their monitoring data
-  final List<StudyMonitorItem> items;
-
-  const StudyMonitorData({
-    required this.activeParticipants,
-    required this.inactiveParticipants,
-    required this.dropoutParticipants,
-    required this.completedParticipants,
-    required this.items,
-  });
-}
-
 class StudyMonitorItem extends Equatable {
+  final StudySubject studySubject;
   final String participantId;
   final String? inviteCode;
   final DateTime startedAt;
@@ -49,6 +22,7 @@ class StudyMonitorItem extends Equatable {
   final List<Set<String>> completedTasksPerDay;
 
   const StudyMonitorItem({
+    required this.studySubject,
     required this.participantId,
     required this.inviteCode,
     required this.startedAt,
@@ -70,7 +44,7 @@ class StudyMonitorItem extends Equatable {
 }
 
 extension StudyMonitoringX on Study {
-  StudyMonitorData get monitorData {
+  List<StudyMonitorItem> get monitorData {
     final List<StudyMonitorItem> items = [];
 
     final participants = this.participants ?? [];
@@ -158,6 +132,7 @@ extension StudyMonitoringX on Study {
 
       items.add(
         StudyMonitorItem(
+          studySubject: participant,
           participantId: participant.id,
           inviteCode: participant.inviteCode,
           startedAt: participant.startedAt!,
@@ -175,50 +150,59 @@ extension StudyMonitoringX on Study {
       );
     }
 
-    int activeParticipants = 0;
-    int inactiveParticipants = 0;
-    int dropoutParticipants = 0;
-    int completedParticipants = 0;
-
-    final participantInactiveDays = DateTime.now()
-        .subtract(const Duration(days: participantInactiveDuration));
-    final participantDropoutDays = DateTime.now()
-        .subtract(const Duration(days: participantDropoutDuration));
-
-    for (final item in items) {
-      if (!item.droppedOut) {
-        if (item.currentDayOfStudy < item.studyDurationInDays) {
-          if (item.lastActivityAt.isAfter(participantInactiveDays)) {
-            activeParticipants += 1; // Active
-          } else {
-            if (item.lastActivityAt.isBefore(participantDropoutDays)) {
-              dropoutParticipants += 1; //dropout
-            } else {
-              inactiveParticipants += 1; // Inactive
-            }
-          }
-        } else {
-          completedParticipants += 1; // Completed
-        }
-      } else {
-        dropoutParticipants += 1; // Dropout
-      }
-    }
+    final participantCategories = items.activeParticipants.toList() +
+        items.inactiveParticipants.toList() +
+        items.dropoutParticipants.toList() +
+        items.completedParticipants.toList();
+    final deepEq = const DeepCollectionEquality.unordered().equals;
+    assert(deepEq(items, participantCategories));
 
-    assert(
-      activeParticipants +
-              inactiveParticipants +
-              dropoutParticipants +
-              completedParticipants ==
-          items.length,
-    );
-
-    return StudyMonitorData(
-      activeParticipants: activeParticipants,
-      inactiveParticipants: inactiveParticipants,
-      dropoutParticipants: dropoutParticipants,
-      completedParticipants: completedParticipants,
-      items: items,
-    );
+    return items;
   }
 }
+
+extension ListX on List<StudyMonitorItem> {
+  static final inactiveDate = DateTime.now()
+      .subtract(const Duration(days: Config.participantInactiveDuration));
+  static final dropoutDate = DateTime.now()
+      .subtract(const Duration(days: Config.participantDropoutDuration));
+
+  static bool Function(StudyMonitorItem p) get studyStillRunning =>
+      (StudyMonitorItem p) => p.currentDayOfStudy < p.studyDurationInDays;
+
+  static bool Function(StudyMonitorItem p) get inactive => (p) =>
+      p.lastActivityAt.isBefore(inactiveDate) &&
+      p.lastActivityAt.isAfter(dropoutDate);
+
+  static bool Function(StudyMonitorItem p) get dropout =>
+      (p) => p.droppedOut || dropoutByDuration(p) && studyStillRunning(p);
+
+  static bool Function(StudyMonitorItem p) get dropoutByDuration =>
+      (p) => p.lastActivityAt.isBefore(dropoutDate);
+
+  /// Number of participants who are currently active in the study
+  /// Active means that the the study has not ended yet and the participant
+  /// did not drop out
+  Iterable<StudyMonitorItem> get activeParticipants =>
+      where((p) => !dropout(p) && !inactive(p) && studyStillRunning(p));
+
+  /// Number of participants who are currently inactive in the study for more
+  /// than [participantDropoutDuration] days in a row
+  Iterable<StudyMonitorItem> get inactiveParticipants => where(
+        (p) => !dropout(p) && inactive(p) && studyStillRunning(p),
+      );
+
+  /// Number of participants who dropped out of the study before the study ended
+  /// Hint: The is_deleted flag in the study_subject database table marks a
+  /// participant as dropped out
+  /// Note: If the participant's last activity exceeds
+  /// [participantDropoutDuration] days, they will also be counted as a dropout
+  Iterable<StudyMonitorItem> get dropoutParticipants => where(
+        (p) => dropout(p),
+      );
+
+  /// Number of participants who completed the study
+  /// Completed means that the participant has reached the end of the study
+  Iterable<StudyMonitorItem> get completedParticipants =>
+      where((p) => !dropout(p) && !studyStillRunning(p));
+}
diff --git a/designer_v2/lib/features/design/interventions/interventions_form_view.dart b/designer_v2/lib/features/design/interventions/interventions_form_view.dart
index bedf14852..bc11a1728 100644
--- a/designer_v2/lib/features/design/interventions/interventions_form_view.dart
+++ b/designer_v2/lib/features/design/interventions/interventions_form_view.dart
@@ -5,6 +5,7 @@ import 'package:studyu_core/core.dart';
 import 'package:studyu_designer_v2/common_views/async_value_widget.dart';
 import 'package:studyu_designer_v2/common_views/text_hyperlink.dart';
 import 'package:studyu_designer_v2/common_views/text_paragraph.dart';
+import 'package:studyu_designer_v2/common_views/utils.dart';
 import 'package:studyu_designer_v2/features/design/interventions/intervention_form_controller.dart';
 import 'package:studyu_designer_v2/features/design/interventions/study_schedule_form_view.dart';
 import 'package:studyu_designer_v2/features/design/study_design_page_view.dart';
@@ -13,7 +14,6 @@ import 'package:studyu_designer_v2/features/forms/form_array_table.dart';
 import 'package:studyu_designer_v2/features/study/study_controller.dart';
 import 'package:studyu_designer_v2/localization/app_translation.dart';
 import 'package:studyu_designer_v2/theme.dart';
-import 'package:studyu_designer_v2/utils/extensions.dart';
 
 class StudyDesignInterventionsFormView extends StudyDesignPageWidget {
   const StudyDesignInterventionsFormView(super.studyId, {super.key});
@@ -21,8 +21,6 @@ class StudyDesignInterventionsFormView extends StudyDesignPageWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final state = ref.watch(studyControllerProvider(studyId));
-    final theme = Theme.of(context);
-
     return AsyncValueWidget<Study>(
       value: state.study,
       data: (study) {
@@ -68,22 +66,8 @@ class StudyDesignInterventionsFormView extends StudyDesignPageWidget {
                         emptyDescription:
                             tr.form_array_interventions_empty_description,
                         hideLeadingTrailingWhenEmpty: true,
-                        rowPrefix: (context, viewModel, rowIdx) {
-                          return Row(
-                            children: [
-                              Text(
-                                ''.alphabetLetterFrom(rowIdx).toUpperCase(),
-                                style: TextStyle(
-                                  color:
-                                      ThemeConfig.dropdownMenuItemTheme(theme)
-                                          .iconTheme!
-                                          .color,
-                                ),
-                              ),
-                              const SizedBox(width: 16.0),
-                            ],
-                          );
-                        },
+                        rowPrefix: (context, viewModel, rowIdx) =>
+                            interventionPrefix(rowIdx, context),
                       );
                     },
                   );
diff --git a/designer_v2/lib/features/monitor/participant_details_view.dart b/designer_v2/lib/features/monitor/participant_details_view.dart
index a5540ecd2..ab6aa9bbb 100644
--- a/designer_v2/lib/features/monitor/participant_details_view.dart
+++ b/designer_v2/lib/features/monitor/participant_details_view.dart
@@ -11,18 +11,19 @@ import 'package:studyu_designer_v2/localization/locale_providers.dart';
 import 'package:studyu_designer_v2/utils/extensions.dart';
 
 class ParticipantDetailsView extends ConsumerWidget {
-  const ParticipantDetailsView({
+  ParticipantDetailsView({
     required this.monitorItem,
-    required this.interventions,
-    required this.observations,
-    required this.studySchedule,
+    required this.study,
     super.key,
-  });
+  })  : studySchedule = study.schedule,
+        interventions = study.interventions,
+        observations = study.observations;
 
   final StudyMonitorItem monitorItem;
+  final Study study;
+  final StudySchedule studySchedule;
   final List<Intervention> interventions;
   final List<Observation> observations;
-  final StudySchedule studySchedule;
 
   static const Color incompleteColor = Color.fromARGB(255, 234, 234, 234);
   // Add transparency to increase the readability of the text
@@ -47,7 +48,7 @@ class ParticipantDetailsView extends ConsumerWidget {
                 text: tr.participant_details_study_days_description,
               ),
               const SizedBox(height: 16.0),
-              _buildPerDayStatus(),
+              _buildPerDayStatus(context),
               const SizedBox(height: 16.0),
               _buildColorLegend(),
             ],
@@ -101,9 +102,8 @@ class ParticipantDetailsView extends ConsumerWidget {
     );
   }
 
-  Widget _buildPerDayStatus() {
-    final int totalCompletedDays = monitorItem.missedTasksPerDay.length;
-
+  Widget _buildPerDayStatus(BuildContext context) {
+    final totalCompletedDays = monitorItem.missedTasksPerDay.length;
     final phases = <StudyPhase>[];
 
     if (studySchedule.includeBaseline) {
@@ -120,9 +120,11 @@ class ParticipantDetailsView extends ConsumerWidget {
       );
     }
 
-    final String sequence = studySchedule.nameOfSequence;
-
-    for (int i = 0; i < studySchedule.numberOfCycles * 2; i++) {
+    final numberOfInterventionPhases = studySchedule.numberOfCycles *
+        (studySchedule.sequence == PhaseSequence.customized
+            ? studySchedule.sequenceCustom.length
+            : StudySchedule.numberOfInterventions);
+    for (int i = 0; i < numberOfInterventionPhases; i++) {
       final int phaseDuration = studySchedule.phaseDuration;
       final bool includeBaseline = studySchedule.includeBaseline;
       final int baselineAdjustmentStart =
@@ -140,16 +142,15 @@ class ParticipantDetailsView extends ConsumerWidget {
           ? baselineAdjustmentEnd
           : totalCompletedDays;
 
-      var sequenceIndex = i;
-      if (sequenceIndex > 3) sequenceIndex = i % 4;
-
-      final String interventionName = sequence[sequenceIndex] == "A"
-          ? interventions[0].name!
-          : interventions[1].name!;
+      monitorItem.studySubject.study = study;
+      final intervention = monitorItem.studySubject
+          .getInterventionsInOrder()[i + (includeBaseline ? 1 : 0)];
+      final interventionIdx = study.interventions.indexOf(intervention);
 
       phases.add(
         StudyPhase(
-          name: interventionName,
+          name: intervention.name!,
+          prefix: interventionPrefix(interventionIdx, context),
           missedTasksPerDay: monitorItem.missedTasksPerDay.sublist(start, end),
         ),
       );
@@ -165,9 +166,15 @@ class ParticipantDetailsView extends ConsumerWidget {
         return Column(
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
-            Text(
-              phase.name,
-              style: const TextStyle(fontWeight: FontWeight.bold),
+            Row(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                if (phase.prefix != null) phase.prefix!,
+                Text(
+                  phase.name,
+                  style: const TextStyle(fontWeight: FontWeight.bold),
+                ),
+              ],
             ),
             const SizedBox(height: 10),
             Wrap(
@@ -232,20 +239,24 @@ class ParticipantDetailsView extends ConsumerWidget {
     for (final intervention in interventions) {
       for (final task in intervention.tasks) {
         if (missedTaskIds.contains(task.id)) {
-          sb.writeln('\u{274C} ${intervention.name} - ${task.title}');
+          sb.writeln('\u{274C} ${task.title}');
         } else if (completedTaskIds.contains(task.id)) {
-          sb.writeln('\u{2705} ${intervention.name} - ${task.title}');
+          sb.writeln('\u{2705} ${task.title}');
         }
       }
     }
     for (final observation in observations) {
       if (missedTaskIds.contains(observation.id)) {
-        sb.write('\u{274C} ${observation.title}');
+        sb.writeln('\u{274C} ${observation.title}');
       } else if (completedTaskIds.contains(observation.id)) {
-        sb.write('\u{2705} ${observation.title}');
+        sb.writeln('\u{2705} ${observation.title}');
       }
     }
-    return sb.toString();
+    String str = sb.toString();
+    if (str.isNotEmpty) {
+      str = sb.toString().substring(0, sb.length - 1);
+    }
+    return str;
   }
 
   Widget _buildColorLegend() {
@@ -354,7 +365,12 @@ class ParticipantDetailsView extends ConsumerWidget {
 
 class StudyPhase {
   final String name;
+  final Widget? prefix;
   final List<Set<String>> missedTasksPerDay;
 
-  StudyPhase({required this.name, required this.missedTasksPerDay});
+  StudyPhase({
+    required this.name,
+    this.prefix,
+    required this.missedTasksPerDay,
+  });
 }
diff --git a/designer_v2/lib/features/monitor/study_monitor_page.dart b/designer_v2/lib/features/monitor/study_monitor_page.dart
index 87bb7f042..d3c2b485b 100644
--- a/designer_v2/lib/features/monitor/study_monitor_page.dart
+++ b/designer_v2/lib/features/monitor/study_monitor_page.dart
@@ -28,7 +28,7 @@ class StudyMonitorScreen extends StudyPageWidget {
           children: <Widget>[
             _monitorSectionHeader(context, studyMonitorData),
             const SizedBox(height: 32.0),
-            if (studyMonitorData.items.isNotEmpty) ...[
+            if (studyMonitorData.isNotEmpty) ...[
               SelectableText(
                 tr.monitoring_participants_title,
                 style: Theme.of(context).textTheme.headlineSmall,
@@ -36,7 +36,7 @@ class StudyMonitorScreen extends StudyPageWidget {
               Container(width: 32.0),
               StudyMonitorTable(
                 ref: ref,
-                studyMonitorItems: studyMonitorData.items,
+                studyMonitorItems: studyMonitorData,
                 onSelectItem: (item) =>
                     _onSelectParticipant(context, ref, item, study),
               ),
@@ -54,24 +54,29 @@ class StudyMonitorScreen extends StudyPageWidget {
 
   Widget _monitorSectionHeader(
     BuildContext context,
-    StudyMonitorData monitorData,
+    List<StudyMonitorItem> monitorData,
   ) {
     final theme = Theme.of(context);
-    final int total = monitorData.items.length;
+    final int total = monitorData.length;
     const double minPercentage = 0.01; // Minimum percentage for visibility
 
-    double activePercentage = monitorData.activeParticipants / total;
-    double inactivePercentage = monitorData.inactiveParticipants / total;
-    double dropoutPercentage = monitorData.dropoutParticipants / total;
-    double completedPercentage = monitorData.completedParticipants / total;
+    double activePercentage = monitorData.activeParticipants.length / total;
+    double inactivePercentage = monitorData.inactiveParticipants.length / total;
+    double dropoutPercentage = monitorData.dropoutParticipants.length / total;
+    double completedPercentage =
+        monitorData.completedParticipants.length / total;
 
     // Adjust for minimum percentage visibility
-    if (monitorData.activeParticipants == 0) activePercentage = minPercentage;
-    if (monitorData.inactiveParticipants == 0) {
+    if (monitorData.activeParticipants.isEmpty) {
+      activePercentage = minPercentage;
+    }
+    if (monitorData.inactiveParticipants.isEmpty) {
       inactivePercentage = minPercentage;
     }
-    if (monitorData.dropoutParticipants == 0) dropoutPercentage = minPercentage;
-    if (monitorData.completedParticipants == 0) {
+    if (monitorData.dropoutParticipants.isEmpty) {
+      dropoutPercentage = minPercentage;
+    }
+    if (monitorData.completedParticipants.isEmpty) {
       completedPercentage = minPercentage;
     }
 
@@ -137,28 +142,28 @@ class StudyMonitorScreen extends StudyPageWidget {
                   _buildLegend(
                     color: activeColor,
                     text:
-                        '${tr.monitoring_active}: ${monitorData.activeParticipants}',
+                        '${tr.monitoring_active}: ${monitorData.activeParticipants.length}',
                     tooltip: tr.monitoring_active_tooltip,
                   ),
                   const SizedBox(width: 10),
                   _buildLegend(
                     color: inactiveColor,
                     text:
-                        '${tr.monitoring_inactive}: ${monitorData.inactiveParticipants}',
+                        '${tr.monitoring_inactive}: ${monitorData.inactiveParticipants.length}',
                     tooltip: tr.monitoring_inactive_tooltip,
                   ),
                   const SizedBox(width: 10),
                   _buildLegend(
                     color: dropoutColor,
                     text:
-                        '${tr.monitoring_dropout}: ${monitorData.dropoutParticipants}',
+                        '${tr.monitoring_dropout}: ${monitorData.dropoutParticipants.length}',
                     tooltip: tr.monitoring_dropout_tooltip,
                   ),
                   const SizedBox(width: 10),
                   _buildLegend(
                     color: completedColor,
                     text:
-                        '${tr.monitoring_completed}: ${monitorData.completedParticipants}',
+                        '${tr.monitoring_completed}: ${monitorData.completedParticipants.length}',
                     tooltip: tr.monitoring_completed_tooltip,
                   ),
                 ],
@@ -214,15 +219,12 @@ class StudyMonitorScreen extends StudyPageWidget {
     StudyMonitorItem item,
     Study study,
   ) {
-    // TODO: refactor to use [RoutingIntent] for sidesheet (so that it can be triggered from controller)
     showModalSideSheet(
       context: context,
       title: tr.participant_details_title,
       body: ParticipantDetailsView(
         monitorItem: item,
-        interventions: study.interventions,
-        observations: study.observations,
-        studySchedule: study.schedule,
+        study: study,
       ),
       actionButtons: [
         retainSizeInAppBar(