diff --git a/pyproject.toml b/pyproject.toml
index 6b82ec3cc..fcdd5f863 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -102,6 +102,8 @@ dependencies = [
 
 [tool.hatch.envs.test.scripts]
 install = "make PREFIX=$VIRTUAL_ENV install"
+devinstall = "pip install -U pip && pip install -e ."
+dotest = "pytest {args}"
 clean-test = "rm -f .coverage* cobertura.xml && rm -fr .pytest_cache"
 run-unit = "pytest -m unit --no-cov --cache-clear tests"
 run-integration = "pytest -m integration --no-cov --cache-clear tests"
diff --git a/src/ramstk/analyses/fha.py b/src/ramstk/analyses/fha.py
index b7a84d42a..d48a07164 100644
--- a/src/ramstk/analyses/fha.py
+++ b/src/ramstk/analyses/fha.py
@@ -69,7 +69,11 @@ def calculate_hri(probability: str, severity: str) -> int:
         return PROBABILITY[probability] * SEVERITY[severity]
     except KeyError as _error:
         raise OutOfRangeError(
-            (f"Unknown hazard probability ({probability}) or severity ({severity}).")
+            (
+                f"Invalid hazard input: probability ({probability}) or severity "
+                f"({severity}) not recognized.  Expected ranges: probability 1-5, "
+                f"severity I-IV."
+            )
         ) from _error
 
 
diff --git a/tests/analyses/test_fha.py b/tests/analyses/test_fha.py
index f15ea3a51..83184180d 100644
--- a/tests/analyses/test_fha.py
+++ b/tests/analyses/test_fha.py
@@ -59,7 +59,8 @@ def test_calculate_hri_unknown_probability():
     with pytest.raises(OutOfRangeError) as e:
         fha.calculate_hri("shibboly-biboly-boo", "Medium")
     assert e.value.args[0] == (
-        "Unknown hazard probability (shibboly-biboly-boo) or severity (Medium)."
+        "Invalid hazard input: probability (shibboly-biboly-boo) or severity (Medium) "
+        "not recognized.  Expected ranges: probability 1-5, severity I-IV."
     )
 
 
@@ -71,7 +72,9 @@ def test_calculate_hri_unknown_severity():
     with pytest.raises(OutOfRangeError) as e:
         fha.calculate_hri("Level A - Frequent", "shibboly-biboly-boo")
     assert e.value.args[0] == (
-        "Unknown hazard probability (Level A - Frequent) or severity (shibboly-biboly-boo)."
+        "Invalid hazard input: probability (Level A - Frequent) or severity "
+        "(shibboly-biboly-boo) not recognized.  Expected ranges: probability 1-5, "
+        "severity I-IV."
     )
 
 
@@ -242,9 +245,9 @@ def test_calculate_hri_non_string_input():
 @pytest.mark.unit
 @pytest.mark.calculation
 def test_set_user_defined_function_invalid_equation():
-    """calculate_user_defined() should raise a SympifyError for invalid equations."""
+    """calculate_user_defined() should raise a ValueError for invalid equations."""
     with pytest.raises(ValueError):
-        _fha = fha.set_user_defined_functions(TEST_FHA, ["uf1+uf2", "invalid_equation"])
+        fha.set_user_defined_functions(TEST_FHA, ["uf1+uf2", "invalid_equation"])
 
 
 @pytest.mark.unit