diff --git a/.gitignore b/.gitignore
index 8bd33662..a5618684 100644
--- a/.gitignore
+++ b/.gitignore
@@ -131,3 +131,4 @@ dmypy.json
 # test files
 input_file.yaml
 **/*.nc
+!tests/**/*.nc
diff --git a/decoimpact/business/entities/rules/multiply_rule.py b/decoimpact/business/entities/rules/multiply_rule.py
index 8fb3459b..176d5849 100644
--- a/decoimpact/business/entities/rules/multiply_rule.py
+++ b/decoimpact/business/entities/rules/multiply_rule.py
@@ -22,8 +22,9 @@ def __init__(
         input_variable_names: List[str],
         multipliers: List[float],
         output_variable_name: str = "output",
+        description: str = "",
     ):
-        super().__init__(name, input_variable_names, output_variable_name)
+        super().__init__(name, input_variable_names, output_variable_name, description)
         self._multipliers = multipliers
 
     @property
diff --git a/decoimpact/business/entities/rules/rule_base.py b/decoimpact/business/entities/rules/rule_base.py
index 58f2b3e4..14e84c16 100644
--- a/decoimpact/business/entities/rules/rule_base.py
+++ b/decoimpact/business/entities/rules/rule_base.py
@@ -20,10 +20,11 @@ def __init__(
         name: str,
         input_variable_names: List[str],
         output_variable_name: str = "output",
+        description: str = ""
     ):
 
         self._name = name
-        self._description = ""
+        self._description = description
         self._input_variable_names = input_variable_names
         self._output_variable_name = output_variable_name
 
diff --git a/decoimpact/data/api/i_rule_data.py b/decoimpact/data/api/i_rule_data.py
index 3a39acab..2eab827e 100644
--- a/decoimpact/data/api/i_rule_data.py
+++ b/decoimpact/data/api/i_rule_data.py
@@ -17,6 +17,11 @@ class IRuleData(ABC):
     def name(self) -> str:
         """Name of the rule"""
 
+    @property
+    @abstractmethod
+    def description(self) -> str:
+        """Description of the rule"""
+
     @property
     @abstractmethod
     def output_variable(self) -> str:
diff --git a/decoimpact/data/entities/dataset_data.py b/decoimpact/data/entities/dataset_data.py
index 32f9735e..3a249765 100644
--- a/decoimpact/data/entities/dataset_data.py
+++ b/decoimpact/data/entities/dataset_data.py
@@ -22,7 +22,7 @@ def __init__(self, dataset: dict[str, Any]):
         """Create DatasetData based on provided info dictionary
 
         Args:
-            info (dict[str, Any]):
+            dataset (dict[str, Any]):
         """
         super()
         self._path = Path(get_dict_element("filename", dataset)).resolve()
@@ -54,13 +54,12 @@ def _get_original_dataset(self) -> _xr.Dataset:
             raise NotImplementedError(message)
 
         try:
-            dataset: _xr.Dataset = _xr.open_dataset(self._path,
-                                                    mask_and_scale=True)
+            dataset: _xr.Dataset = _xr.open_dataset(self._path, mask_and_scale=True)
             # mask_and_scale argument is needed to prevent inclusion of NaN's
             # in dataset for missing values. This inclusion converts integers
             # to floats
-        except OSError as exc:
+        except ValueError as exc:
             msg = "ERROR: Cannot open input .nc file -- " + str(self._path)
-            raise OSError(msg) from exc
+            raise ValueError(msg) from exc
 
         return dataset
diff --git a/decoimpact/data/entities/model_data_builder.py b/decoimpact/data/entities/model_data_builder.py
index 003853f9..07b36638 100644
--- a/decoimpact/data/entities/model_data_builder.py
+++ b/decoimpact/data/entities/model_data_builder.py
@@ -19,16 +19,12 @@ class ModelDataBuilder:
     read from the input file to Rule and DatasetData objects)"""
 
     def __init__(self) -> None:
-        """"""
+        """Create ModelDataBuilder"""
         self._rule_parsers = list(rule_parsers())
 
     def parse_yaml_data(self, contents: dict[Any, Any]) -> IModelData:
-        """_summary_
-        Args:
-            contents (dict[Any, Any]): _description_
-        Returns:
-            IModelData: _description_
-        """
+        """Parse the Yaml input file into a data object"""
+        print('contennts', contents)
 
         datasets = list(self._parse_datasets(contents))
         rules = list(self._parse_rules(contents))
diff --git a/decoimpact/data/entities/multiply_rule_data.py b/decoimpact/data/entities/multiply_rule_data.py
index 9e421783..7d8cf329 100644
--- a/decoimpact/data/entities/multiply_rule_data.py
+++ b/decoimpact/data/entities/multiply_rule_data.py
@@ -20,9 +20,10 @@ def __init__(
         name: str,
         multipliers: List[float],
         input_variable: str,
-        output_variable: str,
+        output_variable: str = "output",
+        description: str = ""
     ):
-        super().__init__(name, output_variable)
+        super().__init__(name, output_variable, description)
         self._input_variable = input_variable
         self._multipliers = multipliers
 
diff --git a/decoimpact/data/entities/rule_data.py b/decoimpact/data/entities/rule_data.py
index 02799d18..d7f92387 100644
--- a/decoimpact/data/entities/rule_data.py
+++ b/decoimpact/data/entities/rule_data.py
@@ -13,7 +13,9 @@
 class RuleData(IRuleData):
     """Class for storing rule information"""
 
-    def __init__(self, name: str, output_variable: str):
+    def __init__(
+        self, name: str, output_variable: str = "output", description: str = ""
+    ):
         """Create RuleData based on provided info dictionary
 
         Args:
@@ -21,6 +23,7 @@ def __init__(self, name: str, output_variable: str):
         """
         super()
         self._name = name
+        self._description = description
         self._output_variable = output_variable
 
     @property
@@ -28,7 +31,13 @@ def name(self) -> str:
         """Name to the rule"""
         return self._name
 
+    @property
+    def description(self) -> str:
+        """Description of the rule"""
+        return self._description
+
     @property
     def output_variable(self) -> str:
         """Data of the rule data"""
         return self._output_variable
+
diff --git a/decoimpact/data/parsers/parser_multiply_rule.py b/decoimpact/data/parsers/parser_multiply_rule.py
index 235d2288..eb0f97dd 100644
--- a/decoimpact/data/parsers/parser_multiply_rule.py
+++ b/decoimpact/data/parsers/parser_multiply_rule.py
@@ -2,7 +2,7 @@
 Module for ParserMultiplyRule class
 
 Classes:
-    MultiplyRuleParser
+    ParserMultiplyRule
 """
 from typing import Any, Dict
 
@@ -32,6 +32,11 @@ def parse_dict(self, dictionary: Dict[str, Any]) -> IRuleData:
         name = get_dict_element("name", dictionary)
         input_variable_name = get_dict_element("input_variable", dictionary)
         multipliers = get_dict_element("multipliers", dictionary)
+
+        if not all(isinstance(m, (int, float)) for m in multipliers):
+            message = f"""Multipliers should be a list of floats, \
+                          received: {multipliers}"""
+            raise ValueError(message)
         output_variable_name = get_dict_element("output_variable", dictionary)
 
         return MultiplyRuleData(
diff --git a/tests/business/entities/rules/test_multiply_rule.py b/tests/business/entities/rules/test_multiply_rule.py
index 20007fc1..57ffc6e8 100644
--- a/tests/business/entities/rules/test_multiply_rule.py
+++ b/tests/business/entities/rules/test_multiply_rule.py
@@ -26,7 +26,7 @@ def test_execute_value_array_multiplied_by_multipliers():
     """Test setting input_variable_names of a RuleBase"""
 
     # Arrange & Act
-    rule = MultiplyRule("test", ["foo"], [0.5, 4.0])
+    rule = MultiplyRule("test", ["foo"], [0.5, 4.0], "description")
     data = [1, 2, 3, 4]
     value_array = _xr.DataArray(data)
     multiplied_array = rule.execute(value_array)
diff --git a/tests/business/entities/test_rule_based_model.py b/tests/business/entities/test_rule_based_model.py
index bb40ee10..2a0f6ad3 100644
--- a/tests/business/entities/test_rule_based_model.py
+++ b/tests/business/entities/test_rule_based_model.py
@@ -31,6 +31,19 @@ def test_create_rule_based_model_with_defaults():
     assert model.status == ModelStatus.CREATED
 
 
+def test_status_setter():
+    # Arrange
+    rule = Mock(IRule)
+    dataset = Mock(IDatasetData)
+
+    # Act
+    model = RuleBasedModel([dataset], [rule])
+
+    assert model.status == ModelStatus.CREATED
+    model.status = ModelStatus.EXECUTED
+    assert model.status == ModelStatus.EXECUTED
+
+
 def test_validation_of_rule_based_model():
     """Test if the model correctly validates for required
     parameters (datasets, rules)
diff --git a/tests/business/workflow/test_model_factory.py b/tests/business/workflow/test_model_factory.py
index 1d2339bd..e6ba6706 100644
--- a/tests/business/workflow/test_model_factory.py
+++ b/tests/business/workflow/test_model_factory.py
@@ -74,7 +74,5 @@ def test_create_rule_based_model_with_non_supported_rule():
     exception_raised = exc_info.value
 
     # Assert
-    expected_message = "The rule type of rule 'test' is currently "\
-                    "not implemented"
+    expected_message = "The rule type of rule 'test' is currently " "not implemented"
     assert exception_raised.args[0] == expected_message
-
diff --git a/tests/data/entities/test_dataset_data.py b/tests/data/entities/test_dataset_data.py
index 06e64244..fec4b0a8 100644
--- a/tests/data/entities/test_dataset_data.py
+++ b/tests/data/entities/test_dataset_data.py
@@ -2,6 +2,8 @@
 Tests for DatasetData class
 """
 
+from pathlib import Path
+
 import pytest
 import xarray as _xr
 
@@ -86,3 +88,27 @@ def test_dataset_data_get_input_dataset_should_check_if_extension_is_correct():
     assert exception_raised.args[0].endswith(
         "Currently only UGrid (NetCDF) files are supported."
     )
+
+
+def test_dataset_data_get_input_dataset_should_not_read_incorrect_file():
+    """When calling get_input_dataset on a dataset should
+    read the specified IDatasetData.path. If the file is not correct (not
+    readable), raise OSError.
+    """
+
+    # Arrange
+    path = get_test_data_path() + "/FlowFM_net_incorrect.nc"
+    data_dict = {"filename": path, "variable_mapping": {"test": "test_new"}}
+    data = DatasetData(data_dict)
+
+    # Act
+    with pytest.raises(ValueError) as exc_info:
+        data.get_input_dataset()
+
+    exception_raised = exc_info.value
+    # Assert
+
+    path = Path(path).resolve()
+    assert exception_raised.args[0].endswith(
+        f"ERROR: Cannot open input .nc file -- " + str(path)
+    )
diff --git a/tests/data/entities/test_dataset_data_data/FlowFM_net_incorrect.nc b/tests/data/entities/test_dataset_data_data/FlowFM_net_incorrect.nc
new file mode 100644
index 00000000..e8b5ceab
--- /dev/null
+++ b/tests/data/entities/test_dataset_data_data/FlowFM_net_incorrect.nc
@@ -0,0 +1 @@
+test incorrect nc
diff --git a/tests/data/entities/test_model_data_builder.py b/tests/data/entities/test_model_data_builder.py
new file mode 100644
index 00000000..ae789b9f
--- /dev/null
+++ b/tests/data/entities/test_model_data_builder.py
@@ -0,0 +1,56 @@
+"""
+Tests for ModelDataBuilder class
+"""
+
+import pytest
+
+from decoimpact.data.api.i_model_data import IModelData
+from decoimpact.data.entities.model_data_builder import ModelDataBuilder
+
+contents = dict(
+    {
+        "input-data": [
+            {"dataset": {"filename": "test", "variabel_mapping": {"foo": "bar"}}}
+        ],
+        "rules": [
+            {
+                "multiply_rule": {
+                    "name": "testrule",
+                    "description": "testdescription",
+                    "multipliers": [1, 2.0],
+                    "input_variable": "testin",
+                    "output_variable": "testout",
+                }
+            }
+        ],
+    }
+)
+
+
+def test_model_data_builder_parse_dict_to_model_data():
+    """The ModelDataBuilder should parse the provided dictionary
+    to a IModelData object"""
+
+    # Act
+    data = ModelDataBuilder()
+
+    parsed_data = data.parse_yaml_data(contents)
+    assert isinstance(parsed_data, IModelData)
+
+
+def test_model_data_builder_gives_error_when_rule_not_defined():
+    """The ModelDataBuilder should parse the provided dictionary
+    to a IModelData object"""
+
+    # Act
+    data = ModelDataBuilder()
+    contents["rules"] = [{"wrong_rule": "test"}]
+
+    with pytest.raises(KeyError) as exc_info:
+        data.parse_yaml_data(contents)
+
+    exception_raised = exc_info.value
+
+    # Assert
+    exc = exception_raised.args[0]
+    assert exc.endswith(f"No parser for wrong_rule")
diff --git a/tests/data/entities/test_multiply_rule_data.py b/tests/data/entities/test_multiply_rule_data.py
new file mode 100644
index 00000000..74150637
--- /dev/null
+++ b/tests/data/entities/test_multiply_rule_data.py
@@ -0,0 +1,20 @@
+"""
+Tests for MultiplyRuleData class
+"""
+
+from decoimpact.data.api.i_rule_data import IRuleData
+from decoimpact.data.entities.multiply_rule_data import MultiplyRuleData
+
+
+def test_multiply_rule_data_creation_logic():
+    """The MultiplyRuleData should parse the provided dictionary
+    to correctly initialize itself during creation"""
+
+    # Act
+    data = MultiplyRuleData("test_name", [1.0, 2.0], "input", "output", "description")
+
+    # Assert
+
+    assert isinstance(data, IRuleData)
+    assert data.input_variable == "input"
+    assert data.multipliers == [1.0, 2.0]
diff --git a/tests/data/entities/test_rule_data.py b/tests/data/entities/test_rule_data.py
index 5a914405..2d6ff65d 100644
--- a/tests/data/entities/test_rule_data.py
+++ b/tests/data/entities/test_rule_data.py
@@ -11,10 +11,11 @@ def test_rule_data_creation_logic():
     to correctly initialize itself during creation"""
 
     # Act
-    data = RuleData("test_name", "foo")
+    data = RuleData("test_name", output_variable="foo")
 
     # Assert
 
     assert isinstance(data, IRuleData)
     assert data.name == "test_name"
+    assert data.description == ""
     assert data.output_variable == "foo"
diff --git a/tests/data/entities/test_yaml_model_data.py b/tests/data/entities/test_yaml_model_data.py
index 2bf7ba01..a1c44cbf 100644
--- a/tests/data/entities/test_yaml_model_data.py
+++ b/tests/data/entities/test_yaml_model_data.py
@@ -3,7 +3,13 @@
 """
 
 
+from unittest.mock import Mock
+
+from decoimpact.data.api.i_dataset import IDatasetData
 from decoimpact.data.api.i_model_data import IModelData
+from decoimpact.data.api.i_rule_data import IRuleData
+from decoimpact.data.entities.dataset_data import DatasetData
+from decoimpact.data.entities.multiply_rule_data import MultiplyRuleData
 from decoimpact.data.entities.yaml_model_data import YamlModelData
 
 
@@ -12,8 +18,8 @@ def test_yaml_model_data_default_settings_and_type():
     interface and gives the right default settings"""
 
     # Arrange
-    datasets = []
-    rules = []
+    datasets = [Mock(DatasetData)]
+    rules = [Mock(MultiplyRuleData)]
 
     # Act
     model_data = YamlModelData("Model 1", datasets, rules)
@@ -24,3 +30,7 @@ def test_yaml_model_data_default_settings_and_type():
     assert isinstance(model_data, IModelData)
 
     assert model_data.name == "Model 1"
+    assert model_data.datasets == datasets
+    assert isinstance(model_data.datasets[0], IDatasetData)
+    assert model_data.rules == rules
+    assert isinstance(model_data.rules[0], IRuleData)
diff --git a/tests/data/parsers/test_parser_multiply_rule.py b/tests/data/parsers/test_parser_multiply_rule.py
new file mode 100644
index 00000000..69b93440
--- /dev/null
+++ b/tests/data/parsers/test_parser_multiply_rule.py
@@ -0,0 +1,90 @@
+"""
+Tests for ParserMultiplyRule class
+"""
+
+import pytest
+
+from decoimpact.data.api.i_rule_data import IRuleData
+from decoimpact.data.parsers.i_parser_rule_base import IParserRuleBase
+from decoimpact.data.parsers.parser_multiply_rule import ParserMultiplyRule
+
+
+def test_parser_multiply_rule_creation_logic():
+    """The ParserMultiplyRule should parse the provided dictionary
+    to correctly initialize itself during creation"""
+
+    # Act
+    data = ParserMultiplyRule()
+
+    # Assert
+
+    assert isinstance(data, IParserRuleBase)
+    assert data.rule_type_name == "multiply_rule"
+
+
+def test_parse_dict_to_rule_data_logic():
+    """Test if a correct dictionary is parsed into a RuleData object"""
+    # Arrange
+    contents = dict(
+        {
+            "name": "testname",
+            "input_variable": "input",
+            "multipliers": [0.0, 1.0],
+            "output_variable": "output",
+        }
+    )
+
+    # Act
+    data = ParserMultiplyRule()
+    parsed_dict = data.parse_dict(contents)
+
+    assert isinstance(parsed_dict, IRuleData)
+
+
+def test_parse_wrong_dict_to_rule_data_logic():
+    """Test if an incorrect dictionary is not parsed"""
+    # Arrange
+    contents = dict(
+        {
+            "name": "testname",
+            "input_variable": "input",
+            "output_variable": "output",
+        }
+    )
+
+    # Act
+    data = ParserMultiplyRule()
+
+    with pytest.raises(AttributeError) as exc_info:
+        data.parse_dict(contents)
+
+    exception_raised = exc_info.value
+
+    # Assert
+    expected_message = "Missing element multipliers"
+    assert exception_raised.args[0] == expected_message
+
+
+def test_parse_multipliers_type():
+    """Test if an incorrect dictionary is not parsed"""
+    # Arrange
+    contents = dict(
+        {
+            "name": "testname",
+            "input_variable": "input",
+            "multipliers": ["a", "b", 2],
+            "output_variable": "output",
+        }
+    )
+
+    # Act
+    data = ParserMultiplyRule()
+    with pytest.raises(ValueError) as exc_info:
+        data.parse_dict(contents)
+
+    exception_raised = exc_info.value
+
+    # Assert
+    expected_message = "Multipliers should be a list of floats, \
+                          received: ['a', 'b', 2]"
+    assert exception_raised.args[0] == expected_message