diff --git a/crc/models/study.py b/crc/models/study.py
index 287fe73f..b62a10ce 100644
--- a/crc/models/study.py
+++ b/crc/models/study.py
@@ -1,6 +1,4 @@
-import datetime
 import enum
-import json
 
 import marshmallow
 from marshmallow import INCLUDE, fields
@@ -9,13 +7,11 @@ from sqlalchemy import func
 
 from crc import db, ma
 from crc.api.common import ApiErrorSchema, ApiError
-from crc.models.file import FileModel, SimpleFileSchema, FileSchema
+from crc.models.file import FileSchema
 from crc.models.ldap import LdapModel, LdapSchema
 from crc.models.protocol_builder import ProtocolBuilderCreatorStudy
-from crc.models.workflow import WorkflowSpecCategoryModel, WorkflowState, WorkflowStatus, WorkflowSpecModel, \
-    WorkflowModel
+from crc.models.workflow import WorkflowSpecCategoryModel, WorkflowState, WorkflowStatus, WorkflowModel
 from crc.services.file_service import FileService
-from crc.services.user_service import UserService
 
 
 class StudyStatus(enum.Enum):
diff --git a/crc/models/workflow.py b/crc/models/workflow.py
index ca848cf7..ced02aac 100644
--- a/crc/models/workflow.py
+++ b/crc/models/workflow.py
@@ -1,13 +1,13 @@
 import enum
 
 import marshmallow
-from marshmallow import EXCLUDE,fields
+from marshmallow import EXCLUDE
 from marshmallow_sqlalchemy import SQLAlchemyAutoSchema
 from sqlalchemy import func
 from sqlalchemy.orm import backref
 
 from crc import db
-from crc.models.file import FileModel, FileDataModel
+from crc.models.file import FileDataModel
 
 
 class WorkflowSpecCategoryModel(db.Model):
diff --git a/crc/services/workflow_service.py b/crc/services/workflow_service.py
index 8cd56c37..838d10c2 100755
--- a/crc/services/workflow_service.py
+++ b/crc/services/workflow_service.py
@@ -1,9 +1,7 @@
 import copy
 import json
-import string
 import sys
 import traceback
-from datetime import datetime
 import random
 import string
 from datetime import datetime
@@ -14,26 +12,22 @@ from SpiffWorkflow import Task as SpiffTask, WorkflowException, NavItem
 from SpiffWorkflow.bpmn.PythonScriptEngine import Box
 from SpiffWorkflow.bpmn.specs.EndEvent import EndEvent
 from SpiffWorkflow.bpmn.specs.ManualTask import ManualTask
-from SpiffWorkflow.bpmn.specs.MultiInstanceTask import MultiInstanceTask
 from SpiffWorkflow.bpmn.specs.ScriptTask import ScriptTask
 from SpiffWorkflow.bpmn.specs.StartEvent import StartEvent
 from SpiffWorkflow.bpmn.specs.UserTask import UserTask
 from SpiffWorkflow.dmn.specs.BusinessRuleTask import BusinessRuleTask
-from SpiffWorkflow.specs import CancelTask, StartTask, MultiChoice
+from SpiffWorkflow.specs import CancelTask, StartTask
 from SpiffWorkflow.util.deep_merge import DeepMerge
 from SpiffWorkflow.util.metrics import timeit
 
-from jinja2 import Template
-
-from crc import db, app, session, connexion_app
+from crc import db, app, session
 from crc.api.common import ApiError
 from crc.models.api_models import Task, MultiInstanceType, WorkflowApi
-from crc.models.data_store import DataStoreModel
 from crc.models.file import LookupDataModel, FileModel, File, FileSchema
 from crc.models.ldap import LdapModel
 from crc.models.study import StudyModel
 from crc.models.task_event import TaskEventModel
-from crc.models.user import UserModel, UserModelSchema
+from crc.models.user import UserModel
 from crc.models.workflow import WorkflowModel, WorkflowStatus, WorkflowSpecModel, WorkflowSpecCategoryModel
 from crc.services.data_store_service import DataStoreBase