diff --git a/arrays_strings/permutation/permutation_challenge.ipynb b/arrays_strings/permutation/permutation_challenge.ipynb
index 7799abe..4125371 100644
--- a/arrays_strings/permutation/permutation_challenge.ipynb
+++ b/arrays_strings/permutation/permutation_challenge.ipynb
@@ -84,9 +84,11 @@
    },
    "outputs": [],
    "source": [
-    "def permutations(str1, str2):\n",
-    "    # TODO: Implement me\n",
-    "    pass"
+    "class Permutations(object):\n",
+    "\n",
+    "    def is_permutation(self, str1, str2):\n",
+    "        # TODO: Implement me\n",
+    "        pass"
    ]
   },
   {
@@ -130,9 +132,11 @@
     "\n",
     "def main():\n",
     "    test = TestPermutation()\n",
-    "    test.test_permutation(permutations)\n",
+    "    permutations = Permutations()\n",
+    "    test.test_permutation(permutations.is_permutation)\n",
     "    try:\n",
-    "        test.test_permutation(permutations_alt)\n",
+    "        permutations_alt = PermutationsAlt()\n",
+    "        test.test_permutation(permutations_alt.is_permutation)\n",
     "    except NameError:\n",
     "        # Alternate solutions are only defined\n",
     "        # in the solutions file\n",
diff --git a/arrays_strings/permutation/permutation_solution.ipynb b/arrays_strings/permutation/permutation_solution.ipynb
index 92630bc..b36f333 100644
--- a/arrays_strings/permutation/permutation_solution.ipynb
+++ b/arrays_strings/permutation/permutation_solution.ipynb
@@ -95,10 +95,12 @@
    },
    "outputs": [],
    "source": [
-    "def permutations(str1, str2):\n",
-    "    if str1 is None or str2 is None:\n",
-    "        return False\n",
-    "    return sorted(str1) == sorted(str2)"
+    "class Permutations(object):\n",
+    "\n",
+    "    def is_permutation(self, str1, str2):\n",
+    "        if str1 is None or str2 is None:\n",
+    "            return False\n",
+    "        return sorted(str1) == sorted(str2)"
    ]
   },
   {
@@ -147,18 +149,20 @@
     "from collections import defaultdict\n",
     "\n",
     "\n",
-    "def permutations_alt(str1, str2):\n",
-    "    if str1 is None or str2 is None:\n",
-    "        return False\n",
-    "    if len(str1) != len(str2):\n",
-    "        return False\n",
-    "    unique_counts1 = defaultdict(int)\n",
-    "    unique_counts2 = defaultdict(int)\n",
-    "    for char in str1:\n",
-    "        unique_counts1[char] += 1\n",
-    "    for char in str2:\n",
-    "        unique_counts2[char] += 1\n",
-    "    return unique_counts1 == unique_counts2"
+    "class PermutationsAlt(object):\n",
+    "\n",
+    "    def is_permutation(self, str1, str2):\n",
+    "        if str1 is None or str2 is None:\n",
+    "            return False\n",
+    "        if len(str1) != len(str2):\n",
+    "            return False\n",
+    "        unique_counts1 = defaultdict(int)\n",
+    "        unique_counts2 = defaultdict(int)\n",
+    "        for char in str1:\n",
+    "            unique_counts1[char] += 1\n",
+    "        for char in str2:\n",
+    "            unique_counts2[char] += 1\n",
+    "        return unique_counts1 == unique_counts2"
    ]
   },
   {
@@ -201,9 +205,11 @@
     "\n",
     "def main():\n",
     "    test = TestPermutation()\n",
-    "    test.test_permutation(permutations)\n",
+    "    permutations = Permutations()\n",
+    "    test.test_permutation(permutations.is_permutation)\n",
     "    try:\n",
-    "        test.test_permutation(permutations_alt)\n",
+    "        permutations_alt = PermutationsAlt()\n",
+    "        test.test_permutation(permutations_alt.is_permutation)\n",
     "    except NameError:\n",
     "        # Alternate solutions are only defined\n",
     "        # in the solutions file\n",
@@ -225,6 +231,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
+      "Success: test_permutation\n",
       "Success: test_permutation\n"
      ]
     }
@@ -250,7 +257,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.4.3"
+   "version": "3.5.0"
   }
  },
  "nbformat": 4,
diff --git a/arrays_strings/permutation/test_permutation_solution.py b/arrays_strings/permutation/test_permutation_solution.py
index 23929a5..8320cfd 100644
--- a/arrays_strings/permutation/test_permutation_solution.py
+++ b/arrays_strings/permutation/test_permutation_solution.py
@@ -14,9 +14,11 @@ class TestPermutation(object):
 
 def main():
     test = TestPermutation()
-    test.test_permutation(permutations)
+    permutations = Permutations()
+    test.test_permutation(permutations.is_permutation)
     try:
-        test.test_permutation(permutations_alt)
+        permutations_alt = PermutationsAlt()
+        test.test_permutation(permutations_alt.is_permutation)
     except NameError:
         # Alternate solutions are only defined
         # in the solutions file