diff --git a/lib/cklist/accounts/user.ex b/lib/cklist/accounts/user.ex
index 9447257..0c42bb7 100644
--- a/lib/cklist/accounts/user.ex
+++ b/lib/cklist/accounts/user.ex
@@ -8,6 +8,8 @@ defmodule Cklist.Accounts.User do
     field :hashed_password, :string, redact: true
     field :confirmed_at, :naive_datetime
 
+    has_many :checklists, Cklist.Checklists.Checklist
+
     timestamps(type: :utc_datetime)
   end
 
diff --git a/lib/cklist/checklists.ex b/lib/cklist/checklists.ex
index 12e315f..ca8207b 100644
--- a/lib/cklist/checklists.ex
+++ b/lib/cklist/checklists.ex
@@ -4,9 +4,10 @@ defmodule Cklist.Checklists do
   """
 
   import Ecto.Query, warn: false
-  alias Cklist.Repo
-
+  alias Cklist.Checklists.Run
+  alias Cklist.Checklists.Activity
   alias Cklist.Checklists.Checklist
+  alias Cklist.Repo
 
   @doc """
   Returns the list of checklists.
@@ -107,4 +108,35 @@ defmodule Cklist.Checklists do
   def change_checklist(%Checklist{} = checklist, attrs \\ %{}) do
     Checklist.changeset(checklist, attrs)
   end
+
+  def log_run_start(checklist, user) do
+    {:ok, run} = %Run{}
+      |> Run.changeset(%{checklist_id: checklist.id})
+      |> Repo.insert()
+
+    %Activity{}
+      |> Activity.changeset(%{run_id: run.id, user_id: user.id, event: %{type: "checklist_start"}})
+      |> Repo.insert()
+
+    # return current run
+    run
+  end
+
+  def log_run_abort(run, user) do
+    %Activity{}
+      |> Activity.changeset(%{run_id: run.id, user_id: user.id, event: %{type: "checklist_abort"}})
+      |> Repo.insert()
+  end
+
+  def log_run_complete(run, user) do
+    %Activity{}
+      |> Activity.changeset(%{run_id: run.id, user_id: user.id, event: %{type: "checklist_complete"}})
+      |> Repo.insert()
+  end
+
+  def log_step_complete(run, user, step_id, is_done \\ true) do
+    %Activity{}
+      |> Activity.changeset(%{run_id: run.id, user_id: user.id, event: %{type: "step_done", step_id: step_id, done: is_done}})
+      |> Repo.insert()
+  end
 end
diff --git a/lib/cklist/checklists/activity.ex b/lib/cklist/checklists/activity.ex
new file mode 100644
index 0000000..2923100
--- /dev/null
+++ b/lib/cklist/checklists/activity.ex
@@ -0,0 +1,22 @@
+defmodule Cklist.Checklists.Activity do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  schema "activity" do
+    # We assume events have a type. Any other properties are optional and type-dependent.
+    field :event, :map
+
+    belongs_to :run, Cklist.Checklists.Run
+    belongs_to :user, Cklist.Accounts.User
+
+    # We don't expect activities to be modified.
+    timestamps([type: :utc_datetime, updated_at: false])
+  end
+
+  @doc false
+  def changeset(activity, attrs) do
+    activity
+    |> cast(attrs, [:event, :run_id, :user_id])
+    |> validate_required([:event, :run_id, :user_id])
+  end
+end
diff --git a/lib/cklist/checklists/checklist.ex b/lib/cklist/checklists/checklist.ex
index 7f86ecc..3b618d3 100644
--- a/lib/cklist/checklists/checklist.ex
+++ b/lib/cklist/checklists/checklist.ex
@@ -6,9 +6,11 @@ defmodule Cklist.Checklists.Checklist do
     field :description, :string
     field :title, :string
     field :document, :map
-    field :user_id, :id
     field :access, Ecto.Enum, values: [:public, :personal]
 
+    belongs_to :user, Cklist.Accounts.User
+    has_many :runs, Cklist.Checklists.Run
+
     timestamps(type: :utc_datetime)
   end
 
diff --git a/lib/cklist/checklists/run.ex b/lib/cklist/checklists/run.ex
new file mode 100644
index 0000000..7b22ada
--- /dev/null
+++ b/lib/cklist/checklists/run.ex
@@ -0,0 +1,16 @@
+defmodule Cklist.Checklists.Run do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  schema "runs" do
+    belongs_to :checklist, Cklist.Checklists.Checklist
+    has_many :activities, Cklist.Checklists.Activity
+  end
+
+    @doc false
+    def changeset(run, attrs) do
+      run
+      |> cast(attrs, [:checklist_id])
+      |> validate_required([:checklist_id])
+    end
+end
diff --git a/lib/cklist_web/live/cklist_run_live.ex b/lib/cklist_web/live/cklist_run_live.ex
index 02c528a..2d10f18 100644
--- a/lib/cklist_web/live/cklist_run_live.ex
+++ b/lib/cklist_web/live/cklist_run_live.ex
@@ -8,9 +8,14 @@ defmodule CklistWeb.CklistRunLive do
   end
 
   def mount(%{"id" => id}, _session, socket) do
+    user = socket.assigns.current_user
+
     checklist = Checklists.get_checklist!(id)
+    run = Checklists.log_run_start(checklist, user)
+
     socket = socket
       |> assign(:checklist, checklist)
+      |> assign(:run, run)
       |> assign(:steps, length(checklist.document["steps"]))
       |> assign(:steps_done, 0)
       |> assign(:completed, false)
@@ -21,21 +26,9 @@ defmodule CklistWeb.CklistRunLive do
     {:ok, socket}
   end
 
-  def handle_event("step_done", params, %{assigns: assigns} = socket) do
-    [step_name] = params["_target"]
-    updated_state = Map.put(assigns.step_state, step_name, Map.get(params, step_name) == "true")
-    updated_steps_done = Enum.reduce(updated_state,  0, &is_done/2)
-
-    {
-      :noreply,
-      socket
-      |> assign(:step_state, updated_state)
-      |> assign(:steps_done, updated_steps_done)
-      |> assign(:completed, updated_steps_done === assigns.steps)
-    }
-  end
-
+  # Handles aborting a checklist.
   def handle_event("abort", _params, %{assigns: assigns} = socket) do
+    Checklists.log_run_abort(assigns.run, assigns.current_user)
     {
       :noreply,
       socket
@@ -44,6 +37,7 @@ defmodule CklistWeb.CklistRunLive do
     }
   end
 
+  # Handles "next_step" event for sequential checklists.
   def handle_event("next_step", _params, %{assigns: assigns} = socket) do
     case assigns.completed do
       true ->
@@ -54,19 +48,47 @@ defmodule CklistWeb.CklistRunLive do
           |> redirect(to: ~p"/checklists/#{assigns.checklist}")
         }
       false ->
+        Checklists.log_step_complete(assigns.run, assigns.current_user, assigns.steps_done)
         updated_steps_done = assigns.steps_done + 1
         completed = assigns.steps === updated_steps_done
+        if completed do
+          Checklists.log_run_complete(assigns.run, assigns.current_user)
+        end
         {
         :noreply,
         socket
-          |> assign(:steps_done, updated_steps_done)
           |> assign(:current_step, Enum.at(assigns.checklist.document["steps"], updated_steps_done))
           |> assign(:next_step, Enum.at(assigns.checklist.document["steps"], updated_steps_done + 1))
+          |> assign(:steps_done, updated_steps_done)
           |> assign(:completed, completed)
         }
     end
   end
 
+  # Handles "step_done" events for non-sequential checklists.
+  def handle_event("step_done", params, %{assigns: assigns} = socket) do
+    [step_name] = params["_target"]
+    is_done = Map.get(params, step_name) == "true"
+    updated_state = Map.put(assigns.step_state, step_name, is_done)
+    updated_steps_done = Enum.reduce(updated_state,  0, &is_done/2)
+
+    step_id = Enum.find_index(assigns.checklist.document["steps"], &(&1["name"] == step_name))
+    Checklists.log_step_complete(assigns.run, assigns.current_user, step_id, is_done)
+
+    completed = updated_steps_done === assigns.steps
+    if completed do
+      Checklists.log_run_complete(assigns.run, assigns.current_user)
+    end
+
+    {
+      :noreply,
+      socket
+      |> assign(:step_state, updated_state)
+      |> assign(:steps_done, updated_steps_done)
+      |> assign(:completed, completed)
+    }
+  end
+
   defp is_done({_, true}, count), do: count + 1
   defp is_done(_, count), do: count
 end
diff --git a/priv/repo/migrations/20240310152508_create_checklist_run.exs b/priv/repo/migrations/20240310152508_create_checklist_run.exs
new file mode 100644
index 0000000..55b40cb
--- /dev/null
+++ b/priv/repo/migrations/20240310152508_create_checklist_run.exs
@@ -0,0 +1,9 @@
+defmodule Cklist.Repo.Migrations.CreateChecklistRun do
+  use Ecto.Migration
+
+  def change do
+    create table(:runs) do
+      add :checklist_id, references(:checklists)
+    end
+  end
+end
diff --git a/priv/repo/migrations/20240310153254_create_activity_log.exs b/priv/repo/migrations/20240310153254_create_activity_log.exs
new file mode 100644
index 0000000..78af720
--- /dev/null
+++ b/priv/repo/migrations/20240310153254_create_activity_log.exs
@@ -0,0 +1,14 @@
+defmodule Cklist.Repo.Migrations.CreateActivityLog do
+  use Ecto.Migration
+
+  def change do
+    create table(:activity) do
+      add :event, :map
+
+      add :user_id, references(:users)
+      add :run_id, references(:runs)
+
+      timestamps([type: :utc_datetime, updated_at: false])
+    end
+  end
+end