diff --git a/src/bonsai/bonsai/tool/sequence.py b/src/bonsai/bonsai/tool/sequence.py
index 815c456f27..14c88dd251 100644
--- a/src/bonsai/bonsai/tool/sequence.py
+++ b/src/bonsai/bonsai/tool/sequence.py
@@ -512,14 +512,12 @@ class Sequence(bonsai.core.tool.Sequence):
     @classmethod
     def get_task_inputs(cls, task: ifcopenshell.entity_instance) -> list[ifcopenshell.entity_instance]:
         props = cls.get_work_schedule_props()
-        is_deep = props.show_nested_inputs
-        return ifcopenshell.util.sequence.get_task_inputs(task, is_deep)
+        return ifcopenshell.util.sequence.get_task_inputs(task, is_recursive=props.show_nested_inputs)
 
     @classmethod
     def get_task_outputs(cls, task: ifcopenshell.entity_instance) -> list[ifcopenshell.entity_instance]:
         props = cls.get_work_schedule_props()
-        is_deep = props.show_nested_outputs
-        return ifcopenshell.util.sequence.get_task_outputs(task, is_deep)
+        return ifcopenshell.util.sequence.get_task_outputs(task, is_recursive=props.show_nested_outputs)
 
     @classmethod
     def are_entities_same_class(cls, entities: list[ifcopenshell.entity_instance]) -> bool:
@@ -540,8 +538,7 @@ class Sequence(bonsai.core.tool.Sequence):
         if not task:
             return
         props = cls.get_work_schedule_props()
-        is_deep = props.show_nested_resources
-        return ifcopenshell.util.sequence.get_task_resources(task, is_deep)
+        return ifcopenshell.util.sequence.get_task_resources(task, props.show_nested_resources)
 
     @classmethod
     def load_task_inputs(cls, inputs: list[ifcopenshell.entity_instance]) -> None:
@@ -1582,7 +1579,7 @@ class Sequence(bonsai.core.tool.Sequence):
     @classmethod
     def create_new_task_json(cls, task, json, type_map=None, baseline_schedule=None):
         task_time = task.TaskTime
-        resources = ifcopenshell.util.sequence.get_task_resources(task, is_deep=False)
+        resources = ifcopenshell.util.sequence.get_task_resources(task, is_recursive=False)
 
         string_resources = ""
         resources_usage = ""
@@ -1689,8 +1686,8 @@ class Sequence(bonsai.core.tool.Sequence):
     ) -> list[ifcopenshell.entity_instance]:
         products = []
         for task in ifcopenshell.util.sequence.get_root_tasks(work_schedule):
-            products.extend(ifcopenshell.util.sequence.get_task_inputs(task, is_deep=True))
-            products.extend(ifcopenshell.util.sequence.get_task_outputs(task, is_deep=True))
+            products.extend(ifcopenshell.util.sequence.get_task_inputs(task, is_recursive=True))
+            products.extend(ifcopenshell.util.sequence.get_task_outputs(task, is_recursive=True))
         return products
 
     @classmethod
@@ -1794,7 +1791,8 @@ class Sequence(bonsai.core.tool.Sequence):
         if not task:
             return
         bpy.ops.object.select_all(action="DESELECT")
-        for element in set(cls.get_task_inputs(task) + cls.get_task_outputs(task)):
+        props = cls.get_work_schedule_props()
+        for element in cls.get_task_inputs(task) | cls.get_task_outputs(task):
             if obj := tool.Ifc.get_object(element):
                 obj.select_set(True)
 
diff --git a/src/ifcopenshell-python/ifcopenshell/api/sequence/edit_task_time.py b/src/ifcopenshell-python/ifcopenshell/api/sequence/edit_task_time.py
index 119ab82a14..ffde70580f 100644
--- a/src/ifcopenshell-python/ifcopenshell/api/sequence/edit_task_time.py
+++ b/src/ifcopenshell-python/ifcopenshell/api/sequence/edit_task_time.py
@@ -143,7 +143,7 @@ class Usecase:
         return next(e for e in self.file.get_inverse(self.task_time) if e.is_a("IfcTask"))
 
     def handle_resource_calculation(self):
-        resources = ifcopenshell.util.sequence.get_task_resources(self.task, is_deep=False)
+        resources = ifcopenshell.util.sequence.get_task_resources(self.task, is_recursive=False)
         for resource in resources:
             if ifcopenshell.util.constraint.is_attribute_locked(resource, "Usage.ScheduleWork"):
                 ifcopenshell.api.resource.calculate_resource_usage(self.file, resource=resource)
diff --git a/src/ifcopenshell-python/ifcopenshell/util/sequence.py b/src/ifcopenshell-python/ifcopenshell/util/sequence.py
index 930184ecdb..1452aa011c 100644
--- a/src/ifcopenshell-python/ifcopenshell/util/sequence.py
+++ b/src/ifcopenshell-python/ifcopenshell/util/sequence.py
@@ -329,61 +329,28 @@ def guess_date_range(work_schedule: ifcopenshell.entity_instance):
     return earliest, latest
 
 
-def get_direct_task_outputs(task: ifcopenshell.entity_instance) -> list[ifcopenshell.entity_instance]:
-    return [rel.RelatingProduct for rel in task.HasAssignments if rel.is_a("IfcRelAssignsToProduct")]
+def get_task_outputs(
+    task: ifcopenshell.entity_instance, is_recursive: bool = False
+) -> set[ifcopenshell.entity_instance]:
+    if is_recursive:
+        return {o for subtask in [task] + list(get_all_nested_tasks(task)) for o in get_task_outputs(subtask)}
+    return {rel.RelatingProduct for rel in task.HasAssignments if rel.is_a("IfcRelAssignsToProduct")}
 
 
-def get_task_outputs(task: ifcopenshell.entity_instance, is_deep: bool = False) -> list[ifcopenshell.entity_instance]:
-    if not is_deep:
-        return get_direct_task_outputs(task)
-    else:
-        return [output for nested_task in get_all_nested_tasks(task) for output in get_direct_task_outputs(nested_task)]
+def get_task_inputs(
+    task: ifcopenshell.entity_instance, is_recursive: bool = False
+) -> set[ifcopenshell.entity_instance]:
+    if is_recursive:
+        return {o for subtask in [task] + list(get_all_nested_tasks(task)) for o in get_task_inputs(subtask)}
+    return {o for rel in task.OperatesOn for o in rel.RelatedObjects if o.is_a("IfcProduct")}
 
 
-def get_task_inputs(task: ifcopenshell.entity_instance, is_deep: bool = False) -> list[ifcopenshell.entity_instance]:
-    if not is_deep:
-        return [
-            object
-            for rel in task.OperatesOn
-            if rel.is_a("IfcRelAssignsToProcess")
-            for object in rel.RelatedObjects
-            if object.is_a("IfcProduct")
-        ]
-    else:
-        return [
-            output
-            for nested_task in get_all_nested_tasks(task)
-            for output in [
-                object
-                for rel in nested_task.OperatesOn
-                if rel.is_a("IfcRelAssignsToProcess")
-                for object in rel.RelatedObjects
-                if object.is_a("IfcProduct")
-            ]
-        ]
-
-
-def get_task_resources(task: ifcopenshell.entity_instance, is_deep: bool = False) -> list[ifcopenshell.entity_instance]:
-    if not is_deep:
-        return [
-            object
-            for rel in task.OperatesOn
-            if rel.is_a("IfcRelAssignsToProcess")
-            for object in rel.RelatedObjects
-            if object.is_a("IfcResource")
-        ]
-    else:
-        return [
-            resource
-            for nested_task in get_all_nested_tasks(task)
-            for resource in [
-                object
-                for rel in nested_task.OperatesOn
-                if rel.is_a("IfcRelAssignsToProcess")
-                for object in rel.RelatedObjects
-                if object.is_a("IfcResource")
-            ]
-        ]
+def get_task_resources(
+    task: ifcopenshell.entity_instance, is_recursive: bool = False
+) -> set[ifcopenshell.entity_instance]:
+    if is_recursive:
+        return {r for subtask in [task] + list(get_all_nested_tasks(task)) for r in get_task_resources(subtask)}
+    return {o for rel in task.OperatesOn for o in rel.RelatedObjects if o.is_a("IfcResource")}
 
 
 def has_task_outputs(task: ifcopenshell.entity_instance) -> bool: