diff --git a/src/tdastro/base_models.py b/src/tdastro/base_models.py
index 50341d1c..b7b68fbc 100644
--- a/src/tdastro/base_models.py
+++ b/src/tdastro/base_models.py
@@ -37,7 +37,6 @@ def __init__(self, **kwargs):
         **kwargs : `dict`, optional
            Any additional keyword arguments.
         """
-        self.model_name = "ParameterizedModel"
         self.setters = {}
         self.sample_iteration = 0
 
diff --git a/src/tdastro/sources/spline_model.py b/src/tdastro/sources/spline_model.py
index 199b1b78..29a5925f 100644
--- a/src/tdastro/sources/spline_model.py
+++ b/src/tdastro/sources/spline_model.py
@@ -76,7 +76,7 @@ def __init__(
 
     def __str__(self):
         """Return the string representation of the model."""
-        return f"SplineSource{self.name}"
+        return f"SplineModel({self.name})"
 
     def _evaluate(self, times, wavelengths, **kwargs):
         """Draw effect-free observations for this object.
diff --git a/src/tdastro/sources/static_source.py b/src/tdastro/sources/static_source.py
index bdcaa036..9813f5a6 100644
--- a/src/tdastro/sources/static_source.py
+++ b/src/tdastro/sources/static_source.py
@@ -27,7 +27,7 @@ def __init__(self, brightness, **kwargs):
 
     def __str__(self):
         """Return the string representation of the model."""
-        return "StaticSource(self.brightness)"
+        return f"StaticSource({self.brightness})"
 
     def _evaluate(self, times, wavelengths, **kwargs):
         """Draw effect-free observations for this object.
diff --git a/src/tdastro/sources/step_source.py b/src/tdastro/sources/step_source.py
index 59552c01..7d54ecde 100644
--- a/src/tdastro/sources/step_source.py
+++ b/src/tdastro/sources/step_source.py
@@ -36,7 +36,7 @@ def __init__(self, brightness, t_start, t_end, **kwargs):
 
     def __str__(self):
         """Return the string representation of the model."""
-        return f"StepSource(self.brightness)_{self.t_start}_to_{self.t_end}"
+        return f"StepSource({self.brightness})_{self.t_start}_to_{self.t_end}"
 
     def _evaluate(self, times, wavelengths, **kwargs):
         """Draw effect-free observations for this object.
diff --git a/tests/tdastro/sources/test_spline_source.py b/tests/tdastro/sources/test_spline_source.py
index 7160748a..c91d7503 100644
--- a/tests/tdastro/sources/test_spline_source.py
+++ b/tests/tdastro/sources/test_spline_source.py
@@ -8,6 +8,7 @@ def test_spline_model_flat() -> None:
     wavelengths = np.linspace(100.0, 500.0, 25)
     fluxes = np.full((len(times), len(wavelengths)), 1.0)
     model = SplineModel(times, wavelengths, fluxes)
+    assert str(model) == "SplineModel(None)"
 
     test_times = np.array([0.0, 1.0, 2.0, 3.0, 10.0])
     test_waves = np.array([0.0, 100.0, 200.0, 1000.0])
@@ -17,7 +18,9 @@ def test_spline_model_flat() -> None:
     expected = np.full_like(values, 1.0)
     np.testing.assert_array_almost_equal(values, expected)
 
-    model2 = SplineModel(times, wavelengths, fluxes, amplitude=5.0)
+    model2 = SplineModel(times, wavelengths, fluxes, amplitude=5.0, name="test")
+    assert str(model2) == "SplineModel(test)"
+
     values2 = model2.evaluate(test_times, test_waves)
     assert values2.shape == (5, 4)
     expected2 = np.full_like(values2, 5.0)
diff --git a/tests/tdastro/sources/test_static_source.py b/tests/tdastro/sources/test_static_source.py
index d6950309..834c2899 100644
--- a/tests/tdastro/sources/test_static_source.py
+++ b/tests/tdastro/sources/test_static_source.py
@@ -24,6 +24,7 @@ def test_static_source() -> None:
     assert model.ra is None
     assert model.dec is None
     assert model.distance is None
+    assert str(model) == "StaticSource(10.0)"
 
     times = np.array([1, 2, 3, 4, 5, 10])
     wavelengths = np.array([100.0, 200.0, 300.0])
diff --git a/tests/tdastro/sources/test_step_source.py b/tests/tdastro/sources/test_step_source.py
index c3e9e4ce..98a62f56 100644
--- a/tests/tdastro/sources/test_step_source.py
+++ b/tests/tdastro/sources/test_step_source.py
@@ -41,6 +41,7 @@ def test_step_source() -> None:
     assert model.ra == 1.0
     assert model.dec == 2.0
     assert model.distance == 3.0
+    assert str(model) == "StepSource(15.0)_1.0_to_2.0"
 
     times = np.array([0.0, 1.0, 2.0, 3.0])
     wavelengths = np.array([100.0, 200.0])