diff --git a/lib/far_mar/market.rb b/lib/far_mar/market.rb
index 5be343e9..937abcd1 100644
--- a/lib/far_mar/market.rb
+++ b/lib/far_mar/market.rb
@@ -1,4 +1,45 @@
+require 'csv'
+
 module FarMar
   class Market
+    attr_accessor :id, :name, :address, :city, :county, :state, :zip
+    def initialize(id, name, address, city, county, state, zip)
+      @id = id.to_i
+      @name = name
+      @address = address
+      @city = city
+      @county = county
+      @state = state
+      @zip = zip
+    end
+
+    def self.all
+      #returns a collection of Market instances, representing all of the markets described in the CSV
+      market_array = []
+      read_file = CSV.read("./support/markets.csv")
+      read_file.each do |market|
+        list_of_markets = FarMar::Market.new(market[0], market[1], market[2], market[3], market[4], market[5], market[6])
+        market_array.push(list_of_markets)
+      end
+      return market_array
+    end
+
+    def self.find(id)
+      #returns an instance of Market where the value in the id field of the CSV file matches the passed parameter
+      self.all.find {|i| i.id == id}
+    end
+
+    def vendors
+      #returns a collection of FarMar::Vendor instances that are associated with the market by the market_id field
+      vendor_array = []
+      vendor_list = FarMar::Vendor.all
+      vendor_list.find_all do |i|
+        if i.market_id == id
+          vendor_array.push(i)
+        end
+      end
+      return vendor_array
+    end
+
   end
 end
diff --git a/lib/far_mar/product.rb b/lib/far_mar/product.rb
index 67d6716d..fd49072e 100644
--- a/lib/far_mar/product.rb
+++ b/lib/far_mar/product.rb
@@ -1,4 +1,71 @@
 module FarMar
   class Product
+    attr_accessor :id, :name, :vendor_id
+    def initialize(id, name, vendor_id)
+      @id = id.to_i
+      @name = name
+      @vendor_id = vendor_id.to_i
+    end
+
+    def self.all
+      #returns a collection of product instances, representing all of the products described in the CSV
+      product_array = []
+      product_file = CSV.read("./support/products.csv")
+      product_file.each do |product|
+        list_of_products = FarMar::Product.new(product[0], product[1], product[2])
+        product_array.push(list_of_products)
+      end
+      return product_array
+    end
+
+    def self.find(id)
+      #returns an instance of Product where the value in the id field of the CSV file matches the passed parameter
+      all.find {|i| i.id == id}
+    end
+
+    def vendor
+      # returns the FarMar::Market instance that is associated with this vendor
+      # using the FarMar::Vendor market_id field
+      # vendor_array = []
+      # vendor_list = FarMar::Product.all
+      # vendor_list.find_all do |i|
+      #   if i.id == vendor_id
+      #     vendor_array.push(i)
+      #   end
+      # end
+      # return vendor_array
+
+      vendor_list = FarMar::Vendor.all
+      vendor_list.find do |vendor|
+        vendor.id == vendor_id
+      end
+    end
+
+    def sales
+      #sales - returns a collection
+      #of FarMar::Sale instances that are associated
+      #using the FarMar::Sale product_id field.
+      sales_array = []
+      sales_list = FarMar::Sale.all
+        sales_list.find_all do |i|
+          if i.product_id == id
+            sales_array.push(i)
+          end
+        end
+      return sales_array
+    end
+
+    def self.by_vendor(vendor_id)
+        #returns all of the products with the given vendor_id
+        products_sold_by_a_vendor_array = []
+        product_list = FarMar::Product.all
+        product_list.find_all do |product|
+          if product.vendor_id == vendor_id
+            products_sold_by_a_vendor_array.push(product)
+          end
+        end
+        return products_sold_by_a_vendor_array
+    end
+
   end
 end
diff --git a/lib/far_mar/sale.rb b/lib/far_mar/sale.rb
index 10e3780e..b8bbc666 100644
--- a/lib/far_mar/sale.rb
+++ b/lib/far_mar/sale.rb
@@ -1,4 +1,67 @@
 module FarMar
   class Sale
+    attr_accessor :id, :amount, :purchase_time, :vendor_id, :product_id
+    def initialize(id, amount, purchase_time, vendor_id, product_id)
+      @id = id.to_i
+      @amount = amount.to_i
+      @purchase_time = purchase_time.to_s
+      @vendor_id = vendor_id.to_i
+      @product_id = product_id.to_i
+    end
+
+    def self.all
+      #returns a collection of sale instances, representing all of the sales described in the CSV
+      sale_array = []
+      CSV.read("./support/sales.csv").each do |sale|
+        list_of_sales = Sale.new(sale[0], sale[1], sale[2], sale[3], sale[4])
+        sale_array.push(list_of_sales)
+      end
+      return sale_array
+    end
+
+    def self.find(id)
+      #self.find(id) - returns an instance of Sale where the value of the id field
+      #in the CSV matches the passed parameter.
+      all.find {|i| i.id == id}
+    end
+
+    def vendor
+      # returns the FarMar::Market instance that is associated with this vendor
+      # using the FarMar::Vendor market_id field
+      vendor_list = FarMar::Vendor.all
+      vendor_list.find do |vendor|
+        vendor.id == vendor_id
+      end
+    end
+
+    def product
+      #product - returns the FarMar::Product
+      # instance that is associated with this sale using the FarMar::Sale product_id field
+      product_list = FarMar::Product.all
+      product_list.find do |product|
+        product.id == product_id
+      end
+    end
+
+
+    def self.between(beginning_time, end_time)
+      #returns a collection of FarMar::Sale
+      #objects where the purchase time is between the two times given as arguments
+      sales_between_times_array = []
+      list_of_sales = FarMar::Sale.all
+      list_of_sales.find_all do |sale|
+        if (beginning_time < sale.purchase_time) && (sale.purchase_time < end_time)
+          sales_between_times_array.push(sale)
+        end
+      end
+      return sales_between_times_array
+    end
+#       @begin = DateTime.strptime("2013-11-06 08:35:40 -0800", "%Y-%m-%d %H:%M:%S %z")
+# @end = DateTime.strptime("2013-11-13 08:35:16 -0800", "%Y-%m-%d
+#
+#       list_of_sales.each do |sale_object|
+#         sale_object.purchase_time > beginning_time && sale_object.purchase_time < end_time
+
+
   end
 end
diff --git a/lib/far_mar/vendor.rb b/lib/far_mar/vendor.rb
index 43c213b6..b0934a3c 100644
--- a/lib/far_mar/vendor.rb
+++ b/lib/far_mar/vendor.rb
@@ -1,4 +1,81 @@
 module FarMar
   class Vendor
+    attr_accessor :id, :name, :no_of_employees, :market_id
+      def initialize(id, name, no_of_employees, market_id)
+        @id = id.to_i
+        @name = name
+        @no_of_employees = no_of_employees
+        @market_id = market_id.to_i
+      end
+
+      def self.all
+        #returns a collection of vendor instances, representing all of the vendors described in the CSV
+        vendor_array = []
+        CSV.read("./support/vendors.csv").each do |vendor|
+          list_of_vendors = Vendor.new(vendor[0], vendor[1], vendor[2], vendor[3])
+          vendor_array.push(list_of_vendors)
+        end
+        return vendor_array
+      end
+
+      def self.find(id)
+        self.all.find {|i| i.id == id}
+      end
+
+      def market
+        # returns the FarMar::Market instance that is associated with this vendor
+        # using the FarMar::Vendor market_id field
+        market_array = []
+        market_list = FarMar::Market.all
+        market_list.find_all do |i|
+          if i.id == market_id
+            market_array.push(i)
+          end
+        end
+        return market_array
+      end
+
+      def products
+        product_array = []
+        product_list = FarMar::Product.all
+          product_list.find_all do |i|
+            if i.vendor_id == id
+              product_array.push(i)
+            end
+          end
+        return product_array
+      end
+
+      def sales
+        sales_array = []
+        sales_list = FarMar::Sale.all
+          sales_list.find_all do |i|
+            if i.vendor_id == id
+              sales_array.push(i)
+            end
+          end
+        return sales_array
+      end
+
+      def revenue
+        total_amount = 0
+        sales.each do |sale|
+          total_amount += sale.amount
+        end
+        return total_amount
+      end
+
+      def self.by_market(market_id)
+        #returns all of the vendors with the given market_id
+        vendors_in_a_market_array = []
+        vendor_list = FarMar::Vendor.all
+        vendor_list.find_all do |vendor|
+          if vendor.market_id == market_id
+            vendors_in_a_market_array.push(vendor)
+          end
+        end
+        return vendors_in_a_market_array
+      end
+
   end
 end
diff --git a/spec/far_mar/market_spec.rb b/spec/far_mar/market_spec.rb
index 160df0eb..b8aa4e55 100644
--- a/spec/far_mar/market_spec.rb
+++ b/spec/far_mar/market_spec.rb
@@ -2,7 +2,8 @@
 
 describe FarMar::Market do
   before :each do
-    @market = FarMar::Market.new
+    @market = FarMar::Market.new("14", "Hartford Farmers Market", "1 Block North of Highway 60 on Rural Street","Hartford","Washington", "Wisconsin", "53027")
+    @market_2 = FarMar::Market.new("500", "Montefiore Medical Center Farmers Market_Thursday", "111 E. 210th Street", "Bronx", "Bronx", "New York","10467")
   end
 
   context "initializing" do
@@ -10,4 +11,33 @@
       expect(@market).to be_an_instance_of FarMar::Market
     end
   end
+
+  context ".self.all" do
+    it "returns an array" do
+      expect(FarMar::Market.all().class).to be Array
+    end
+    it "returns instances of all lines in the csv" do
+      expect(FarMar::Market.all().length).to eq 500
+    end
+  end
+
+  context ".self.find(id)" do
+    it "returns the right instance" do
+      expect(FarMar::Market.find(14).name).to eq "Hartford Farmers Market"
+    end
+
+    it "returns an instance with the same id as the value in the CSV file" do
+      expect(@market.id).to eq 14
+      expect(@market_2.id).to eq 500
+    end
+  end
+
+  context "#vendors" do
+    it "returns a collection" do
+      expect(@market.vendors.class).to eq Array
+    end
+    it "is a collection of Vendor instances in Far::Mar" do
+      expect(@market.vendors.length).to eq 8
+    end
+  end
 end
diff --git a/spec/far_mar/product_spec.rb b/spec/far_mar/product_spec.rb
index 4e20d380..03963e8f 100644
--- a/spec/far_mar/product_spec.rb
+++ b/spec/far_mar/product_spec.rb
@@ -2,7 +2,8 @@
 
 describe FarMar::Product do
   before :each do
-    @product = FarMar::Product.new
+    @product = FarMar::Product.new(12, "Gorgeous Fish", 6)
+    @product_2 = FarMar::Product.new(8193, "Cruel Beef", 2690)
   end
 
   context "initializing" do
@@ -10,4 +11,46 @@
       expect(@product).to be_an_instance_of FarMar::Product
     end
   end
+
+  context ".self.all" do
+    it "returns an array" do
+      expect(FarMar::Product.all().class).to be Array
+    end
+    it "returns instances of all lines in the csv" do
+      expect(FarMar::Product.all().length).to eq 8193
+    end
+  end
+
+  context ".self.find(id)" do
+    it "returns an instance of Product" do
+      expect(FarMar::Product.find(12)).to be_an_instance_of FarMar::Product
+    end
+
+    it "returns the right instance" do
+      expect(FarMar::Product.find(12).name).to eq "Gorgeous Fish"
+    end
+    it "returns an instance with the same id as the value in the CSV file" do
+      expect(@product.id).to eq 12
+      expect(@product_2.id).to eq 8193
+    end
+  end
+
+  context "#vendor" do
+    it "returns an instance of Vendor" do
+      expect(@product.vendor).to be_an_instance_of FarMar::Vendor
+    end
+  end
+
+  context "#sales" do
+    it "returns a collection of FarMar::Sale instances" do
+      expect(@product_2.sales.length).to eq 2
+    end
+  end
+
+  context ".self.by_vendor(vendor_id)" do
+    it "returns all of the products with a given vendor id" do
+        expect(FarMar::Product.by_vendor(6).length).to eq 3
+    end
+  end
+
 end
diff --git a/spec/far_mar/sale_spec.rb b/spec/far_mar/sale_spec.rb
index 90c45a92..32d97d24 100644
--- a/spec/far_mar/sale_spec.rb
+++ b/spec/far_mar/sale_spec.rb
@@ -2,7 +2,8 @@
 
 describe FarMar::Sale do
   before :each do
-    @sale = FarMar::Sale.new
+    @sale = FarMar::Sale.new(14, 4978, "2013-11-10 01:51:24 -0800", 3, 4)
+    @sale_2 = FarMar::Sale.new(12001, 8923.0, "2013-11-12 02:03:31 -0800", 2690, 8192)
   end
 
   context "initializing" do
@@ -10,4 +11,52 @@
       expect(@sale).to be_an_instance_of FarMar::Sale
     end
   end
+
+  context ".self.all" do
+    it "returns an array" do
+      expect(FarMar::Sale.all().class).to be Array
+    end
+    it "returns instances of all lines in the csv" do
+      expect(FarMar::Sale.all().length).to eq 12798
+    end
+  end
+
+  context ".self.find(id)" do
+    it "returns the right instance" do
+      expect(FarMar::Sale.find(14).amount).to eq 4978
+    end
+
+    it "returns an instance with the same id as the value in the CSV file" do
+      expect(@sale.id).to eq 14
+      expect(@sale_2.id).to eq 12001
+    end
+  end
+
+  context "#product" do
+    it "returns an instance of product" do
+      expect(@sale.product).to be_an_instance_of FarMar::Product
+    end
+
+    it "returns the right product" do
+      expect(@sale.product.id).to eq 4
+      expect(@sale_2.product.id).to eq 8192
+    end
+  end
+
+  context "#vendor" do
+    it "returns an instance of a vendor" do
+      expect(@sale.vendor).to be_an_instance_of FarMar::Vendor
+    end
+  end
+
+  context ".self.between(beginning_time, end_time)" do
+    it "returns an array of sales" do
+      expect(FarMar::Sale.between("2013-11-07 20:25:38 -0800", "2013-11-08 10:38:56 -0800").class).to eq Array
+    end
+
+    it "returns the expected number of sales" do
+      expect(FarMar::Sale.between("2013-11-07 20:25:38 -0800", "2013-11-08 10:38:56 -0800").length).to eq 1090
+    end
+  end
+
 end
diff --git a/spec/far_mar/vendor_spec.rb b/spec/far_mar/vendor_spec.rb
index 804d90ab..a6c85910 100644
--- a/spec/far_mar/vendor_spec.rb
+++ b/spec/far_mar/vendor_spec.rb
@@ -2,12 +2,66 @@
 
 describe FarMar::Vendor do
   before :each do
-    @vendor = FarMar::Vendor.new
+    @vendor = FarMar::Vendor.new(45, "Hyatt, Conroy and Ortiz", 5, 10)
+    @vendor_2 = FarMar::Vendor.new(2690, "Mann-Lueilwitz", 4, 500)
   end
 
-  context "initializing" do
-    it "returns a vendor object" do
+  context "#initializing" do
+    it "creates an instance of @vendor" do
       expect(@vendor).to be_an_instance_of FarMar::Vendor
+      expect(@vendor_2).to be_an_instance_of FarMar::Vendor
     end
   end
+
+  context ".self.all" do
+    it "returns an array" do
+      expect(FarMar::Vendor.all().class).to be Array
+    end
+    it "returns instances of all lines in the csv" do
+      expect(FarMar::Vendor.all().length).to eq 2690
+    end
+  end
+
+  context ".self.find(id)" do
+    it "returns the right instance" do
+      expect(FarMar::Vendor.find(45).name).to eq "Hyatt, Conroy and Ortiz"
+    end
+
+    it "returns an instance with the same id as the value in the CSV file" do
+      expect(@vendor.id).to eq 45
+      expect(@vendor_2.id).to eq 2690
+    end
+  end
+
+  context "#market" do
+    it "returns an instance of FarMar::Market associated with the vendor" do
+      expect(@vendor.market.length).to eq 1
+      expect(@vendor_2.market.length).to eq 1
+    end
+  end
+
+  context "#products" do
+    it "returns a collection of FarMar::Product product instances" do
+      expect(@vendor.products.class).to be Array
+    end
+  end
+
+  context "#sales" do
+    it "returns a collection of FarMar::Sale sale instances" do
+      expect(@vendor.sales.class).to be Array
+    end
+  end
+
+  context "#revenue" do
+    it "returns a sum of all the vendors sales" do
+      expect(@vendor.revenue).to eq 10150
+    end
+  end
+
+  context ".self.by_market(market_id)" do
+    it "returns all the vendors with the given market_id" do
+      expect(FarMar::Vendor.by_market(10).length).to eq 9
+    end
+  end
+
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index f7dc6dfb..14061ed2 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -2,3 +2,19 @@
 SimpleCov.start
 
 require './lib/far_mar'
+
+# RSpec.configure do |config|
+#   config.after(:suite) do
+#     num_failed = RSpec.world
+#                       .filtered_examples
+#                       .values
+#                       .flatten
+#                       .count(&:exception)
+# ​
+#     if num_failed == 0
+#       `say "You did it Amy! You're amazing!"`
+#     else
+#       `say "Keep going! Only #{num_failed} #{num_failed > 1 ? "tests" : "test"} to go!"`
+#     end
+#   end
+# end