diff --git a/docs/source/optimize_interface.ipynb b/docs/source/optimize_interface.ipynb
index 2dd686b0..54e2b597 100644
--- a/docs/source/optimize_interface.ipynb
+++ b/docs/source/optimize_interface.ipynb
@@ -49,7 +49,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": null,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -1460,7 +1460,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 2,
    "metadata": {},
    "outputs": [
     {
@@ -1473,7 +1473,9 @@
     }
    ],
    "source": [
-    "intervened_params = [\"beta_c\", \"gamma\"]\n",
+    "from pyciemss.integration_utils.intervention_builder import intervention_func_combinator\n",
+    "\n",
+    "intervened_params = [\"beta_c\", \"gamma\", \"gamma_c\"]\n",
     "static_parameter_interventions1 = param_value_objective(\n",
     "    param_name=[intervened_params[0]],\n",
     "    start_time=torch.tensor([10.0]),\n",
@@ -1482,6 +1484,7 @@
     "    param_name=[intervened_params[1]],\n",
     "    param_value=torch.tensor([0.4]),\n",
     ")\n",
+    "\n",
     "# Combine different intervention templates into a list of Callables\n",
     "static_parameter_interventions = lambda x: [\n",
     "    static_parameter_interventions1(torch.atleast_1d(x[0])),\n",
@@ -1494,6 +1497,30 @@
     "print(static_parameter_interventions(torch.tensor([0.4, 5.0])))"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 4,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "{10.0: {'beta_c': tensor(0.4000)}, 5.0: {'gamma': tensor(0.4000)}}"
+      ]
+     },
+     "execution_count": 4,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "static_parameter_interventions_comb = intervention_func_combinator(\n",
+    "    [static_parameter_interventions1, static_parameter_interventions2],\n",
+    "    [1, 1],\n",
+    ")\n",
+    "static_parameter_interventions_comb(torch.tensor([0.4, 5.0]))"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 11,
diff --git a/pyciemss/integration_utils/intervention_builder.py b/pyciemss/integration_utils/intervention_builder.py
index 16551092..90d57c70 100644
--- a/pyciemss/integration_utils/intervention_builder.py
+++ b/pyciemss/integration_utils/intervention_builder.py
@@ -73,6 +73,32 @@ def intervention_generator(
     return intervention_generator
 
 
+def intervention_func_combinator(
+    intervention_funcs: List[
+        Callable[[torch.Tensor], Dict[float, Dict[str, Intervention]]]
+    ],
+    intervention_func_lengths: List[int],
+) -> Callable[[torch.Tensor], Dict[float, Dict[str, Intervention]]]:
+    assert len(intervention_funcs) == len(intervention_func_lengths)
+
+    total_length = sum(intervention_func_lengths)
+
+    # Note: This only works for combining static parameter interventions.
+    def intervention_generator(
+        x: torch.Tensor,
+    ) -> Dict[float, Dict[str, Intervention]]:
+        x = torch.atleast_1d(x)
+        assert x.size()[0] == total_length
+        interventions = [None] * len(intervention_funcs)
+        i = 0
+        for j, (input_length, intervention_func) in enumerate(zip(intervention_func_lengths, intervention_funcs)):
+            interventions[j] = intervention_func(x[i:i + input_length])
+            i += input_length
+        return combine_static_parameter_interventions(interventions)
+
+    return intervention_generator
+
+
 def start_time_param_value_objective(
     param_name: List[str],
     param_value: List[Intervention] = [None],
diff --git a/pyciemss/ouu/ouu.py b/pyciemss/ouu/ouu.py
index c86197b9..8f7ea823 100644
--- a/pyciemss/ouu/ouu.py
+++ b/pyciemss/ouu/ouu.py
@@ -139,8 +139,8 @@ def propagate_uncertainty(self, x):
                 ]
                 intervention_list.extend(
                     [self.interventions(torch.from_numpy(x))]
-                    if not isinstance(self.interventions(torch.from_numpy(x)), list)
-                    else self.interventions(torch.from_numpy(x))
+                    # if not isinstance(self.interventions(torch.from_numpy(x)), list)
+                    # else self.interventions(torch.from_numpy(x))
                 )
                 static_parameter_interventions = combine_static_parameter_interventions(
                     intervention_list