diff --git a/notes.md b/notes.md
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@@ -6,12 +6,30 @@ Which class is responsible for each of the following behaviors?
 For each, explain how the behavior is accomplished.
 
 ### Checking to see whether the game is over
+Class TTTGame is responsible for checking to see whether the game is over. 
+To check if the game is over, the is_over method is called with the state
+as the argument.  The is_over method calls board_is_full and check_winner
+for both players. To check if the board is full, True is returned if "-"
+is in the board still. To check if either player is a winnner, the code isn't
+finished, but True should be returned if the board has three of that players
+symbols in a row. All of these methods are in the TTTGame class.
 
 ### Determining which actions are available at a particular state
+Class TTTGame is responsible for determining which actions are available
+at a particular state. It returns a list of the index positions where there
+are empty spaces '-'.
 
 ### Showing the board
+Class TTTView is responsible for showing the board. The methods it uses include 
+print_board, get_action, format_row, and format_value. The TTTView class attributes
+are greeting, goodbye, divider, x_color, o_color, and option color.
 
 ### Choosing which action to play on a turn
+Class TTTHumanPlayer is responsible for choosing which action to play on a turn.
+It gets possible actions (blank spaces)from class TTTGame method get_actions. 
+Then, it converts each of the possible actions into a string and stores as a list
+in choices. Then, it converts input to the "> " prompt to integer and stores in
+action variable and returns action.
 
 
 ## Checkpoint 2 Notes