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+# Bulk Assignment Implementation
+
+## Overview
+Implemented bulk assignment functionality for the TaskBrowser component, allowing users to assign multiple selected tasks to a user through the context menu.
+
+## Implementation Details
+
+### Frontend Changes
+
+#### TaskBrowser.vue
+Added `handleBulkAssignment` method that:
+1. Extracts selected task IDs from the selection state
+2. Calls `taskService.bulkAssignTasks` with task IDs and user ID
+3. Shows loading state during the operation
+4. Displays success toast with count of assigned tasks
+5. Handles errors and displays error toast
+6. Refreshes task list after successful update
+7. Closes context menu and clears selection after completion
+
+```typescript
+const handleBulkAssignment = async (userId: number) => {
+  try {
+    const taskIds = selectedTasks.value.map(task => task.id)
+    
+    if (taskIds.length === 0) {
+      return
+    }
+
+    isLoading.value = true
+    const result = await taskService.bulkAssignTasks(taskIds, userId)
+
+    toast({
+      title: 'Success',
+      description: `${result.success_count} ${result.success_count === 1 ? 'task' : 'tasks'} assigned`,
+    })
+
+    await fetchTasks()
+    closeContextMenu()
+    rowSelection.value = {}
+  } catch (error) {
+    console.error('Failed to assign tasks:', error)
+    toast({
+      title: 'Error',
+      description: 'Failed to assign tasks. Please try again.',
+      variant: 'destructive',
+    })
+  } finally {
+    isLoading.value = false
+  }
+}
+```
+
+Connected the method to the TaskBulkActionsMenu component:
+```vue
+<TaskBulkActionsMenu
+  v-model:open="showContextMenu"
+  :position="contextMenuPosition"
+  :selected-count="selectedCount"
+  :project-members="projectMembers"
+  @status-selected="handleBulkStatusUpdate"
+  @assignee-selected="handleBulkAssignment"
+/>
+```
+
+### Backend
+The backend endpoint was already implemented in task 1:
+- Endpoint: `PUT /tasks/bulk/assign`
+- Handles atomic assignment (all or nothing)
+- Validates user exists and is a project member
+- Returns success/failure counts
+
+### Service Layer
+The `bulkAssignTasks` method was already implemented in `frontend/src/services/task.ts`:
+```typescript
+async bulkAssignTasks(taskIds: number[], assignedUserId: number): Promise<BulkActionResult> {
+  const response = await apiClient.put('/tasks/bulk/assign', {
+    task_ids: taskIds,
+    assigned_user_id: assignedUserId
+  })
+  return response.data
+}
+```
+
+## Requirements Validated
+
+### Requirement 5.3
+✅ When a user selects an assignee from the submenu, the system updates all selected tasks to be assigned to that user
+
+### Requirement 5.4
+✅ When the bulk assignment completes successfully, the system displays a success notification indicating the number of tasks assigned
+
+### Requirement 5.5
+✅ When the bulk assignment fails, the system displays an error notification and maintains the original assignments (backend handles atomicity)
+
+### Requirement 5.6
+✅ When the assignment update completes, the system refreshes the task list to reflect the changes
+
+### Requirement 6.1
+✅ When a user completes a bulk action from the context menu, the system closes the context menu automatically
+
+### Requirement 6.3
+✅ When a bulk action completes, the system clears the task selections
+
+## User Flow
+
+1. User selects multiple tasks using checkboxes
+2. User right-clicks on a selected task
+3. Context menu appears with "Assign To" option
+4. User hovers over "Assign To" to see submenu with project members
+5. User clicks on a project member
+6. System shows loading state
+7. System calls backend API to assign all selected tasks
+8. On success:
+   - Success toast appears showing count of assigned tasks
+   - Task list refreshes to show updated assignments
+   - Context menu closes
+   - Selection is cleared
+9. On error:
+   - Error toast appears with user-friendly message
+   - Original assignments are maintained (backend atomicity)
+   - Context menu remains open for retry
+
+## Error Handling
+
+The implementation includes comprehensive error handling:
+- Try-catch block wraps the entire operation
+- Loading state is properly managed in finally block
+- Error toast displays user-friendly message
+- Console logs detailed error for debugging
+- Backend ensures atomicity (all tasks assigned or none)
+- Backend validates user exists and is a project member
+
+## Testing
+
+Manual testing steps:
+1. Open TaskBrowser in the application
+2. Select multiple tasks using checkboxes
+3. Right-click on a selected task
+4. Click "Assign To" in the context menu
+5. Select a user from the submenu
+6. Verify success toast appears
+7. Verify task list refreshes
+8. Verify context menu closes
+9. Verify selection is cleared
+10. Verify tasks show the assigned user
+
+See `frontend/test-bulk-assignment.html` for detailed test documentation.
+
+## Files Modified
+
+- `frontend/src/components/task/TaskBrowser.vue` - Added handleBulkAssignment method and connected to context menu
+
+## Files Created
+
+- `frontend/test-bulk-assignment.html` - Test documentation
+- `frontend/docs/bulk-assignment-implementation.md` - This file
+
+## Related Tasks
+
+- Task 1: Set up backend bulk action endpoints (completed)
+- Task 2: Update task service with bulk action methods (completed)
+- Task 7: Create TaskBulkActionsMenu component (completed)
+- Task 8: Implement context menu trigger in TaskBrowser (completed)
+- Task 9: Implement bulk status update action (completed)
+- Task 10: Implement bulk assignment action (completed) ✅
+
+## Next Steps
+
+The next task in the implementation plan is:
+- Task 11: Implement keyboard shortcuts for selection operations