diff --git a/lib/mutant.rb b/lib/mutant.rb
index 38876986..1247bf3a 100644
--- a/lib/mutant.rb
+++ b/lib/mutant.rb
@@ -3,6 +3,7 @@ require 'abstract'
 require 'securerandom'
 require 'to_source'
 require 'ice_nine'
+require 'backports'
 
 # Library namespace
 module Mutant
@@ -35,8 +36,6 @@ module Mutant
 end
 
 require 'mutant/random'
-require 'mutant/killer'
-require 'mutant/killer/rspec'
 require 'mutant/mutator'
 require 'mutant/mutator/registry'
 require 'mutant/mutator/literal'
@@ -66,3 +65,7 @@ require 'mutant/matcher/method'
 require 'mutant/matcher/method/singleton'
 require 'mutant/matcher/method/instance'
 require 'mutant/matcher/method/classifier'
+
+require 'mutant/killer'
+require 'mutant/killer/rspec'
+require 'mutant/runner'
diff --git a/lib/mutant/killer.rb b/lib/mutant/killer.rb
index 66bb34a9..6762579e 100644
--- a/lib/mutant/killer.rb
+++ b/lib/mutant/killer.rb
@@ -39,8 +39,8 @@ module Mutant
     #
     # @api private
     #
-    def killed?
-      @killed
+    def fail?
+      !@killed
     end
 
   private
diff --git a/lib/mutant/matcher/method.rb b/lib/mutant/matcher/method.rb
index d1d38d5f..60052218 100644
--- a/lib/mutant/matcher/method.rb
+++ b/lib/mutant/matcher/method.rb
@@ -46,6 +46,20 @@ module Mutant
         Context::Constant.build(source_path, constant)
       end
 
+      # Initialize method filter
+      #
+      # @param [Class|Module] constant
+      # @param [Symbol] method_name
+      #
+      # @return [undefined]
+      #
+      # @api private
+      #
+      def initialize(constant, method_name)
+        raise if constant.kind_of?(String)
+        @constant, @method_name = constant, method_name.to_sym
+      end
+
     private
 
       # Return method name
@@ -57,27 +71,23 @@ module Mutant
       attr_reader :method_name
       private :method_name
 
+      # Return constant
+      #
+      # @return [Class|Module]
+      #
+      # @api private
+      #
+      attr_reader :constant
+      private :constant
+
       # Return constant name
       #
       # @return [String]
       #
       # @api private
       #
-      attr_reader :constant_name
-      private :constant_name
-
-
-      # Initialize method filter
-      #
-      # @param [String] constant_name
-      # @param [Symbol] method_name
-      #
-      # @return [undefined]
-      #
-      # @api private
-      #
-      def initialize(constant_name, method_name)
-        @constant_name, @method_name = constant_name, method_name
+      def constant_name
+        @constant.name
       end
 
       # Return method
@@ -94,7 +104,9 @@ module Mutant
       #
       # @api private
       #
-      abstract_method :node_class
+      def node_class
+        self.class::NODE_CLASS
+      end
 
       # Check if node is matched
       #
@@ -109,7 +121,7 @@ module Mutant
       # @api private
       #
       def match?(node)
-        node.line  == source_file_line &&
+        node.line  == source_line &&
         node.class == node_class &&
         node.name  == method_name
       end
@@ -121,9 +133,6 @@ module Mutant
       # @api private
       #
       def ast
-        if source_path == '(mutant)'
-          raise 'Trying to mutate mutated method!'
-        end
         File.read(source_path).to_ast
       end
 
@@ -143,7 +152,7 @@ module Mutant
       #
       # @api private
       #
-      def source_file_line
+      def source_line
         source_location.last
       end
 
@@ -181,19 +190,6 @@ module Mutant
           Subject.new(context, node)
         end
       end
-
-      # Return constant
-      #
-      # @return [Class|Module]
-      #
-      # @api private
-      #
-      def constant
-        constant_name.split('::').inject(::Object) do |parent, name|
-          parent.const_get(name)
-        end
-      end
-
       memoize :subject
     end
   end
diff --git a/lib/mutant/matcher/method/classifier.rb b/lib/mutant/matcher/method/classifier.rb
index 9e0e27ac..9d081114 100644
--- a/lib/mutant/matcher/method/classifier.rb
+++ b/lib/mutant/matcher/method/classifier.rb
@@ -3,7 +3,7 @@ module Mutant
     class Method < self
       # A classifier for input strings
       class Classifier
-        extend Immutable
+        include Immutable
 
         TABLE = {
           '.' => Matcher::Method::Singleton,
@@ -34,8 +34,6 @@ module Mutant
           new(match).matcher
         end
 
-      public
-
         # Return method matcher
         #
         # @return [Matcher::Method]
@@ -43,7 +41,7 @@ module Mutant
         # @api private
         #
         def matcher
-          matcher_class.new(constant_name, method_name)
+          matcher_class.new(constant, method_name)
         end
 
       private
@@ -58,6 +56,18 @@ module Mutant
           @match = match
         end
 
+        # Return constant 
+        #
+        # @return [Class|Module]
+        #
+        # @api private
+        #
+        def constant
+          constant_name.split('::').inject(::Object) do |parent, name|
+            parent.const_get(name)
+          end
+        end
+
         # Return constant name
         #
         # @return [String]
@@ -90,7 +100,7 @@ module Mutant
 
         # Return matcher class
         #
-        # @return [Class<Matcher>]
+        # @return [Class:Mutant::Matcher]
         #
         # @api private
         #
diff --git a/lib/mutant/matcher/method/instance.rb b/lib/mutant/matcher/method/instance.rb
index 260f1399..2703e441 100644
--- a/lib/mutant/matcher/method/instance.rb
+++ b/lib/mutant/matcher/method/instance.rb
@@ -4,6 +4,14 @@ module Mutant
       # Matcher for instance methods
       class Instance < self
 
+        NODE_CLASS = Rubinius::AST::Define
+
+        def self.extract(constant)
+          constant.public_instance_methods(false).map do |name|
+            new(constant, name)
+          end
+        end
+
       private
 
         # Return method instance
@@ -16,16 +24,6 @@ module Mutant
           constant.instance_method(method_name)
         end
 
-        # Return matched node class
-        #
-        # @return [Rubinius::AST::Define]
-        #
-        # @api private
-        #
-        def node_class
-          Rubinius::AST::Define
-        end
-
         # Return matched node
         #
         # @return [Rubinus::AST::Define]
diff --git a/lib/mutant/matcher/method/singleton.rb b/lib/mutant/matcher/method/singleton.rb
index d6ea2049..f09a26b8 100644
--- a/lib/mutant/matcher/method/singleton.rb
+++ b/lib/mutant/matcher/method/singleton.rb
@@ -4,6 +4,17 @@ module Mutant
       # Matcher for singleton methods
       class Singleton < self
 
+        NODE_CLASS = Rubinius::AST::DefineSingletonScope
+
+        def self.extract(constant)
+          return [] 
+          constant.singleton_class.public_instance_methods(false).reject do |method|
+            method.to_sym == :__class_init__
+          end.map do |name|
+            new(constant, name)
+          end
+        end
+
       private
 
         # Return method instance
@@ -16,16 +27,6 @@ module Mutant
           constant.method(method_name)
         end
 
-        # Return matched node class
-        #
-        # @return [Rubinius::AST::DefineSingletonScope]
-        #
-        # @api private
-        #
-        def node_class
-          Rubinius::AST::DefineSingletonScope
-        end
-
         # Check for stopping AST walk on branch
         #
         # This method exist to protect against the
diff --git a/lib/mutant/random.rb b/lib/mutant/random.rb
index e4b1d887..8798579b 100644
--- a/lib/mutant/random.rb
+++ b/lib/mutant/random.rb
@@ -18,7 +18,7 @@ module Mutant
     # @api private
     #
     def self.fixnum
-      Random.rand(1000)
+      ::Random.rand(1000)
     end
 
     # Return random float
@@ -28,7 +28,7 @@ module Mutant
     # @api private
     #
     def self.float
-      Random.rand
+      ::Random.rand
     end
   end
 end
diff --git a/lib/mutant/runner.rb b/lib/mutant/runner.rb
new file mode 100644
index 00000000..cb9d45da
--- /dev/null
+++ b/lib/mutant/runner.rb
@@ -0,0 +1,128 @@
+module Mutant
+  class Runner
+    class Reporter
+      def self.run(*args)
+        new(*args)
+      end
+
+    private
+
+      def initialize(output, runner)
+        @output, @runner = output, runner
+        run
+      end
+
+      def run
+        @runner.errors.each do |error|
+          print_error(error)
+        end
+      end
+
+      def print_error(error)
+        Kill.run(output, error)
+      end
+    end
+
+    class Reporter
+      class Kill
+        def self.run(*args)
+          new(*args)
+        end
+
+      private 
+
+        def initialize(output, error)
+          @output, @error = output, error
+          run
+        end
+
+        def mutant
+          @error.mutant
+        end
+
+        def root_ast
+        end
+      end
+    end
+  end
+end
+
+module Mutant
+  class Runner
+    include Immutable
+
+    def self.run(options)
+      killer = options.fetch(:killer) do
+        raise ArgumentError, 'Missing :killer in options'
+      end
+
+      pattern = options.fetch(:pattern) do
+        raise ArgumentError, 'Missing :pattern in options'
+      end
+
+      new(killer, pattern)
+    end
+
+    attr_reader :errors
+
+    def errors?
+      errors.empty?
+    end
+
+
+  private
+
+    def initialize(killer, pattern)
+      @killer, @pattern, @errors = killer, pattern, []
+      run
+    end
+
+    def matcher_classes
+      [Matcher::Method::Singleton, Matcher::Method::Instance]
+    end
+
+    def constants
+      ObjectSpace.each_object(Module).select do |constant|
+        @pattern =~ constant.name
+      end
+    end
+
+    def matchers
+      matcher_classes.each_with_object([]) do |klass, matchers|
+        matchers.concat(matches_for(klass))
+      end
+    end
+
+    def matches_for(klass)
+      constants.each_with_object([]) do |constant, matches|
+        matches.concat(klass.extract(constant))
+      end
+    end
+
+    def subjects
+      matchers.each_with_object([]) do |matcher, subjects|
+        subjects.concat(matcher.each.to_a)
+      end
+    end
+
+    def killers
+      subjects.each_with_object([]) do |subject, killers|
+        killers.concat(killers_for(subject))
+      end
+    end
+
+    def killers_for(subject)
+      subject.map do |mutation|
+        @killer.run(subject, mutation)
+      end
+    end
+
+    def run
+      killers.select do |killer|
+        killer.fail?
+      end.each do |killer|
+        errors << killer
+      end
+    end
+  end
+end
diff --git a/lib/mutant/subject.rb b/lib/mutant/subject.rb
index dc606697..235d6458 100644
--- a/lib/mutant/subject.rb
+++ b/lib/mutant/subject.rb
@@ -68,11 +68,23 @@ module Mutant
     # @api private
     #
     def insert(node)
-      Loader.load(context.root(node))
+      Loader.load(root(node))
 
       self
     end
 
+    # Return root AST for node
+    #
+    # @param [Rubinius::AST::Node] node
+    #
+    # @return [Rubinius::AST::Node]
+    #
+    # @api private
+    #
+    def root(node)
+      context.root(node)
+    end
+
   private
 
     # Initialize subject
diff --git a/spec/integration/mutant/rspec_killer_spec.rb b/spec/integration/mutant/rspec_killer_spec.rb
index ba7ddcf7..b625ed1e 100644
--- a/spec/integration/mutant/rspec_killer_spec.rb
+++ b/spec/integration/mutant/rspec_killer_spec.rb
@@ -13,7 +13,7 @@ describe Mutant,'rspec integration' do
       subject.each do |mutation|
         Mutant::Killer::Rspec.nest do 
           runner =  Mutant::Killer::Rspec.run(subject,mutation)
-          runner.killed?.should be(true)
+          runner.fail?.should be(false)
         end
       end
     end
@@ -22,7 +22,7 @@ describe Mutant,'rspec integration' do
       subject.each do |mutation|
         Mutant::Killer::Rspec.nest do 
           runner =  Mutant::Killer::Rspec.run(subject,mutation)
-          runner.killed?.should be(false)
+          runner.fail?.should be(true)
         end
       end
     end
diff --git a/spec/integration/mutant/runner_spec.rb b/spec/integration/mutant/runner_spec.rb
new file mode 100644
index 00000000..aaf82695
--- /dev/null
+++ b/spec/integration/mutant/runner_spec.rb
@@ -0,0 +1,19 @@
+require 'spec_helper'
+
+describe Mutant, 'runner' do
+  around do |example|
+    Dir.chdir(TestApp.root) do
+      example.run
+    end
+  end
+
+  it 'allows to run mutant over a project' do
+    Mutant::Killer::Rspec.nest do
+      report = Mutant::Runner.run(
+        :pattern => /\ATestApp::/,
+        :killer => Mutant::Killer::Rspec
+      )
+      report.errors.size.should be(18)
+    end
+  end
+end
diff --git a/spec/shared/method_filter_parse_behavior.rb b/spec/shared/method_filter_parse_behavior.rb
index f88a8848..7a80294e 100644
--- a/spec/shared/method_filter_parse_behavior.rb
+++ b/spec/shared/method_filter_parse_behavior.rb
@@ -8,7 +8,7 @@ shared_examples_for 'a method filter parse result' do
   it { should be(response) }
 
   it 'should initialize method filter with correct arguments' do
-    expected_class.should_receive(:new).with('Foo', :bar).and_return(response)
+    expected_class.should_receive(:new).with(TestApp::Literal, :string).and_return(response)
     subject
   end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 0d387406..08986893 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -6,8 +6,8 @@ require 'rspec'
 Dir[File.expand_path('../{support,shared}/**/*.rb', __FILE__)].each { |f| require f }
 
 $: << File.join(TestApp.root,'lib')
-require 'test_app'
 
+require 'test_app'
 require 'mutant'
 
 RSpec.configure do |config|
diff --git a/spec/unit/mutant/killer/killed_ques_spec.rb b/spec/unit/mutant/killer/fail_ques_spec.rb
similarity index 91%
rename from spec/unit/mutant/killer/killed_ques_spec.rb
rename to spec/unit/mutant/killer/fail_ques_spec.rb
index dc7bc95f..33645063 100644
--- a/spec/unit/mutant/killer/killed_ques_spec.rb
+++ b/spec/unit/mutant/killer/fail_ques_spec.rb
@@ -1,7 +1,7 @@
 require 'spec_helper'
 
-describe Mutant::Killer,'#killed?' do
-  subject { object.killed? }
+describe Mutant::Killer,'#fail?' do
+  subject { object.fail? }
 
   let(:object)           { class_under_test.run(mutation_subject,mutant)  }
   let(:mutation_subject) { mock('Subject', :insert => nil, :reset => nil) }
@@ -21,7 +21,7 @@ describe Mutant::Killer,'#killed?' do
     
     it_should_behave_like 'an idempotent method'
 
-    it { should be(true) }
+    it { should be(false) }
   end
 
   context 'when mutant was NOT killed' do
@@ -29,6 +29,6 @@ describe Mutant::Killer,'#killed?' do
     
     it_should_behave_like 'an idempotent method'
 
-    it { should be(false) }
+    it { should be(true) }
   end
 end
diff --git a/spec/unit/mutant/killer/rspec/class_methods/run_spec.rb b/spec/unit/mutant/killer/rspec/class_methods/run_spec.rb
index 37f999b7..15e7a4dc 100644
--- a/spec/unit/mutant/killer/rspec/class_methods/run_spec.rb
+++ b/spec/unit/mutant/killer/rspec/class_methods/run_spec.rb
@@ -17,14 +17,14 @@ describe Mutant::Killer::Rspec, '.run' do
   context 'when run exits zero' do
     let(:exit_status) { 0 }
 
-    its(:killed?) { should be(false)  }
+    its(:fail?) { should be(true)  }
     it { should be_a(described_class) }
   end
 
   context 'when run exits nonzero' do
     let(:exit_status) { 1 }
 
-    its(:killed?) { should be(true)   }
+    its(:fail?) { should be(false)   }
     it { should be_a(described_class) }
   end
 end
diff --git a/spec/unit/mutant/matcher/method/classifier/class_methods/run_spec.rb b/spec/unit/mutant/matcher/method/classifier/class_methods/run_spec.rb
index 9eccdbd1..4d156588 100644
--- a/spec/unit/mutant/matcher/method/classifier/class_methods/run_spec.rb
+++ b/spec/unit/mutant/matcher/method/classifier/class_methods/run_spec.rb
@@ -5,14 +5,14 @@ describe Mutant::Matcher::Method::Classifier, '.run' do
 
 
   context 'with instance method notation' do
-    let(:input)          { 'Foo#bar' }
+    let(:input)          { 'TestApp::Literal#string' }
     let(:expected_class) { Mutant::Matcher::Method::Instance }
 
     it_should_behave_like 'a method filter parse result'
   end
 
   context 'with singleton method notation' do
-    let(:input)          { 'Foo.bar' }
+    let(:input)          { 'TestApp::Literal.string' }
     let(:expected_class) { Mutant::Matcher::Method::Singleton }
 
     it_should_behave_like 'a method filter parse result'
diff --git a/spec/unit/mutant/matcher/method/classifier/matcher_spec.rb b/spec/unit/mutant/matcher/method/classifier/matcher_spec.rb
deleted file mode 100644
index ed0b0990..00000000
--- a/spec/unit/mutant/matcher/method/classifier/matcher_spec.rb
+++ /dev/null
@@ -1,29 +0,0 @@
-require 'spec_helper'
-
-# This method cannot be called directly, spec only exists for heckle demands
-describe Mutant::Matcher::Method::Classifier, '#matcher' do
-  subject { object.matcher }
-
-  let(:object) { described_class.send(:new, match) }
-
-  let(:match) { [mock, constant_name, scope_symbol, method_name] }
-
-  let(:constant_name) { mock('Constant Name') }
-  let(:method_name)   { 'foo'                  }
-
-  context 'with "#" as scope symbol' do
-    let(:scope_symbol) { '#' }
-
-    it { should be_a(Mutant::Matcher::Method::Instance) }
-    its(:method_name)   { should be(method_name.to_sym) }
-    its(:constant_name) { should be(constant_name)      }
-  end
-
-  context 'with "." as scope symbol' do
-    let(:scope_symbol) { '.' }
-
-    it { should be_a(Mutant::Matcher::Method::Singleton) }
-    its(:method_name)   { should be(method_name.to_sym)  }
-    its(:constant_name) { should be(constant_name)       }
-  end
-end
diff --git a/spec/unit/mutant/matcher/method/context_spec.rb b/spec/unit/mutant/matcher/method/context_spec.rb
index ca46ea82..8c7a3bb4 100644
--- a/spec/unit/mutant/matcher/method/context_spec.rb
+++ b/spec/unit/mutant/matcher/method/context_spec.rb
@@ -3,7 +3,7 @@ require 'spec_helper'
 describe Mutant::Matcher::Method, '#context' do
   subject { object.context }
 
-  let(:object)  { described_class::Singleton.new('TestApp::Literal', 'string') }
+  let(:object)  { described_class::Singleton.new(TestApp::Literal, 'string') }
   let(:context) { mock('Context')                                                       }
 
   before do
diff --git a/spec/unit/mutant/matcher/method/node_class_spec.rb b/spec/unit/mutant/matcher/method/node_class_spec.rb
deleted file mode 100644
index 4ab947fd..00000000
--- a/spec/unit/mutant/matcher/method/node_class_spec.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-require 'spec_helper'
-
-describe Mutant::Matcher::Method, '#node_class' do
-  subject { object.send(:node_class) }
-
-  let(:object) { described_class.allocate }
-
-  it 'should raise error' do
-    expect { subject }.to raise_error(NotImplementedError, 'Mutant::Matcher::Method#node_class is not implemented')
-  end
-end
-