diff --git a/lib/crono.rb b/lib/crono.rb
index 6744e57..ccf9ced 100644
--- a/lib/crono.rb
+++ b/lib/crono.rb
@@ -4,5 +4,6 @@ end
 require "active_support/all"
 require "crono/version.rb"
 require "crono/period.rb"
+require "crono/schedule.rb"
 require "crono/config.rb"
 require "crono/performer_proxy.rb"
diff --git a/lib/crono/cli.rb b/lib/crono/cli.rb
index 747e2e2..332ff20 100644
--- a/lib/crono/cli.rb
+++ b/lib/crono/cli.rb
@@ -7,7 +7,7 @@ module Crono
     def run
       load_rails
       print_banner
-      # start_working_loop
+      start_working_loop
     end
 
   private
diff --git a/lib/crono/config.rb b/lib/crono/config.rb
index 55cbbfc..809965e 100644
--- a/lib/crono/config.rb
+++ b/lib/crono/config.rb
@@ -5,7 +5,7 @@ module Crono
     attr_accessor :schedule
 
     def initialize
-      self.schedule = []
+      self.schedule = Schedule.new
     end
   end
 end
diff --git a/lib/crono/performer_proxy.rb b/lib/crono/performer_proxy.rb
index 30fca3d..bd95a38 100644
--- a/lib/crono/performer_proxy.rb
+++ b/lib/crono/performer_proxy.rb
@@ -5,7 +5,7 @@ module Crono
     end
 
     def every(period, *args)
-      Config.instance.schedule += [@performer, Period.new(period, *args)]
+      Config.instance.schedule.add(@performer, Period.new(period, *args))
     end
   end
 
diff --git a/lib/crono/schedule.rb b/lib/crono/schedule.rb
new file mode 100644
index 0000000..79e841b
--- /dev/null
+++ b/lib/crono/schedule.rb
@@ -0,0 +1,10 @@
+module Crono
+  class Schedule
+    def initialize
+      @schedule = []
+    end
+
+    def add(peformer, period)
+    end
+  end
+end
diff --git a/spec/cli_spec.rb b/spec/cli_spec.rb
index 7d4197d..113928f 100644
--- a/spec/cli_spec.rb
+++ b/spec/cli_spec.rb
@@ -9,8 +9,9 @@ describe Crono::CLI do
   let(:cli) { Crono::CLI.instance }
 
   describe "#run" do
-    it "should try to initialize rails with #load_rails" do
+    it "should try to initialize rails with #load_rails and start working loop" do
       expect(cli).to receive(:load_rails)
+      expect(cli).to receive(:start_working_loop)
       cli.run
     end
   end
@@ -21,4 +22,8 @@ describe Crono::CLI do
       expect(thread).to be_stop
     end
   end
+
+  describe "#start_working_loop" do
+    it "should start working loop"
+  end
 end
diff --git a/spec/config_spec.rb b/spec/config_spec.rb
index bb25b4f..32e7c1f 100644
--- a/spec/config_spec.rb
+++ b/spec/config_spec.rb
@@ -2,9 +2,9 @@ require "spec_helper"
 
 describe Crono::Config do
   describe "#initialize" do
-    it "should initialize schedule with an empty array" do
+    it "should initialize schedule" do
       @config = Crono::Config.instance
-      expect(@config.schedule).to eql([])
+      expect(@config.schedule).to be_a(Crono::Schedule)
     end
   end
 end
diff --git a/spec/performer_proxy_spec.rb b/spec/performer_proxy_spec.rb
index c38534c..920cefe 100644
--- a/spec/performer_proxy_spec.rb
+++ b/spec/performer_proxy_spec.rb
@@ -6,7 +6,7 @@ end
 
 describe Crono::PerformerProxy do
   it "should add job and period to schedule" do
+    expect(Crono::Config.instance.schedule).to receive(:add).with(TestJob, kind_of(Crono::Period))
     Crono.perform(TestJob).every(2.days, at: "15:30")
-    expect(Crono::Config.instance.schedule).to_not be_empty
   end
 end
diff --git a/spec/schedule_spec.rb b/spec/schedule_spec.rb
new file mode 100644
index 0000000..6e6bee7
--- /dev/null
+++ b/spec/schedule_spec.rb
@@ -0,0 +1,15 @@
+require "spec_helper"
+
+class TestJob
+  def perform;end
+end
+
+describe Crono::Schedule do
+  describe "#add" do
+    it "should add an entry to schedule" do
+      @schedule = Crono::Schedule.new
+      @period = Crono::Period.new(1.day)
+      @schedule.add(TestJob, @period)
+    end
+  end
+end