diff --git a/Queue.rb b/Queue.rb
index 57ef609b..58d27dd8 100644
--- a/Queue.rb
+++ b/Queue.rb
@@ -1,19 +1,33 @@
 class Queue
   def initialize
+    @store = Array.new
   end
-  
+
   def enqueue(element)
+    @store.push(element)
+    # option 2: @store.unshift(element) push from the first, not the last
   end
- 
+
   def dequeue
+    @store.shift # remove and return the first item in the array
+    # option2: return @store.drop # remove the first item in the array and return the rest
+    # return @store.delete_at(0)
   end
 
   def front
+    return @store.first
   end
- 
+
   def size
+    return @store.length
   end
 
   def empty?
+    return size == 0
   end
+
+  def to_s
+    return @store.join(", ")
+  end
+
 end
diff --git a/Stack.rb b/Stack.rb
index 25da8b60..319e5e62 100644
--- a/Stack.rb
+++ b/Stack.rb
@@ -2,19 +2,31 @@ class Stack
   def initialize
     @store = Array.new
   end
-  
+
   def push(element)
+    @store.push(element) # @store << element, element goes to the end of array.
   end
- 
-  def pop
+
+  def pop # take out and return the last element of the array
+    return @store.pop # @store.delete_at(-1)
   end
 
-  def top
+  def top # return the last element of the array
+    return @store.last
   end
- 
+
   def size
+    return @store.length
   end
 
   def empty?
+    return size == 0 # call size method
+    # store.empty?
+    # @store.length == 0
   end
+
+  def to_s
+    return @store.join(", ")
+  end
+
 end
diff --git a/job-simulation.rb b/job-simulation.rb
index 2c9c46d5..118e7eef 100644
--- a/job-simulation.rb
+++ b/job-simulation.rb
@@ -1,15 +1,80 @@
 # A company has six hiring positions with more people wanting jobs than the
 # number of available positions.  The company managers decide in order to give
 # more people an opportunity to make money; they will allow people to work in
-# three-month intervals. The first five people on the waiting list will be hired
-# in the order that they are on the waiting list.  The first six people will
-# keep these positions for three months.  At the end of three months, the
-# manager will roll a dice to determine the number of people who will lose their
-# jobs. The company will use the policy of last-hired-first-fired.  For example,
-# if the dice roll is 3, the last 3 people hired will lose their jobs to the
-# first 3 people on the waiting list. People losing their jobs will be placed on
-# the back of the waiting list in the order that they are fired. This process
-# will continue for every three-month interval.
+# three-month intervals.
+
+# The first six people on the waiting list will be hired in the order that they are on the waiting list.
+# The first six people will keep these positions for three months.
+# At the end of three months, the manager will roll a dice to determine the number of people who will lose their jobs.
+# The company will use the policy of last-hired-first-fired.
+# if the dice roll is 3, the last 3 people hired will lose their jobs to the first 3 people on the waiting list.
+# People losing their jobs will be placed on the back of the waiting list in the order that they are fired.
+# This process will continue for every three-month interval.
+# due Sunday evening/Tuesday morning
 
 require './Stack.rb'
 require './Queue.rb'
+
+class CrazyCompany
+  def initialize
+    @wait_list = Queue.new #FIFO/Quene
+    @employees = Stack.new #LIFO/stack
+    initial_employees = ["A", "B", "C", "D", "E", "F", "G", "H", "J"]
+    initial_employees.each do |initial_employee|
+      @wait_list.enqueue(initial_employee)
+    end
+  end
+
+  def hire(number_to_hire) #from wait_list
+    candidates_to_hire = []
+    if @wait_list.size >= number_to_hire
+      number_to_hire.times do |i|
+        candidate_to_hire = @wait_list.dequeue
+        @employees.push(candidate_to_hire)
+        candidates_to_hire << candidate_to_hire
+      end
+    else
+      puts "Sorry, there are not enough candidates on the waiting list."
+    end
+    puts "Hired: #{candidates_to_hire.join(", ")}"
+  end
+
+  def fire(number_to_fire) #from employees
+    employees_to_fire = []
+    number_to_fire.times do |i|
+      employee_to_fire = @employees.pop
+      @wait_list.enqueue(employee_to_fire)
+      employees_to_fire << employee_to_fire
+    end
+      puts "Fired: #{employees_to_fire.join(", ")}"
+  end
+
+  def three_month_interval
+    #assume use a six sides die
+    number_to_fire = rand(1..6)
+    number_to_hire = number_to_fire
+    fire(number_to_fire)
+    hire(number_to_hire)
+  end
+
+  def status
+    puts "current employees: #{@employees.to_s}"
+    puts "current wait list: #{@wait_list.to_s}"
+    puts "============================="
+  end
+
+  def call_interval(number_of_times)
+    number_of_times.times do |i|
+      puts "====interval:#{i + 1}======="
+      three_month_interval
+      status
+    end
+  end
+
+end
+#============TEST================
+new_company = CrazyCompany.new
+new_company.status
+new_company.hire(6)
+new_company.status
+new_company.call_interval(2)