diff --git a/integrator/scripts/sources/ofsted.py b/integrator/scripts/sources/ofsted.py
index 561b9d4..eee65ef 100644
--- a/integrator/scripts/sources/ofsted.py
+++ b/integrator/scripts/sources/ofsted.py
@@ -228,15 +228,34 @@ def _parse_date(val) -> date | None:
 
 
 def _detect_framework(df: pd.DataFrame) -> str:
-    """Return 'ReportCard' if new-format columns are present, else 'OEIF'."""
-    rc_indicators = [
-        "inclusion", "curriculum and teaching", "achievement",
-        "attendance and behaviour", "safeguarding standards", "safeguarding",
-    ]
+    """Return 'ReportCard' if new-format columns are present, else 'OEIF'.
+
+    Strategy: check for OEIF-specific phrases first (positive evidence of the
+    old format). Only if none are found, look for RC-specific phrases.
+    Defaults to 'OEIF' so misdetection is always a safe fallback.
+    """
     cols_lower = {c.lower() for c in df.columns}
+
+    # Phrases unique to the old OEIF CSV — if any present, it's OEIF.
+    oeif_indicators = [
+        "overall effectiveness",
+        "quality of education",
+        "behaviour and attitudes",
+    ]
+    for indicator in oeif_indicators:
+        if any(indicator in c for c in cols_lower):
+            return "OEIF"
+
+    # Phrases unique to the new Report Card CSV — multi-word, RC-specific.
+    rc_indicators = [
+        "curriculum and teaching",
+        "leadership and governance",
+        "attendance and behaviour",
+    ]
     for indicator in rc_indicators:
         if any(indicator in c for c in cols_lower):
             return "ReportCard"
+
     return "OEIF"