diff --git a/scidash/general/admin.py b/scidash/general/admin.py
index 13ded1e7..f73fb977 100644
--- a/scidash/general/admin.py
+++ b/scidash/general/admin.py
@@ -2,9 +2,10 @@
 from django.contrib.auth.admin import UserAdmin
 from django.contrib.contenttypes.models import ContentType
 
-from scidash.general.models import ScidashUser
+from scidash.general.models import ScidashUser, Tag
 
 # Register your models here.
 
 admin.site.register(ScidashUser, UserAdmin)
 admin.site.register(ContentType)
+admin.site.register(Tag)
diff --git a/scidash/main/settings.py b/scidash/main/settings.py
index f5eaf596..40d567a0 100644
--- a/scidash/main/settings.py
+++ b/scidash/main/settings.py
@@ -240,3 +240,5 @@
 )
 
 CELERY_RESULT_BACKEND = 'django-db'
+
+NO_IMPORT_TAG = 'unschedulable'
diff --git a/scidash/sciunitmodels/api/views.py b/scidash/sciunitmodels/api/views.py
index 74e4ebfd..f7d2b938 100644
--- a/scidash/sciunitmodels/api/views.py
+++ b/scidash/sciunitmodels/api/views.py
@@ -5,11 +5,14 @@
 
 from rest_framework import permissions, response, views, viewsets
 from django.db.models import Q
+from django.conf import settings as s
+from django.contrib.contenttypes.models import ContentType
 
 import scidash.sciunitmodels.helpers as hlp
 from scidash.sciunitmodels.filters import ModelClassFilter, ModelInstanceFilter
 from scidash.sciunitmodels.models import Capability, ModelClass, ModelInstance
 from pygeppetto_gateway.interpreters.helpers import URLProcessor
+from scidash.general.models import Tag
 from scidash.sciunitmodels.serializers import (
     CapabilitySerializer, ModelClassSerializer, ModelInstanceSerializer
 )
@@ -36,6 +39,35 @@ class ModelInstanceViewSet(viewsets.ModelViewSet):
     permission_classes = (permissions.IsAuthenticatedOrReadOnly, )
     filter_class = ModelInstanceFilter
 
+    def filter_queryset(self, queryset):
+        model_instance_content_type = ContentType.objects.get_for_model(
+            ModelInstance
+        )
+
+        ModelInstance.objects.filter(model_class__import_path='').update(
+            status=ModelInstance.LOCKED
+        )
+
+        for instance in ModelInstance.objects.filter(
+            model_class__import_path=''
+        ):
+            Tag.objects.get_or_create(
+                name=s.NO_IMPORT_TAG,
+                content_type=model_instance_content_type,
+                object_id=instance.pk
+            )
+
+        ModelInstance.objects.filter(
+            Q(score__isnull=True) & ~Q(model_class__import_path='')
+        ).update(status=ModelInstance.AVAILABLE)
+
+        for instance in ModelInstance.objects.filter(
+            ~Q(model_class__import_path='')
+        ):
+            instance.tags.filter(name=s.NO_IMPORT_TAG).delete()
+
+        return queryset
+
 
 class ModelParametersView(views.APIView):
     def get(self, request):
diff --git a/scidash/sciunittests/api/views.py b/scidash/sciunittests/api/views.py
index 323dfaaf..52c0664e 100644
--- a/scidash/sciunittests/api/views.py
+++ b/scidash/sciunittests/api/views.py
@@ -4,6 +4,8 @@
 
 from rest_framework import permissions, response, views, viewsets
 from django.db.models import Q
+from django.conf import settings as s
+from django.contrib.contenttypes.models import ContentType
 
 from scidash.general.models import Tag
 from scidash.sciunittests.filters import (
@@ -31,6 +33,35 @@ class TestInstanceViewSet(viewsets.ModelViewSet):
     permission_classes = (permissions.IsAuthenticatedOrReadOnly, )
     filter_class = TestInstanceFilter
 
+    def filter_queryset(self, queryset):
+        test_instance_content_type = ContentType.objects.get_for_model(
+            TestInstance
+        )
+
+        TestInstance.objects.filter(test_class__import_path='').update(
+            status=TestInstance.LOCKED
+        )
+
+        for instance in TestInstance.objects.filter(
+            test_class__import_path=''
+        ):
+            Tag.objects.get_or_create(
+                name=s.NO_IMPORT_TAG,
+                content_type=test_instance_content_type,
+                object_id=instance.pk
+            )
+
+        TestInstance.objects.filter(
+            Q(score__isnull=True) & ~Q(test_class__import_path='')
+        ).update(status=TestInstance.AVAILABLE)
+
+        for instance in TestInstance.objects.filter(
+            ~Q(test_class__import_path='')
+        ):
+            instance.tags.filter(name=s.NO_IMPORT_TAG).delete()
+
+        return queryset
+
 
 class TestSuiteViewSet(viewsets.ReadOnlyModelViewSet):
     queryset = TestSuite.objects.all()
diff --git a/scidash/sciunittests/models.py b/scidash/sciunittests/models.py
index 640fa4c4..3c0450ba 100644
--- a/scidash/sciunittests/models.py
+++ b/scidash/sciunittests/models.py
@@ -178,8 +178,10 @@ class ScoreInstance(models.Model):
         max_length=200, default='', null=True, blank=True
     )
     score_class = models.ForeignKey(ScoreClass, null=True, blank=True)
-    model_instance = models.ForeignKey(sciunitmodels.models.ModelInstance)
-    test_instance = models.ForeignKey(TestInstance)
+    model_instance = models.ForeignKey(
+        sciunitmodels.models.ModelInstance, related_name='score'
+    )
+    test_instance = models.ForeignKey(TestInstance, related_name='score')
     score = models.FloatField(default=0, null=True, blank=True)
     sort_key = models.FloatField(default=0)
     prediction_numeric = models.FloatField(default=None, null=True, blank=True)