diff --git a/app/helpers/service_helper.py b/app/helpers/service_helper.py
index f2b521f..399882a 100644
--- a/app/helpers/service_helper.py
+++ b/app/helpers/service_helper.py
@@ -2,7 +2,7 @@ import csv
 import io
 import re
 
-def items_csv_to_dict(items_csv_reader):
+def items_csv_to_dict(items_csv_reader, irt_model):
   items = []
   headers = []
 
@@ -16,7 +16,7 @@ def items_csv_to_dict(items_csv_reader):
       for key, col in enumerate(headers):
         if key == 0:
           item[col] = row[key]
-        # b param
+        # b param - tmep fix! use irt model b param for proper reference
         elif key == (1 - len(headers)):
           item['b_param'] = row[key]
         elif key > 1:
@@ -25,7 +25,7 @@ def items_csv_to_dict(items_csv_reader):
             'value': row[key],
             'type': 'metadata'
           })
-      print(row(1 - len(headers)))
+
       items.append(item)
 
   return items
diff --git a/app/models/constraint.py b/app/models/constraint.py
index 2c84a60..28a3939 100644
--- a/app/models/constraint.py
+++ b/app/models/constraint.py
@@ -1,5 +1,4 @@
 from pydantic import BaseModel
-from typing import Optional
 
 from models.attribute import Attribute
 
diff --git a/app/models/irt_model.py b/app/models/irt_model.py
index 4751ba9..2596686 100644
--- a/app/models/irt_model.py
+++ b/app/models/irt_model.py
@@ -1,7 +1,8 @@
 from pydantic import BaseModel
+from typing import Dict
 
 class IRTModel(BaseModel):
   a_param: float
-  b_param: float
+  b_param: Dict = {"schema_bson_id": str, "field_bson_id": str}
   c_param: float
   model: str
diff --git a/app/services/loft_service.py b/app/services/loft_service.py
index af800a2..07bfe2a 100644
--- a/app/services/loft_service.py
+++ b/app/services/loft_service.py
@@ -33,7 +33,7 @@ class LoftService(Base):
     items_csv_reader = csv_helper.file_stream_reader(items_csv)
 
     # add items to attributes dict
-    attributes['items'] = service_helper.items_csv_to_dict(items_csv_reader)
+    attributes['items'] = service_helper.items_csv_to_dict(items_csv_reader, attributes['irt_model'])
     logging.info('Processed Attributes...')
 
     return attributes