diff --git a/lib/philomena/tags.ex b/lib/philomena/tags.ex
index 00385fda..511d265e 100644
--- a/lib/philomena/tags.ex
+++ b/lib/philomena/tags.ex
@@ -101,4 +101,100 @@ defmodule Philomena.Tags do
   def change_tag(%Tag{} = tag) do
     Tag.changeset(tag, %{})
   end
+
+  alias Philomena.Tags.Implication
+
+  @doc """
+  Returns the list of tags_implied_tags.
+
+  ## Examples
+
+      iex> list_tags_implied_tags()
+      [%Implication{}, ...]
+
+  """
+  def list_tags_implied_tags do
+    Repo.all(Implication)
+  end
+
+  @doc """
+  Gets a single implication.
+
+  Raises `Ecto.NoResultsError` if the Implication does not exist.
+
+  ## Examples
+
+      iex> get_implication!(123)
+      %Implication{}
+
+      iex> get_implication!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_implication!(id), do: Repo.get!(Implication, id)
+
+  @doc """
+  Creates a implication.
+
+  ## Examples
+
+      iex> create_implication(%{field: value})
+      {:ok, %Implication{}}
+
+      iex> create_implication(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_implication(attrs \\ %{}) do
+    %Implication{}
+    |> Implication.changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Updates a implication.
+
+  ## Examples
+
+      iex> update_implication(implication, %{field: new_value})
+      {:ok, %Implication{}}
+
+      iex> update_implication(implication, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_implication(%Implication{} = implication, attrs) do
+    implication
+    |> Implication.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a Implication.
+
+  ## Examples
+
+      iex> delete_implication(implication)
+      {:ok, %Implication{}}
+
+      iex> delete_implication(implication)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_implication(%Implication{} = implication) do
+    Repo.delete(implication)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking implication changes.
+
+  ## Examples
+
+      iex> change_implication(implication)
+      %Ecto.Changeset{source: %Implication{}}
+
+  """
+  def change_implication(%Implication{} = implication) do
+    Implication.changeset(implication, %{})
+  end
 end
diff --git a/lib/philomena/tags/implication.ex b/lib/philomena/tags/implication.ex
new file mode 100644
index 00000000..2cba7872
--- /dev/null
+++ b/lib/philomena/tags/implication.ex
@@ -0,0 +1,18 @@
+defmodule Philomena.Tags.Implication do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @primary_key false
+
+  schema "tags_implied_tags" do
+    belongs_to :tag, Philomena.Tags.Tag, primary_key: true
+    belongs_to :implied_tag, Philomena.Tags.Tag, primary_key: true
+  end
+
+  @doc false
+  def changeset(implication, attrs) do
+    implication
+    |> cast(attrs, [])
+    |> validate_required([])
+  end
+end
diff --git a/test/philomena/tags_test.exs b/test/philomena/tags_test.exs
index b5b3f8b3..78b41e87 100644
--- a/test/philomena/tags_test.exs
+++ b/test/philomena/tags_test.exs
@@ -59,4 +59,61 @@ defmodule Philomena.TagsTest do
       assert %Ecto.Changeset{} = Tags.change_tag(tag)
     end
   end
+
+  describe "tags_implied_tags" do
+    alias Philomena.Tags.Implication
+
+    @valid_attrs %{}
+    @update_attrs %{}
+    @invalid_attrs %{}
+
+    def implication_fixture(attrs \\ %{}) do
+      {:ok, implication} =
+        attrs
+        |> Enum.into(@valid_attrs)
+        |> Tags.create_implication()
+
+      implication
+    end
+
+    test "list_tags_implied_tags/0 returns all tags_implied_tags" do
+      implication = implication_fixture()
+      assert Tags.list_tags_implied_tags() == [implication]
+    end
+
+    test "get_implication!/1 returns the implication with given id" do
+      implication = implication_fixture()
+      assert Tags.get_implication!(implication.id) == implication
+    end
+
+    test "create_implication/1 with valid data creates a implication" do
+      assert {:ok, %Implication{} = implication} = Tags.create_implication(@valid_attrs)
+    end
+
+    test "create_implication/1 with invalid data returns error changeset" do
+      assert {:error, %Ecto.Changeset{}} = Tags.create_implication(@invalid_attrs)
+    end
+
+    test "update_implication/2 with valid data updates the implication" do
+      implication = implication_fixture()
+      assert {:ok, %Implication{} = implication} = Tags.update_implication(implication, @update_attrs)
+    end
+
+    test "update_implication/2 with invalid data returns error changeset" do
+      implication = implication_fixture()
+      assert {:error, %Ecto.Changeset{}} = Tags.update_implication(implication, @invalid_attrs)
+      assert implication == Tags.get_implication!(implication.id)
+    end
+
+    test "delete_implication/1 deletes the implication" do
+      implication = implication_fixture()
+      assert {:ok, %Implication{}} = Tags.delete_implication(implication)
+      assert_raise Ecto.NoResultsError, fn -> Tags.get_implication!(implication.id) end
+    end
+
+    test "change_implication/1 returns a implication changeset" do
+      implication = implication_fixture()
+      assert %Ecto.Changeset{} = Tags.change_implication(implication)
+    end
+  end
 end