diff --git a/cohd/cohd_trapi.py b/cohd/cohd_trapi.py
index e38bf2a..80279ea 100644
--- a/cohd/cohd_trapi.py
+++ b/cohd/cohd_trapi.py
@@ -82,6 +82,8 @@ def operate(self):
 
     _INFORES_ID = 'infores:cohd'
     _SERVICE_NAME = 'COHD'
+    _KNOWLEDGE_LEVEL = 'statistical_association'
+    _AGENT_TYPE = 'data_analysis_pipeline'
 
     def _get_kg_predicate(self) -> str:
         """ Determines which predicate should be used to represent the COHD analysis
diff --git a/cohd/cohd_trapi_15.py b/cohd/cohd_trapi_15.py
index a281e19..d842bdf 100644
--- a/cohd/cohd_trapi_15.py
+++ b/cohd/cohd_trapi_15.py
@@ -42,7 +42,7 @@ class CohdTrapi150(CohdTrapi):
     edge_types_negative = ['biolink:negatively_correlated_with']
     default_negative_predicate = edge_types_negative[0]
 
-    tool_version = f'{CohdTrapi._SERVICE_NAME} 6.5.1'
+    tool_version = f'{CohdTrapi._SERVICE_NAME} 6.5.2'
     schema_version = '1.5.0'
     biolink_version = bm_version
 
@@ -1557,13 +1557,13 @@ def _add_kg_edge(self, node_1, node_2, cohd_result):
                     # Knowledge Level
                     {
                         'attribute_type_id': 'biolink:knowledge_level',  
-                        'value': 'statistical_association',
+                        'value': CohdTrapi._KNOWLEDGE_LEVEL,
                         'attribute_source': CohdTrapi._INFORES_ID
                     },
                     # Agent Type
                     {
                         'attribute_type_id': 'biolink:agent_type',  
-                        'value': 'computational_model',
+                        'value': CohdTrapi._AGENT_TYPE,
                         'attribute_source': CohdTrapi._INFORES_ID
                     }
                 ]
@@ -1606,13 +1606,13 @@ def _add_kg_edge(self, node_1, node_2, cohd_result):
                     # Knowledge Level
                     {
                         'attribute_type_id': 'biolink:knowledge_level',  
-                        'value': 'statistical_association',
+                        'value': CohdTrapi._KNOWLEDGE_LEVEL,
                         'attribute_source': CohdTrapi._INFORES_ID
                     },
                     # Agent Type
                     {
                         'attribute_type_id': 'biolink:agent_type',  
-                        'value': 'computational_model',
+                        'value': CohdTrapi._AGENT_TYPE,
                         'attribute_source': CohdTrapi._INFORES_ID
                     }
                 ]
@@ -1662,13 +1662,13 @@ def _add_kg_edge(self, node_1, node_2, cohd_result):
                     # Knowledge Level
                     {
                         'attribute_type_id': 'biolink:knowledge_level',  
-                        'value': 'statistical_association',
+                        'value': CohdTrapi._KNOWLEDGE_LEVEL,
                         'attribute_source': CohdTrapi._INFORES_ID
                     },
                     # Agent Type
                     {
                         'attribute_type_id': 'biolink:agent_type',  
-                        'value': 'computational_model',
+                        'value': CohdTrapi._AGENT_TYPE,
                         'attribute_source': CohdTrapi._INFORES_ID
                     }
                 ]
@@ -1725,13 +1725,13 @@ def _add_kg_edge(self, node_1, node_2, cohd_result):
                     # Knowledge Level
                     {
                         'attribute_type_id': 'biolink:knowledge_level',  
-                        'value': 'statistical_association',
+                        'value': CohdTrapi._KNOWLEDGE_LEVEL,
                         'attribute_source': CohdTrapi._INFORES_ID
                     },
                     # Agent Type
                     {
                         'attribute_type_id': 'biolink:agent_type',  
-                        'value': 'computational_model',
+                        'value': CohdTrapi._AGENT_TYPE,
                         'attribute_source': CohdTrapi._INFORES_ID
                     }
                 ]
@@ -1780,13 +1780,13 @@ def _add_kg_edge(self, node_1, node_2, cohd_result):
                     # Knowledge Level
                     {
                         'attribute_type_id': 'biolink:knowledge_level',  
-                        'value': 'statistical_association',
+                        'value': CohdTrapi._KNOWLEDGE_LEVEL,
                         'attribute_source': CohdTrapi._INFORES_ID
                     },
                     # Agent Type
                     {
                         'attribute_type_id': 'biolink:agent_type',  
-                        'value': 'computational_model',
+                        'value': CohdTrapi._AGENT_TYPE,
                         'attribute_source': CohdTrapi._INFORES_ID
                     }
                 ]
@@ -1794,13 +1794,13 @@ def _add_kg_edge(self, node_1, node_2, cohd_result):
             # Knowledge Level
             {
                 'attribute_type_id': 'biolink:knowledge_level',  
-                'value': 'statistical_association',
+                'value': CohdTrapi._KNOWLEDGE_LEVEL,
                 'attribute_source': CohdTrapi._INFORES_ID
             },
             # Agent Type
             {
                 'attribute_type_id': 'biolink:agent_type',  
-                'value': 'computational_model',
+                'value': CohdTrapi._AGENT_TYPE,
                 'attribute_source': CohdTrapi._INFORES_ID
             }
         ]
@@ -1888,13 +1888,13 @@ def _add_kg_set_edge(self, node_2, is_subject, set_result):
             # Knowledge Level
             {
                 'attribute_type_id': 'biolink:knowledge_level',  
-                'value': 'statistical_association',
+                'value': CohdTrapi._KNOWLEDGE_LEVEL,
                 'attribute_source': CohdTrapi._INFORES_ID
             },
             # Agent Type
             {
                 'attribute_type_id': 'biolink:agent_type',  
-                'value': 'computational_model',
+                'value': CohdTrapi._AGENT_TYPE,
                 'attribute_source': CohdTrapi._INFORES_ID
             },
             # Observed-expected frequency ratio analysis
@@ -1925,13 +1925,13 @@ def _add_kg_set_edge(self, node_2, is_subject, set_result):
                     # Knowledge Level
                     {
                         'attribute_type_id': 'biolink:knowledge_level',  
-                        'value': 'statistical_association',
+                        'value': CohdTrapi._KNOWLEDGE_LEVEL,
                         'attribute_source': CohdTrapi._INFORES_ID
                     },
                     # Agent Type
                     {
                         'attribute_type_id': 'biolink:agent_type',  
-                        'value': 'computational_model',
+                        'value': CohdTrapi._AGENT_TYPE,
                         'attribute_source': CohdTrapi._INFORES_ID
                     }
                 ]