diff --git a/library/src/iqb/calculator.py b/library/src/iqb/calculator.py
index e9f5611..4fb1ed9 100644
--- a/library/src/iqb/calculator.py
+++ b/library/src/iqb/calculator.py
@@ -79,20 +79,9 @@ def calculate_binary_requirement_score(self, network_requirement, value, thresho
                 f"The binary requirement score method is not implemented for the network_requirement: {network_requirement}"
             )
 
-    def calculate_iqb_score(self, data=None, print_details=False):
+    def calculate_iqb_score(self, data, print_details=False):
         """Calculates IQB score based on given data."""
 
-        # TODO(bassosimone): remove the default data sample in a subsequent interation.
-        sample_data = {
-            "m-lab": {
-                "download_throughput_mbps": 15,
-                "upload_throughput_mbps": 20,
-                "latency_ms": 75,
-                "packet_loss": 0.007,
-            }
-        }
-        data = sample_data if data is None else data
-
         # TODO(bassosimone): remove printing from the current function and instead
         # add more tests to gain better confidence about it being WAI
         doprint = print if print_details else lambda *args, **kwargs: None
diff --git a/library/tests/iqb/calculator_test.py b/library/tests/iqb/calculator_test.py
index 9a11762..aace54d 100644
--- a/library/tests/iqb/calculator_test.py
+++ b/library/tests/iqb/calculator_test.py
@@ -90,41 +90,42 @@ def test_invalid_network_requirement_raises_error(self):
 class TestIQBCalculatorScoreCalculation:
     """Tests for IQBCalculator score calculation."""
 
+    _SAMPLE_DATA = {
+        "m-lab": {
+            "download_throughput_mbps": 15,
+            "upload_throughput_mbps": 20,
+            "latency_ms": 75,
+            "packet_loss": 0.007,
+        }
+    }
+
     def test_calculate_iqb_score_default_data(self):
-        """Test that IQBCalculator score can be calculated with default data."""
+        """Test that IQBCalculator score can be calculated with explicit input data."""
         iqb = IQBCalculator(name="test1")
-        score = iqb.calculate_iqb_score()
+        score = iqb.calculate_iqb_score(data=self._SAMPLE_DATA)
         # The score should be a float between 0 and 1
         assert isinstance(score, (int, float))
         assert 0 <= score <= 1
 
     def test_calculate_iqb_score_with_custom_data(self):
-        """Test that passing custom data raises NotImplementedError."""
-        iqb = IQBCalculator()
-        sample_data = {
-            "m-lab": {
-                "download_throughput_mbps": 15,
-                "upload_throughput_mbps": 20,
-                "latency_ms": 75,
-                "packet_loss": 0.007,
-            }
-        }
-        score = iqb.calculate_iqb_score(data=sample_data)
+        """Test that IQBCalculator score can be calculated with custom data."""
+        iqb = IQBCalculator()
+        score = iqb.calculate_iqb_score(data=self._SAMPLE_DATA)
         assert isinstance(score, (int, float))
         assert 0 <= score <= 1
 
     def test_calculate_iqb_score_print_details(self):
         """Test that IQBCalculator score calculation works with print_details=True."""
         iqb = IQBCalculator()
-        score = iqb.calculate_iqb_score(print_details=True)
+        score = iqb.calculate_iqb_score(data=self._SAMPLE_DATA, print_details=True)
         assert isinstance(score, (int, float))
         assert 0 <= score <= 1
 
     def test_calculate_iqb_score_consistency(self):
         """Test that IQBCalculator score calculation is consistent across calls."""
         iqb = IQBCalculator()
-        score1 = iqb.calculate_iqb_score()
-        score2 = iqb.calculate_iqb_score()
+        score1 = iqb.calculate_iqb_score(data=self._SAMPLE_DATA)
+        score2 = iqb.calculate_iqb_score(data=self._SAMPLE_DATA)
         assert score1 == score2