diff --git a/exp/annotations.py b/exp/annotations.py
--- a/exp/annotations.py
+++ b/exp/annotations.py
@@ -10,12 +10,22 @@ from analyzer.corners import Corners
 
 
 class Board:
+	labels=["UNSET","CLEAR","GOOD","POOR"]
+	UNSET=0
+	CLEAR=1
+	GOOD=2
+	POOR=3
+
 	def __init__(self,**kwargs):
 		self.board=Corners(kwargs.get("board") or [])
 		self.grid=Corners(kwargs.get("grid") or [])
+		self.grade=kwargs.get("grade") or Board.UNSET
 
 	def isEmpty(self):
-		return len(self.board)==0 and len(self.grid)==0
+		return len(self.board)==0 and len(self.grid)==0 and self.grade==Board.UNSET
+
+	def setGrade(self,g):
+		self.grade=g
 
 
 class DataFile(MutableMapping):
@@ -36,7 +46,7 @@ class DataFile(MutableMapping):
 		if isinstance(obj,EPoint):
 			return {"type": "EPoint", "val": [obj.x,obj.y]}
 		elif isinstance(obj,Board):
-			return {"type": "Board", "val": {"board": list(obj.board), "grid": list(obj.grid)}}
+			return {"type": "Board", "val": {"board": list(obj.board), "grid": list(obj.grid), "grade": obj.grade}}
 		raise TypeError(obj)
 
 	def deserialize(self,obj):