diff --git a/README.md b/README.md
index 25fd4d2a..b6e5c7b2 100644
--- a/README.md
+++ b/README.md
@@ -73,24 +73,23 @@ Create an `Account` class which should have the following functionality:
     **Account ID** - (Fixnum) a unique identifier corresponding to an account
     **Owner ID** - (Fixnum) a unique identifier corresponding to an owner
 
-<!--
 ## Wave 3
-Create a `SavingsAccount` class which should inherit behavior from the `Account` class. It should include updated logic with the following functionality:
-- An updated `initialize` method:
-  - The initial balance cannot be less than $10. If it is, this will `raise` an `ArgumentError`
-- An updated `withdraw` method:
+Create a `SavingsAccount` class which should inherit behavior from the `Account` class. It should include the following updated functionality:
+- The initial balance cannot be less than $10. If it is, this will `raise` an `ArgumentError`
+- Updated withdrawal functionality:
   - Each withdrawal 'transaction' incurs a fee of $2 that is taken out of the balance.
   - Does not allow the account to go below the $10 minimum balance - Will output a warning message and return the original un-modified balance
 
-It should include the following new methods:
+It should include the following new method:
 - `#add_interest(rate)`: Calculate the interest on the balance and add the interest to the balance. Return the **interest** that was calculated and added to the balance (not the updated balance).
   - Input rate is assumed to be a percentage (i.e. 0.25).
   - The formula for calculating interest is `balance * rate/100`
     - Example: If the interest rate is 0.25% and the balance is $10,000, then the interest that is returned is $25 and the new balance becomes $10,025.
 
-Create a `CheckingAccount` class which should inherit behavior from the `Account` class. It should include updated logic with the following functionality:
-- `#withdraw(amount)`: The input amount gets taken out of the account as result of an ATM transaction. Each withdrawal 'transaction' incurs a fee of $1 that is taken out of the balance. Returns the updated account balance.
-  - Does not allow the account to go negative. Will output a warning message and return the original un-modified balance.
+Create a `CheckingAccount` class which should inherit behavior from the `Account` class. It should include the following updated functionality:
+- Updated withdrawal functionality:
+  - Each withdrawal 'transaction' incurs a fee of $1 that is taken out of the balance. Returns the updated account balance.
+    - Does not allow the account to go negative. Will output a warning message and return the original un-modified balance.
 - `#withdraw_using_check(amount)`: The input amount gets taken out of the account as a result of a check withdrawal. Returns the updated account balance.
   - Allows the account to go into overdraft up to -$10 but not any lower
   - The user is allowed three free check uses in one month, but any subsequent use adds a $2 transaction fee
@@ -101,16 +100,15 @@ Create a `CheckingAccount` class which should inherit behavior from the `Account
 
 ## Optional:
 
-Create a `MoneyMarketAccount` class with a minimum of 6 specs. The class should inherit behavior from the `Account` class.
+Create a `MoneyMarketAccount` class which should inherit behavior from the `Account` class.
 - A maximum of 6 transactions (deposits or withdrawals) are allowed per month on this account type
-- `self.new(id, initial_balance)`: creates a new instance with the instance variable `id` and 'initial_balance' assigned
-  - The initial balance cannot be less than $10,000 - this will `raise` an `ArgumentError`
-- `#withdraw(amount)`: The input amount gets taken out of the account as result of an ATM transaction. Returns the updated account balance.
+- The initial balance cannot be less than $10,000 - this will `raise` an `ArgumentError`
+- Updated withdrawal logic:
   - If a withdrawal causes the balance to go below $10,000, a fee of $100 is imposed and no more transactions are allowed until the balance is increased using a deposit transaction.
   - Each transaction will be counted against the maximum number of transactions
-- `#deposit(amount)`. Returns the updated account balance.
+- Updated deposit logic:
   - Each transaction will be counted against the maximum number of transactions
   - Exception to the above: A deposit performed to reach or exceed the minimum balance of $10,000 is not counted as part of the 6 transactions.
-- `#add_interest(rate)`: Calculate the interest on the balance and add the interest to the balance. Return the interest that was calculated and added to the balance (not the updated balance). Note** This is the same as the `SavingsAccount` interest.
+- `#add_interest(rate)`: Calculate the interest on the balance and add the interest to the balance. Return the interest that was calculated and added to the balance (not the updated balance).
+    - Note** This is the same as the `SavingsAccount` interest.
 - `#reset_transactions`: Resets the number of transactions to zero
--->
diff --git a/bank-accounts.rb b/bank-accounts.rb
index 8068530b..34dc7eaa 100644
--- a/bank-accounts.rb
+++ b/bank-accounts.rb
@@ -6,13 +6,15 @@
 module Bank
 
   class Account
+    @@min_balance = 0
+
     attr_reader :balance, :owner, :open_date, :ident
 
-    def initialize(ident, balance, open_date)
+    def initialize(ident, open_date, balance)
       @ident = ident
-      @balance = balance
-      raise ArgumentError.new("Your intial balance can't be negative") if balance < 0
       @open_date = DateTime.strptime(open_date, '%Y-%m-%d %H:%M:%S %z')
+      @balance = balance
+      raise ArgumentError.new("Insufficient initial balance") if balance < @@min_balance
     end
 
     def self.all
@@ -53,8 +55,8 @@ def assign_to_owner(person) # pass in an instance of Owner
     end
 
     def withdraw(withdraw_amount)
-      if @balance - withdraw_amount < 0
-        puts "Insufficient funds. Withdraw denied."
+      if @balance - withdraw_amount < @@min_balance
+        puts "Insufficient new balance. Withdraw denied."
         @balance
       else
         @balance -= withdraw_amount
diff --git a/bank-master.rb b/bank-master.rb
new file mode 100644
index 00000000..d5f70217
--- /dev/null
+++ b/bank-master.rb
@@ -0,0 +1,4 @@
+require "./bank-accounts.rb"
+require "./savings-account.rb"
+require "./checking-account.rb"
+require "./money-market.rb"
diff --git a/checking-account.rb b/checking-account.rb
new file mode 100644
index 00000000..20595aa5
--- /dev/null
+++ b/checking-account.rb
@@ -0,0 +1,35 @@
+module Bank
+  class CheckingAccount < Account
+    attr_reader :used_checks
+
+    def initialize(ident, open_date, balance)
+      super
+      @used_checks = 0
+    end
+
+    def withdraw(withdraw_amount)
+      super(withdraw_amount + 100)
+    end
+
+    def withdraw_using_check(amount)
+      if @balance - amount < -1000
+        puts "Insufficient new balance. Check denied."
+        @balance
+      else
+        @used_checks += 1
+        if @used_checks > 3
+          @balance = @balance - amount - 200
+        else
+          @balance -= amount
+        end
+      end
+    end
+
+    def reset_checks
+      @used_checks = 0
+    end
+
+
+  end
+
+end
diff --git a/money-market.rb b/money-market.rb
new file mode 100644
index 00000000..ad61aaa3
--- /dev/null
+++ b/money-market.rb
@@ -0,0 +1,58 @@
+module Bank
+  class MoneyMarketAccount < Account
+    attr_reader :transactions_permitted, :transaction_count, :balance
+
+    @@min_balance = 1000000
+
+    def initialize(ident, open_date, balance)
+      super
+      @transaction_count = 0
+      @transactions_permitted = true      # this only refers to minimum balance concerns, not to transaction count
+    end
+
+    def withdraw(withdraw_amount)
+      if @balance - withdraw_amount < 0                         # balance can never go negative
+        puts "Insufficient new balance. Withdraw denied."
+        @balance
+      elsif @balance - withdraw_amount < @@min_balance && @transactions_permitted
+        @transactions_permitted = false
+        @balance = @balance - withdraw_amount - 10000
+      elsif
+        @transaction_count < 6 && @transactions_permitted
+        @transaction_count += 1
+        @balance -= withdraw_amount
+      else
+        @balance
+      end
+    end
+
+    def deposit(deposit_amount)
+      if !@transactions_permitted
+        @balance += deposit_amount
+          if @balance >= @@min_balance
+            @transactions_permitted = true
+            @balance
+          else
+            @transactions_permitted = false
+            @balance
+          end
+      elsif @transaction_count < 6
+        @transaction_count += 1
+        @balance += deposit_amount
+      else
+        @balance
+      end
+    end
+
+    def reset_transaction_count
+      @transaction_count = 0
+    end
+
+    def add_interest(rate)
+      interest = @balance * rate/100
+      @balance += interest
+      return interest
+    end
+
+  end
+end
diff --git a/savings-account.rb b/savings-account.rb
new file mode 100644
index 00000000..0d88650f
--- /dev/null
+++ b/savings-account.rb
@@ -0,0 +1,16 @@
+module Bank
+  class SavingsAccount < Account
+    @@min_balance = 1000
+
+    def withdraw(withdraw_amount)
+      super(withdraw_amount + 200)
+    end
+
+    def add_interest(rate)
+      interest = @balance * rate/100
+      @balance += interest
+      return interest
+    end
+
+  end
+end