diff --git a/tracetools_analysis/tracetools_analysis/data_model/__init__.py b/tracetools_analysis/tracetools_analysis/data_model/__init__.py
index 4b18865..c2744aa 100644
--- a/tracetools_analysis/tracetools_analysis/data_model/__init__.py
+++ b/tracetools_analysis/tracetools_analysis/data_model/__init__.py
@@ -11,3 +11,15 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
+"""Base data model module."""
+
+
+class DataModel():
+    """
+    Container with pre-processed data for an analysis to use.
+
+    Contains data for an analysis to use. This is a middleground between trace events data and the
+    output data of an analysis. It uses pandas `DataFrame` directly.
+    """
+    pass
diff --git a/tracetools_analysis/tracetools_analysis/data_model/cpu_time.py b/tracetools_analysis/tracetools_analysis/data_model/cpu_time.py
index b7a1eeb..e11d531 100644
--- a/tracetools_analysis/tracetools_analysis/data_model/cpu_time.py
+++ b/tracetools_analysis/tracetools_analysis/data_model/cpu_time.py
@@ -16,12 +16,14 @@
 
 import pandas as pd
 
+from . import DataModel
 
-class CpuTimeDataModel():
+
+class CpuTimeDataModel(DataModel):
     """
     Container to model pre-processed CPU time data for analysis.
 
-    Contains data for an analysis to use. It uses pandas DataFrames directly.
+    Contains every duration instance.
     """
 
     def __init__(self) -> None:
diff --git a/tracetools_analysis/tracetools_analysis/data_model/ros.py b/tracetools_analysis/tracetools_analysis/data_model/ros.py
index a82ed3b..056d0a8 100644
--- a/tracetools_analysis/tracetools_analysis/data_model/ros.py
+++ b/tracetools_analysis/tracetools_analysis/data_model/ros.py
@@ -16,14 +16,14 @@
 
 import pandas as pd
 
+from . import DataModel
 
-class RosDataModel():
+
+class RosDataModel(DataModel):
     """
     Container to model pre-processed ROS data for analysis.
 
-    Contains data for an analysis to use. This is a middleground between ROS userspace trace
-    events data and the output data of an analysis. This aims to represent the data in a
-    ROS-aware way. It uses pandas DataFrames directly.
+    This aims to represent the data in a ROS-aware way.
     """
 
     def __init__(self) -> None: