diff --git a/marl_eval/plotting_tools/plot_utils.py b/marl_eval/plotting_tools/plot_utils.py
index 02b34948..de22748d 100644
--- a/marl_eval/plotting_tools/plot_utils.py
+++ b/marl_eval/plotting_tools/plot_utils.py
@@ -36,6 +36,7 @@ def plot_single_task_curve(
     ticklabelsize: str = "xx-large",
     legend_map: Optional[Dict] = None,
     run_times: Optional[Dict] = None,
+    fix_normed_axis: bool = False,
     **kwargs: Any,
 ) -> Figure:
     """Plots an aggregate metric with CIs as a function of environment frames.
@@ -60,6 +61,7 @@ def plot_single_task_curve(
         If None, then this mapping is created based on `algorithms`.
       run_times: Dictionary that maps each algorithm to the number of seconds it
         took to run. If None, then environment steps will be displayed.
+      fix_normed_axis: If the metric is normalised, fix the y-axis from 0 to 1.
       **kwargs: Arbitrary keyword arguments.
 
     Returns:
@@ -78,6 +80,8 @@ def plot_single_task_curve(
     marker = kwargs.pop("marker", "o")
     linewidth = kwargs.pop("linewidth", 2)
 
+    highest_upper_val = 1
+
     for algorithm in algorithms:
         x_axis_len = len(aggregated_data[algorithm]["mean"])
 
@@ -94,6 +98,9 @@ def plot_single_task_curve(
             metric_values + confidence_interval,
         )
 
+        if fix_normed_axis is True and highest_upper_val < np.max(upper):
+            highest_upper_val = np.max(upper)
+
         if legend_map is not None:
             algorithm_name = legend_map[algorithm]
         else:
@@ -111,6 +118,9 @@ def plot_single_task_curve(
             x_axis_values, y1=lower, y2=upper, color=colors[algorithm], alpha=0.2
         )
 
+    if fix_normed_axis is True:
+        ax.set_ylim(0, highest_upper_val)
+
     return _annotate_and_decorate_axis(
         ax,
         xlabel=xlabel,
diff --git a/marl_eval/plotting_tools/plotting.py b/marl_eval/plotting_tools/plotting.py
index 49b33e5f..98e45a8a 100644
--- a/marl_eval/plotting_tools/plotting.py
+++ b/marl_eval/plotting_tools/plotting.py
@@ -420,6 +420,8 @@ def plot_single_task(
         metric_name, task_name, environment_name, metrics_to_normalize
     )
 
+    fix_normed_axis = False
+
     task_mean_ci_data = get_and_aggregate_data_single_task(
         processed_data=processed_data,
         environment_name=environment_name,
@@ -430,6 +432,7 @@ def plot_single_task(
 
     if metric_name in metrics_to_normalize:
         ylabel = "Normalized " + " ".join(metric_name.split("_"))
+        fix_normed_axis = True
     else:
         ylabel = " ".join(metric_name.split("_")).capitalize()
 
@@ -460,6 +463,7 @@ def plot_single_task(
         legend_map=legend_map,
         run_times=run_times,
         marker="",
+        fix_normed_axis=fix_normed_axis,
     )
 
     return fig
diff --git a/marl_eval/utils/data_processing_utils.py b/marl_eval/utils/data_processing_utils.py
index a87f472d..1841d69a 100644
--- a/marl_eval/utils/data_processing_utils.py
+++ b/marl_eval/utils/data_processing_utils.py
@@ -99,7 +99,7 @@ def get_and_aggregate_data_single_task(
     Args:
         processed_data: Dictionary containing processed data.
         metric_name: Name of metric to aggregate.
-        metrics_to_normalize: List of metrics to normalize.
+        metrics_to_normalize: List of metrics to normalise.
         task_name: Name of task to aggregate.
         environment_name: Name of environment to aggregate.
     """
@@ -150,6 +150,8 @@ def get_and_aggregate_data_single_task(
 def data_process_pipeline(  # noqa: C901
     raw_data: Dict[str, Dict[str, Any]],
     metrics_to_normalize: List[str],
+    custom_min: Dict[str, Dict[str, float]] = {},
+    custom_max: Dict[str, Dict[str, float]] = {},
 ) -> Dict[str, Dict[str, Any]]:
     """Function for processing raw input experiment data.
 
@@ -159,6 +161,10 @@ def data_process_pipeline(  # noqa: C901
         metrics_to_normalize: A list of metric names for metrics that should
             be min/max normalised. These metric names should match the names as
             given in the raw dataset.
+        custom_min (optional): Dictionary containing custom global minimum values
+            for normalisation. Keys are task names and values are floats.
+        custom_max (optional): Dictionary containing custom global maximum values
+            for normalisation. Keys are task names and values are floats.
 
     Returns:
         processed_data: Dictionary containing processed experiment data where relevant
@@ -246,7 +252,7 @@ def _compare_values(
                                         f"mean_{metric}"
                                     ] = mean
                                     if metric in metrics_to_normalize:
-                                        # Normalization
+                                        # Normalisation
                                         metric_array = np.array(metrics[metric])
                                         metric_global_min = metric_min_max_info[metric][
                                             "global_min"
@@ -254,6 +260,17 @@ def _compare_values(
                                         metric_global_max = metric_min_max_info[metric][
                                             "global_max"
                                         ]
+                                        # Use the custom min or max if given
+                                        if (
+                                            task in custom_min.keys()
+                                            and metric in custom_min[task].keys()
+                                        ):
+                                            metric_global_min = custom_min[task][metric]
+                                        if (
+                                            task in custom_max.keys()
+                                            and metric in custom_max[task].keys()
+                                        ):
+                                            metric_global_max = custom_max[task][metric]
                                         normed_metric_array = (
                                             metric_array - metric_global_min
                                         ) / (