diff --git a/lib/exstreme/gnode/behaviour.ex b/lib/exstreme/gnode/behaviour.ex
index a23d006..8f974af 100644
--- a/lib/exstreme/gnode/behaviour.ex
+++ b/lib/exstreme/gnode/behaviour.ex
@@ -5,43 +5,44 @@ defmodule Exstreme.GNode.Behaviour do
   defmacro __using__(_) do
     quote do
       use GenServer
-      import Exstreme.GNode.Behaviour
-    end
-  end
 
-  defmodule Data do
-    @moduledoc """
-    """
-    alias __MODULE__
+      defmodule Data do
+        @moduledoc """
+        """
+        alias __MODULE__
 
-    @type graph_func :: ((term, Data.t) -> {:ok, term} | :error)
+        @type graph_func :: ((term, Data.t) -> {:ok, term} | :error)
 
-    @type t :: %Data{next: [pid], pid: pid, nid: atom, func: graph_func, funnel_queue: [term], received_counter: non_neg_integer, sent_counter: non_neg_integer, opts: [key: term]}
-    defstruct [next: [], pid: nil, nid: nil, func: nil, funnel_queue: [], received_counter: 0, sent_counter: 0, opts: []]
+        @type t :: %Data{next: [pid], pid: pid, nid: atom, func: graph_func, funnel_queue: [term], received_counter: non_neg_integer, sent_counter: non_neg_integer, opts: [key: term]}
+        defstruct [next: [], pid: nil, nid: nil, func: nil, funnel_queue: [], received_counter: 0, sent_counter: 0, opts: []]
 
-    #TODO use counters
-  end
+        #TODO use counters
+      end
 
-  def start_link(opts \\ []) do
-    GenServer.start_link(__MODULE__, :ok, opts)
-  end
+      def start_link(opts \\ []) do
+        GenServer.start_link(__MODULE__, opts)
+      end
 
-  def init(params = [func: func, nid: nid]) do
-    opts = Keyword.drop(params, [:func, :type, :nid])
-    {:ok, %Data{func: func, pid: self, nid: nid, opts: opts}}
-  end
+      def init(params) do
+        func = Keyword.get(params, :func)
+        nid = Keyword.get(params, :nid)
+        opts = Keyword.drop(params, [:func, :type, :nid])
+        {:ok, %Data{func: func, pid: self, nid: nid, opts: opts}}
+      end
 
-  def handle_cast({:connect, to_pid}, data) do
-    new_data = update_in(data.next, fn(next) -> [to_pid | next] end)
-    {:noreply, new_data}
-  end
+      def handle_cast({:connect, to_pid}, data) do
+        new_data = update_in(data.next, fn(next) -> [to_pid | next] end)
+        {:noreply, new_data}
+      end
 
-  def handle_cast({:send_next, next, msg}, data) do
-    Enum.each(next, &(GenServer.cast(&1, {:next, self, msg})))
-    {:noreply, data}
-  end
+      def handle_cast({:send_next, next, msg}, data) do
+        Enum.each(next, &(GenServer.cast(&1, {:next, data, msg})))
+        {:noreply, data}
+      end
 
-  def send_next(pid, next, msg) do
-    GenServer.cast(pid, {:send_next, next, msg})
+      def send_next(pid, next, msg) do
+        GenServer.cast(pid, {:send_next, next, msg})
+      end
+    end
   end
 end
diff --git a/lib/exstreme/gnode/funnel.ex b/lib/exstreme/gnode/funnel.ex
index c80509d..2d9cb81 100644
--- a/lib/exstreme/gnode/funnel.ex
+++ b/lib/exstreme/gnode/funnel.ex
@@ -2,23 +2,21 @@ defmodule Exstreme.GNode.Funnel do
   use Exstreme.GNode.Behaviour
 
   def handle_cast({:next, from_data, msg}, data) do
-    {res, new_queue} =
+    {result, new_queue} =
       data.funnel_queue
       |> add_queue(from_data.nid, msg)
       |> get_queue(data.opts[:before_nodes])
-    send_message(res, data.next)
-    {:noreply, update_in(data.funnel_queue, new_queue)}
+    send_message(result, data)
+    {:noreply, update_in(data.funnel_queue, fn(_) -> new_queue end)}
   end
 
   #private
 
-  defp send_message(res, next) do
-    if res != nil do
-      new_msg =
-        res
-        |> Map.values
-        |> List.to_tuple
-      send_next(self, next, new_msg)
+  defp send_message(result, data) do
+    if result != nil do
+      new_msg = Map.values(result)
+      {:ok, result} = data.func.(new_msg, data)
+      send_next(self, data.next, result)
     end
   end
 
@@ -27,7 +25,7 @@ defmodule Exstreme.GNode.Funnel do
     if idx != nil do
       List.update_at(queue, idx, &(Map.put(&1, from, msg)))
     else
-      [queue | Map.new |> Map.put(from, msg)]
+      [Map.new |> Map.put(from, msg) | queue]
     end
   end
 
diff --git a/lib/exstreme/graph.ex b/lib/exstreme/graph.ex
index 26c8815..4252175 100644
--- a/lib/exstreme/graph.ex
+++ b/lib/exstreme/graph.ex
@@ -50,26 +50,40 @@ defmodule Exstreme.Graph do
     |> Enum.filter(is_first?)
   end
 
+  @doc """
+  """
+  @spec find_last_node(t) :: [atom]
+  def find_last_node(%Graph{nodes: nodes, connections: connections}) do
+    is_last? =
+      fn(node) ->
+        not(at_first?(connections, node)) and at_last?(connections, node)
+      end
+
+    nodes
+    |> Map.keys
+    |> Enum.filter(is_last?)
+  end
+
   @spec get_before_nodes(t, atom) :: [atom]
   def get_before_nodes(%Graph{connections: connections}, node) do
     compare_func =
-      fn(current_node, {_from, to}) ->
-        current_node == to
+      fn(current_node, {from, to}) ->
+        {current_node == to, from}
       end
     Enum.reduce(connections, [], fn(connection, res) ->
-      res ++ get_nodes_func(node, connection, res, compare_func)
-    end)
+      List.flatten(get_nodes_func(node, connection, res, compare_func), res)
+    end) |> Enum.uniq
   end
 
   @spec get_after_nodes(t, atom) :: [atom]
   def get_after_nodes(%Graph{nodes: nodes, connections: connections}, node) do
     compare_func =
-      fn(current_node, {from, _to}) ->
-        current_node == from
+      fn(current_node, {from, to}) ->
+        {current_node == from, to}
       end
     Enum.reduce(connections, [], fn(connection, res) ->
       res ++ get_nodes_func(node, connection, res, compare_func)
-    end)
+    end) |> Enum.uniq
   end
 
   # private
@@ -108,14 +122,15 @@ defmodule Exstreme.Graph do
   defp get_nodes_func(node, pair = {from, to}, res, func) do
     case to do
       to when is_atom(to) ->
-        if func.(node, pair) do
-          [res | node]
+        {ok, add_node} = func.(node, pair)
+        if ok do
+          [add_node | res]
         else
           res
         end
       to when is_list(to) ->
-        Enum.map(to, fn(current_to) ->
-          get_nodes_func(node, {from, current_to}, res, func)
+        Enum.reduce(to, res, fn(current_to, new_res) ->
+          List.flatten(get_nodes_func(node, {from, current_to}, new_res, func), new_res)
         end)
     end
   end
diff --git a/lib/exstreme/graph_builder.ex b/lib/exstreme/graph_builder.ex
index 654f31f..7c0026c 100644
--- a/lib/exstreme/graph_builder.ex
+++ b/lib/exstreme/graph_builder.ex
@@ -42,8 +42,9 @@ defmodule Exstreme.GraphBuilder do
     end)
   end
 
-  @spec start_node({atom, [key: any]}) :: {atom, [key: any]}
-  defp start_node({node, params = [type: type]}) do
+  @spec start_node({atom, [term: any]}) :: {atom, [key: any]}
+  defp start_node({node, params}) do
+    type = Keyword.get(params, :type)
     params = Keyword.put(params, :nid, node)
     {:ok, pid} =
       case type do
@@ -69,8 +70,8 @@ defmodule Exstreme.GraphBuilder do
 
   @spec connect_pair({atom, atom}, %{key: [key: term]}) :: no_return
   defp connect_pair({from, to}, nodes) when is_atom(to) do
-    [pid: pid_from] = nodes[from]
-    [pid: pid_to] = nodes[to]
+    pid_from = Keyword.get(nodes[from], :pid)
+    pid_to =  Keyword.get(nodes[to], :pid)
     GenServer.cast(pid_from, {:connect, pid_to})
   end
 end
diff --git a/test/exstreme/graph_builder_test.exs b/test/exstreme/graph_builder_test.exs
index 1f791df..fc61daa 100644
--- a/test/exstreme/graph_builder_test.exs
+++ b/test/exstreme/graph_builder_test.exs
@@ -2,8 +2,39 @@ defmodule Exstreme.GraphBuilderTest do
   use ExUnit.Case
   use Exstreme.Common
   alias Exstreme.GraphBuilder
+  alias Exstreme.Graph
   doctest Exstreme.GraphBuilder
 
-  test "" do
+  test "creates a graph" do
+    graph_built = GraphBuilder.build(create_graph)
+    assert graph_built != create_graph
+    Enum.each(graph_built.nodes, fn({_, params}) ->
+      assert Keyword.has_key?(params, :pid)
+      assert Keyword.has_key?(params, :after_nodes)
+      assert Keyword.has_key?(params, :before_nodes)
+      assert Keyword.get(params, :pid) != nil
+    end)
+  end
+
+  test "sends a message to the graph with common nodes" do
+    graph_built = GraphBuilder.build(create_graph)
+    [start_node] = Graph.find_start_node(graph_built)
+    [last_node] = Graph.find_last_node(graph_built)
+    start_node_pid = Keyword.get(graph_built.nodes[start_node], :pid)
+    last_node_pid = Keyword.get(graph_built.nodes[last_node], :pid)
+    GenServer.cast(last_node_pid, {:connect, self})
+    GenServer.cast(start_node_pid, {:next, self, {:sum, 0}})
+    assert_receive {_, {:next, last_node_pid, {:sum, 2}}}
+  end
+
+  test "sends a message to the graph with many nodes" do
+    graph_built = GraphBuilder.build(graph_many_nodes)
+    [start_node] = Graph.find_start_node(graph_built)
+    [last_node] = Graph.find_last_node(graph_built)
+    start_node_pid = Keyword.get(graph_built.nodes[start_node], :pid)
+    last_node_pid = Keyword.get(graph_built.nodes[last_node], :pid)
+    GenServer.cast(last_node_pid, {:connect, self})
+    GenServer.cast(start_node_pid, {:next, self, {:sum, 0}})
+    assert_receive {_, {:next, last_node_pid, {:sum, 7}}}
   end
 end
diff --git a/test/exstreme/graph_creator_test.exs b/test/exstreme/graph_creator_test.exs
index c126957..96321b7 100644
--- a/test/exstreme/graph_creator_test.exs
+++ b/test/exstreme/graph_creator_test.exs
@@ -7,7 +7,7 @@ defmodule Exstreme.GraphCreatorTest do
 
   test "creates a valid graph struct" do
     compare_graph = %Graph{
-      nodes: %{n1: [], n2: []},
+      nodes: %{n1: params, n2: params},
       connections: %{n1: :n2}
     }
     assert create_graph == compare_graph
@@ -36,7 +36,7 @@ defmodule Exstreme.GraphCreatorTest do
 
   test "can create n3 and add a relation between n2 and n3" do
     compare_graph = %Graph{
-      nodes: %{n1: [], n2: [], n3: []},
+      nodes: %{n1: params, n2: params, n3: params},
       connections: %{n1: :n2, n2: :n3}
     }
 
@@ -48,11 +48,11 @@ defmodule Exstreme.GraphCreatorTest do
 
   test "can add a broadcast an many nodes to the broadcast" do
     compare_graph = %Graph{
-      nodes: %{n1: [], n2: [], b1: [], n3: [], n4: []},
+      nodes: %{n1: params, n2: params, b1: params_broadcast, n3: params, n4: params},
       connections: %{n1: :n2, n2: :b1, b1: [:n4, :n3]}
     }
 
-    {graph, b1} = GraphCreator.create_broadcast(create_graph, params)
+    {graph, b1} = GraphCreator.create_broadcast(create_graph, params_broadcast)
     {graph, n3} = GraphCreator.create_node(graph, params)
     {graph, n4} = GraphCreator.create_node(graph, params)
 
@@ -67,14 +67,14 @@ defmodule Exstreme.GraphCreatorTest do
 
   test "can add a funnel" do
     compare_graph = %Graph{
-      nodes: %{n1: [], n2: [], b1: [], n3: [], n4: [], f1: [], n5: []},
+      nodes: %{n1: params, n2: params, b1: params_broadcast, n3: params, n4: params, f1: params_funnel, n5: params},
       connections: %{n1: :n2, n2: :b1, b1: [:n4, :n3], n3: :f1, n4: :f1, f1: :n5}
     }
 
-    {graph, b1} = GraphCreator.create_broadcast(create_graph, params)
+    {graph, b1} = GraphCreator.create_broadcast(create_graph, params_broadcast)
     {graph, n3} = GraphCreator.create_node(graph, params)
     {graph, n4} = GraphCreator.create_node(graph, params)
-    {graph, f1} = GraphCreator.create_funnel(graph, params)
+    {graph, f1} = GraphCreator.create_funnel(graph, params_funnel)
     {graph, n5} = GraphCreator.create_node(graph, params)
 
     new_graph =
diff --git a/test/exstreme/graph_test.exs b/test/exstreme/graph_test.exs
index 560a95d..87164b2 100644
--- a/test/exstreme/graph_test.exs
+++ b/test/exstreme/graph_test.exs
@@ -17,7 +17,17 @@ defmodule Exstreme.GraphTest do
     assert Graph.find_start_node(graph_many_nodes) == [:n1]
   end
 
-  test "" do
-    assert Graph.get_before_nodes(graph_many_nodes, :f1) == [:n3, :n4]
+  test "the last node is n5" do
+    assert Graph.find_last_node(graph_many_nodes) == [:n5]
+  end
+
+  test "the nodes before f1 are n4 and n3" do
+    res = Graph.get_before_nodes(graph_many_nodes, :f1)
+    assert res == [:n4, :n3]
+  end
+
+  test "the nodes after f1 are n4 and n3" do
+    res = Graph.get_after_nodes(graph_many_nodes, :f1)
+    assert res == [:n5]
   end
 end
diff --git a/test/support/common.ex b/test/support/common.ex
index 49d6488..d73c7e2 100644
--- a/test/support/common.ex
+++ b/test/support/common.ex
@@ -5,13 +5,13 @@ defmodule Exstreme.Common do
   using do
     quote do
       def graph_many_nodes do
-        graph = GraphCreator.create_graph(params)
+        graph = GraphCreator.create_graph([])
         {graph, n1} = GraphCreator.create_node(graph, params)
         {graph, n2} = GraphCreator.create_node(graph, params)
-        {graph, b1} = GraphCreator.create_broadcast(graph, params)
+        {graph, b1} = GraphCreator.create_broadcast(graph, params_broadcast)
         {graph, n3} = GraphCreator.create_node(graph, params)
         {graph, n4} = GraphCreator.create_node(graph, params)
-        {graph, f1} = GraphCreator.create_funnel(graph, params)
+        {graph, f1} = GraphCreator.create_funnel(graph, params_funnel)
         {graph, n5} = GraphCreator.create_node(graph, params)
 
         graph
@@ -27,29 +27,29 @@ defmodule Exstreme.Common do
       # invalid graphs
 
       def graph_one_node_no_connections do
-        graph = GraphCreator.create_graph(params)
+        graph = GraphCreator.create_graph([])
         {graph, _n1} = GraphCreator.create_node(graph, params)
         graph
       end
 
-      def graph_no_connections, do: GraphCreator.create_graph(params)
+      def graph_no_connections, do: GraphCreator.create_graph([])
 
       def graph_start_with_broadcast do
-        graph = GraphCreator.create_graph(params)
-        {graph, b1} = GraphCreator.create_broadcast(graph, params)
+        graph = GraphCreator.create_graph([])
+        {graph, b1} = GraphCreator.create_broadcast(graph, params_broadcast)
         {graph, n1} = GraphCreator.create_node(graph, params)
         GraphCreator.add_connection(graph, b1, n1)
       end
 
       def graph_start_with_funnnel do
-        graph = GraphCreator.create_graph(params)
-        {graph, f1} = GraphCreator.create_funnel(graph, params)
+        graph = GraphCreator.create_graph([])
+        {graph, f1} = GraphCreator.create_funnel(graph, params_funnel)
         {graph, n1} = GraphCreator.create_node(graph, params)
         GraphCreator.add_connection(graph, f1, n1)
       end
 
       def graph_unconnected_nodes do
-        graph = GraphCreator.create_graph(params)
+        graph = GraphCreator.create_graph([])
         {graph, n1} = GraphCreator.create_node(graph, params)
         {graph, n2} = GraphCreator.create_node(graph, params)
         {graph, _n3} = GraphCreator.create_node(graph, params)
@@ -57,13 +57,17 @@ defmodule Exstreme.Common do
       end
 
       defp create_graph do
-        graph = GraphCreator.create_graph(params)
+        graph = GraphCreator.create_graph([])
         {graph, n1} = GraphCreator.create_node(graph, params)
         {graph, n2} = GraphCreator.create_node(graph, params)
         GraphCreator.add_connection(graph, n1, n2)
       end
 
-      def params, do: []
+      def params, do: [type: :common, func: fn({:sum, acc}, _) -> {:ok, {:sum, acc + 1}} end]
+
+      def params_funnel, do: [type: :funnel, func: fn(values, _) -> {:ok, {:sum, Enum.reduce(values, 0, fn({:sum, num}, acc) -> num + acc end)}} end]
+
+      def params_broadcast, do: [type: :broadcast]
     end
   end
 end