diff --git a/lib/advent_code2024/day1.ex b/lib/advent_code2024/day1.ex
index e8f8cfc..2cd17ad 100644
--- a/lib/advent_code2024/day1.ex
+++ b/lib/advent_code2024/day1.ex
@@ -1,4 +1,5 @@
 defmodule AdventCode2024.Day1 do
+  @behaviour AdventCode2024.Solution
   @moduledoc """
   Solution for Advent of Code 2024 - Day 1: Historian Hysteria
 
diff --git a/lib/advent_code2024/solution.ex b/lib/advent_code2024/solution.ex
new file mode 100644
index 0000000..ce10e68
--- /dev/null
+++ b/lib/advent_code2024/solution.ex
@@ -0,0 +1,29 @@
+defmodule AdventCode2024.Solution do
+  @moduledoc """
+  Behaviour module defining the interface for Advent of Code daily solutions.
+  """
+
+  @doc """
+  Solves Part 1 of a daily challenge.
+  
+  ## Parameters
+    - input_file: Path to input file
+    
+  ## Returns
+    - `{:ok, result}` where result is the solution
+    - `{:error, reason}` if processing fails
+  """
+  @callback solve(input_file :: String.t()) :: {:ok, any()} | {:error, String.t()}
+
+  @doc """
+  Solves Part 2 of a daily challenge.
+  
+  ## Parameters
+    - input_file: Path to input file
+    
+  ## Returns
+    - `{:ok, result}` where result is the solution
+    - `{:error, reason}` if processing fails
+  """
+  @callback solve_part2(input_file :: String.t()) :: {:ok, any()} | {:error, String.t()}
+end