I see what you mean. Actually there is no real change event for the checkbox. With it running on entry it will detect a state change if you click the checkbox. However, if you then change your mind and click it again, your tally will not update. It would be best to run the macro OnEntry and OnExit.
Code:
Sub TallyTicks()
'A basic Word macro coded by Greg Maxey
Dim lngGroup As Long
Dim lngIndex As Long
Dim lngTally As Long
lngGroup = Mid(Selection.FormFields(1).Name, 4, 1)
For lngIndex = 1 To 6
If ActiveDocument.FormFields("grp" & lngGroup & "Chk" & lngIndex).CheckBox.Value = True Then
lngTally = lngTally + 1
End If
Next lngIndex
ActiveDocument.FormFields("grp" & lngGroup & "Tally").Result = CStr(lngTally)
Select Case lngTally
Case 1 To 2
ActiveDocument.FormFields("grp" & lngGroup & "Tally").Range.Font.ColorIndex = wdGreen
MsgBox "A message for this low score."
Case Is > 2
ActiveDocument.FormFields("grp" & lngGroup & "Tally").Range.Font.ColorIndex = wdRed
MsgBox "A message for this higher score"
Case Else
ActiveDocument.FormFields("grp" & lngGroup & "Tally").Range.Font.ColorIndex = wdAuto
End Select
lbl_Exit:
Exit Sub
End Sub