diff --git a/backend/configuration.py b/backend/configuration.py
index e8a5be6c..7c1dee7f 100644
--- a/backend/configuration.py
+++ b/backend/configuration.py
@@ -71,6 +71,14 @@ class BaseConfiguration:
         },
     )
 
+    # Tilføj denne nye parameter for fagspecifik søgning
+    fag: Optional[str] = field(
+        default=None,
+        metadata={
+            "description": "Fagområde for søgning (fx 'jura', 'matematik'). Bestemmer hvilken kollektion der søges i."
+        },
+    )
+
     @classmethod
     def from_runnable_config(
         cls: Type[T], config: Optional[RunnableConfig] = None
@@ -91,4 +99,4 @@ def from_runnable_config(
         return cls(**{k: v for k, v in configurable.items() if k in _fields})
 
 
-T = TypeVar("T", bound=BaseConfiguration)
+T = TypeVar("T", bound=BaseConfiguration)
\ No newline at end of file
diff --git a/backend/retrieval.py b/backend/retrieval.py
index 585a29b5..9488dd8a 100644
--- a/backend/retrieval.py
+++ b/backend/retrieval.py
@@ -1,6 +1,6 @@
 import os
 from contextlib import contextmanager
-from typing import Iterator
+from typing import Iterator, Optional
 
 import weaviate
 from langchain_core.embeddings import Embeddings
@@ -35,9 +35,23 @@ def make_weaviate_retriever(
         ),
         skip_init_checks=True,
     ) as weaviate_client:
+        # Få fag fra konfigurationen, hvis det findes
+        fag = getattr(configuration, 'fag', None)
+        
+        # Bestem collection navnet baseret på fag eller brug fallback
+        if fag:
+            # Brug fagspecifik collection
+            collection_name = f"{fag}_Pensum"
+        else:
+            # Fallback: Brug miljøvariabel eller konstant
+            collection_name = os.environ.get("WEAVIATE_INDEX_NAME", WEAVIATE_DOCS_INDEX_NAME)
+            
+        # Brug den bestemte collection
+        print(f"Søger i collection: {collection_name}")
+        
         store = WeaviateVectorStore(
             client=weaviate_client,
-            index_name=WEAVIATE_DOCS_INDEX_NAME,
+            index_name=collection_name,  # Nu bruger vi det dynamiske collection navn
             text_key="text",
             embedding=embedding_model,
             attributes=["source", "title"],
@@ -63,4 +77,4 @@ def make_retriever(
                 "Unrecognized retriever_provider in configuration. "
                 f"Expected one of: {', '.join(BaseConfiguration.__annotations__['retriever_provider'].__args__)}\n"
                 f"Got: {configuration.retriever_provider}"
-            )
+            )
\ No newline at end of file