diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 000000000..1dcc9a098
Binary files /dev/null and b/.DS_Store differ
diff --git a/Rakefile b/Rakefile
new file mode 100644
index 000000000..deb52f2cd
--- /dev/null
+++ b/Rakefile
@@ -0,0 +1,9 @@
+require 'rake/testtask'
+
+Rake::TestTask.new do |t|
+  t.libs = ["lib"]
+  t.warning = true
+  t.test_files = FileList['specs/*_spec.rb']
+end
+
+task default: :test
diff --git a/design-activity.md b/design-activity.md
new file mode 100644
index 000000000..7e57f49b0
--- /dev/null
+++ b/design-activity.md
@@ -0,0 +1,44 @@
+Prompts
+Once you have read through the above code, add a file to your Hotel project called design-activity.md. This file will be submitted with the rest of this exercise. In that file, please respond to the following prompts:
+
+What classes does each implementation include? Are the lists the same?
+  The two implementations have the same classes; CartEntry, ShoppingCart and Order. The methods within are different.
+
+Write down a sentence to describe each class.
+  CartEntry contains data on each item and its price.
+  ShoppingCart class contains an array of all items.
+  Order gives the total for all items in the Shopping card calculated with sales tax.
+
+How do the classes relate to each other? It might be helpful to draw a diagram on a whiteboard or piece of paper.
+  CartEntry seems to be independent of the two other classes.
+  ShoppingCart seems like it will be a collection of CartEntries.
+  Orders have ShoppingCarts.
+
+What data does each class store? How (if at all) does this differ between the two implementations?
+    CartEntry stores: @unit_price and @quantity
+    ShoppingCart stores: @entries
+    Order stores: @cart and SALES_TAX
+
+What methods does each class have? How (if at all) does this differ between the two implementations?
+  Implementation A: total_price
+  Implementation B: price, price, total_price
+
+Consider the Order#total_price method. In each implementation:
+Is logic to compute the price delegated to "lower level" classes like ShoppingCart and CartEntry, or is it retained in Order?
+  Implementation A: retained in Order
+  Implementation B: Delated to other classes.
+
+Does total_price directly manipulate the instance variables of other classes?
+  Implementation A: Yes
+  Implementation B: No
+
+If we decide items are cheaper if bought in bulk, how would this change the code? Which implementation is easier to modify?
+  We could use a conditional to on quantity and a discount rate or bulk price.
+  Both implementations seems like they are of similar amounts of work to modify.
+
+Which implementation better adheres to the single responsibility principle?
+  Implementation B follows the single responsibility principle more than A.
+
+Bonus question once you've read Metz ch. 3: Which implementation is more loosely coupled?
+  Implementation B is more loosely coupled. 
+Once you've responded to the prompts, git add design-activity.md and git commit!
diff --git a/lib/block.rb b/lib/block.rb
new file mode 100644
index 000000000..7b2c99988
--- /dev/null
+++ b/lib/block.rb
@@ -0,0 +1,24 @@
+ require_relative 'reception'
+
+require 'pry'
+require 'date'
+
+# block is-a reception item
+# block inherits from reception
+
+module Hotel
+  class Block < Reception
+
+    def initialize(check_in, check_out, number_of_rooms)
+      @check_in = check_in
+      @check_out = check_out
+      @number_of_rooms = number_of_rooms
+
+      availability_by_date_range(check_in, check_out)
+    end
+
+    def hold_block
+
+    end
+  end
+end
diff --git a/lib/reception.rb b/lib/reception.rb
new file mode 100644
index 000000000..6754b38ec
--- /dev/null
+++ b/lib/reception.rb
@@ -0,0 +1,61 @@
+require_relative 'reservation'
+require 'pry'
+require 'date'
+
+module Hotel
+  class Reception
+    attr_reader :reservation_list
+    def initialize
+      @reservation_list = []
+    end
+
+# Checks for availabl rooms, assigns room to new_reservation and adds new reservation to reservations array
+    def add_reservation(check_in, check_out)
+
+      assigned_room = availability_by_date_range(check_in, check_out).first
+
+      new_reservation = Hotel::Reservation.new(check_in, check_out, assigned_room)
+      if check_in >= check_out
+        raise ArgumentError.new "invalid date range"
+      end
+
+      @reservation_list << new_reservation
+      return new_reservation
+    end
+
+# Searches through reservatsions to generate reservations for a given day
+    def reservations_by_date(date)
+      reservations_on_date = []
+      @reservation_list.each do |reservation|
+        if reservation.date_range.include? date
+          reservations_on_date << reservation
+        end
+      end
+      return reservations_on_date
+    end
+
+# compares each reservation to date range in question and returns an array of rooms available for the given period.
+    def availability_by_date_range(check_in, check_out)
+        occupied_rooms = []
+        range = (check_in...check_out)#.to_a
+        @reservation_list.each do |reservation|
+          if (range.include? reservation.check_in) || (range.include? reservation.check_out - 1)
+            occupied_rooms << reservation.assigned_room
+          end
+        end
+
+        available_rooms = []
+        ROOMS.each do |room|
+          if !(occupied_rooms.include? room)
+            available_rooms << room
+          end
+        end
+        return available_rooms
+    end
+
+# # Creates room blocks based on availability_by_date_range
+#     def room_block
+#
+#     end
+  end
+end
diff --git a/lib/reservation.rb b/lib/reservation.rb
new file mode 100644
index 000000000..184ca95aa
--- /dev/null
+++ b/lib/reservation.rb
@@ -0,0 +1,38 @@
+# require_relative 'reception'
+require 'pry'
+require 'date'
+
+module Hotel
+  COST = 200
+  ROOMS = Array(1..20)
+  class Reservation
+
+    attr_reader :check_in, :check_out, :assigned_room
+
+    def initialize(check_in, check_out, assigned_room)
+
+      @check_in = check_in
+      @check_out = check_out
+      @assigned_room = assigned_room
+      @range = date_range
+      @length_of_stay = @range.length
+      @total_cost = total_cost
+    end
+
+# Creates array of dates from given check_in and check_out dates
+    def date_range
+      @range = (@check_in...@check_out).to_a
+      return @range
+    end
+
+    def length_of_stay
+       nights = (@check_out - @check_in).to_i
+       return nights
+    end
+
+    def total_cost
+      total_cost = (COST * length_of_stay).to_f.round(2)
+      return total_cost
+    end
+  end
+end
diff --git a/specs/block_spec.rb b/specs/block_spec.rb
new file mode 100644
index 000000000..ea1c13dc2
--- /dev/null
+++ b/specs/block_spec.rb
@@ -0,0 +1,19 @@
+require_relative 'spec_helper'
+require 'pry'
+
+describe 'Bock class' do
+
+  describe "room_block" do
+    it "returns an array with the requeted number of rooms" do
+
+    end
+
+    it "it gives a discoutnd price for reservation" do
+
+    end
+
+    it "it can only be reserved through the block request" do
+      
+    end
+  end
+end
diff --git a/specs/reception_spec.rb b/specs/reception_spec.rb
new file mode 100644
index 000000000..9af368334
--- /dev/null
+++ b/specs/reception_spec.rb
@@ -0,0 +1,81 @@
+
+require_relative 'spec_helper'
+require 'pry'
+
+describe 'Reception class' do
+  before do
+    @receptionist = Hotel::Reception.new
+    @new_reservation = @receptionist.add_reservation(Date.new(2018,3,5), Date.new(2018,3,10))
+  end
+
+  # ***IDEAS*** validate_date check for calendar date, check for date after today, check for valid date_range
+
+  describe "initialize" do
+    it 'creates a new instance of Reception' do
+      @receptionist.must_be_instance_of Hotel::Reception
+    end
+  end
+
+  describe "add_reservation" do
+    it "returns an array of all reservations" do
+      @receptionist.reservation_list.must_be_kind_of Array
+    end
+
+    it "assaigns an available room" do
+      @new_reservation.assigned_room.must_equal 1
+    end
+
+    it "raises an error when date range is invalid" do
+      proc {@receptionist.add_reservation(Date.new(2018,3,11), Date.new(2018,3,5))}.must_raise ArgumentError
+    end
+  end
+
+  describe 'reservation_by_date' do
+    it "returns the number of reservations for given day" do
+      @receptionist.reservations_by_date(Date.new(2018,3,8)).length.must_equal 1
+      @receptionist.reservations_by_date(Date.new(2018,3,6)).length.must_equal 1
+
+      4.times do
+        @receptionist.add_reservation(Date.new(2018,3,5), Date.new(2018,3,10))
+      end
+      @receptionist.reservations_by_date(Date.new(2018,3,6)).length.must_equal 5
+
+      15.times do
+        @receptionist.add_reservation(Date.new(2018,3,5), Date.new(2018,3,10))
+      end
+      @receptionist.reservations_by_date(Date.new(2018,3,6)).length.must_equal 20
+    end
+
+    it 'retruns an empty array when no reservations on given date' do
+      @receptionist.reservations_by_date(Date.new(2018,3,16)).must_equal []
+      @receptionist.reservations_by_date(Date.new(2018,3,16)).must_be_empty
+      @receptionist.reservations_by_date(Date.new(2018,3,4)).must_be_empty
+    end
+  end
+
+  describe "availability_by_date_range" do
+    it "returns an array of all available rooms for given range" do
+      @receptionist.availability_by_date_range(Date.new(2018,3,5), Date.new(2018,3,10)).length.must_equal 19
+
+      4.times do
+        @receptionist.add_reservation(Date.new(2018,3,5), Date.new(2018,3,10))
+      end
+      @receptionist.availability_by_date_range(Date.new(2018,3,5), Date.new(2018,3,10)).length.must_equal 15
+
+    end
+
+    it "returns an empty array if no rooms available for a given date range" do
+      20.times do
+        @receptionist.add_reservation(Date.new(2018,3,5), Date.new(2018,3,10))
+      end
+
+      @receptionist.availability_by_date_range(Date.new(2018,3,5), Date.new(2018,3,10)).must_equal []
+      @receptionist.availability_by_date_range(Date.new(2018,3,5), Date.new(2018,3,10)).must_be_empty
+    end
+
+    it "will return array of all rooms if no bookings during given range" do
+      @receptionist.availability_by_date_range(Date.new(2018,3,11), Date.new(2018,3,21)).length.must_equal 20
+    end
+  end
+
+end
diff --git a/specs/reservation_spec.rb b/specs/reservation_spec.rb
new file mode 100644
index 000000000..f86b9baab
--- /dev/null
+++ b/specs/reservation_spec.rb
@@ -0,0 +1,40 @@
+require_relative 'spec_helper'
+require 'pry'
+
+describe 'Reservation class' do
+
+  before do
+    @new_reservation = Hotel::Reservation.new(Date.new(2018,3,5), Date.new(2018,3,10), 1)
+
+    @room = @new_reservation.assigned_room
+  end
+
+    it "creates a new instance of Reservation" do
+      @new_reservation.must_be_instance_of Hotel::Reservation
+    end
+
+    it "assigns a valid room" do
+      Hotel::ROOMS.must_include @room
+    end
+
+    it "calculates number of nights" do
+      @new_reservation.length_of_stay.must_be_kind_of Integer
+      @new_reservation.length_of_stay.must_equal 5
+
+      Hotel::Reservation.new(Date.new(2018,3,2), Date.new(2018,3,10), 1).length_of_stay.must_equal 8
+
+      # Hotel::Reservation.new(Date.new(2018,3,2), Date.new(2018,3,2), 1).length_of_stay.must_equal 0
+    end
+
+    describe "date_range" do
+      it "calculates accurate date range" do
+        @new_reservation.date_range.must_be_kind_of Array
+      end
+    end
+    it "calculatesthe total cost of stay" do
+      @new_reservation.total_cost.must_be_kind_of Float
+
+      @new_reservation.total_cost.must_be_within_delta 1000, 0.5
+    end
+
+end
diff --git a/specs/spec_helper.rb b/specs/spec_helper.rb
new file mode 100644
index 000000000..0fb7cde1e
--- /dev/null
+++ b/specs/spec_helper.rb
@@ -0,0 +1,15 @@
+require 'time'
+
+require 'simplecov'
+SimpleCov.start
+
+require 'minitest'
+require 'minitest/autorun'
+require 'minitest/reporters'
+# Add simplecov
+
+Minitest::Reporters.use! Minitest::Reporters::SpecReporter.new
+
+# Require_relative your lib files here!
+require_relative '../lib/reservation'
+require_relative '../lib/reception'