diff --git a/TinCan/ContextActivities.cs b/TinCan/ContextActivities.cs
index e329cd7..a024c9f 100644
--- a/TinCan/ContextActivities.cs
+++ b/TinCan/ContextActivities.cs
@@ -35,29 +35,60 @@ public ContextActivities(JObject jobj)
             if (jobj["parent"] != null)
             {
                 parent = new List<Activity>();
-                foreach (JObject jactivity in jobj["parent"]) {
-                    parent.Add((Activity)jactivity);
+                if (jobj["parent"].Type == JTokenType.Array)
+                {
+                    foreach (JObject jactivity in jobj["parent"]) {
+                        parent.Add((Activity)jactivity);
+                    }
+                }
+                else
+                {
+                    parent.Add((Activity)jobj["parent"]);
                 }
             }
             if (jobj["grouping"] != null)
             {
                 grouping = new List<Activity>();
-                foreach (JObject jactivity in jobj["grouping"]) {
-                    grouping.Add((Activity)jactivity);
+                if (jobj["grouping"].Type == JTokenType.Array)
+                {
+                    foreach (JObject jactivity in jobj["grouping"])
+                    {
+                        grouping.Add((Activity)jactivity);
+                    }
+                }
+                else
+                {
+                    grouping.Add((Activity)jobj["grouping"]);
                 }
             }
             if (jobj["category"] != null)
             {
                 category = new List<Activity>();
-                foreach (JObject jactivity in jobj["category"]) {
-                    category.Add((Activity)jactivity);
+                if (jobj["category"].Type == JTokenType.Array)
+                {
+                    foreach (JObject jactivity in jobj["category"])
+                    {
+                        category.Add((Activity)jactivity);
+                    }
+                }
+                else
+                {
+                    category.Add((Activity)jobj["category"]);
                 }
             }
             if (jobj["other"] != null)
             {
                 other = new List<Activity>();
-                foreach (JObject jactivity in jobj["other"]) {
-                    other.Add((Activity)jactivity);
+                if (jobj["other"].Type == JTokenType.Array)
+                {
+                    foreach (JObject jactivity in jobj["other"])
+                    {
+                        other.Add((Activity)jactivity);
+                    }
+                }
+                else
+                {
+                    other.Add((Activity)jobj["other"]);
                 }
             }
         }
diff --git a/TinCanTests/ContextActivitiesTest.cs b/TinCanTests/ContextActivitiesTest.cs
new file mode 100644
index 0000000..b069313
--- /dev/null
+++ b/TinCanTests/ContextActivitiesTest.cs
@@ -0,0 +1,82 @@
+/*
+    Copyright 2018 Rustici Software
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+*/
+namespace TinCanTests
+{
+    using System.Collections.Generic;
+    using NUnit.Framework;
+    using TinCan;
+    using TinCan.Json;
+
+    [TestFixture]
+    class ContextActivitiesTest
+    {
+        private Activity sampleActivity1 = new Activity
+        {
+            id = "http://0.bar/"
+        };
+
+        private Activity sampleActivity2 = new Activity
+        {
+            id = "http://1.bar/"
+        };
+
+        [Test]
+        public void ConstructorWithObject()
+        {
+            var json = "{" +
+                "\"parent\": " + sampleActivity1.ToJSON() + "," +
+                "\"grouping\": " + sampleActivity1.ToJSON() + "," +
+                "\"category\": " + sampleActivity1.ToJSON() + "," +
+                "\"other\": " + sampleActivity1.ToJSON() +
+            "}";
+
+            ContextActivities contextActivities = new ContextActivities(new StringOfJSON(json));
+
+            ValidateActivityList(contextActivities.parent, 1);
+            ValidateActivityList(contextActivities.grouping, 1);
+            ValidateActivityList(contextActivities.category, 1);
+            ValidateActivityList(contextActivities.other, 1);
+        }
+
+        [Test]
+        public void ConstructorWithArray()
+        {
+            var json = "{" +
+                "\"parent\": [" + sampleActivity1.ToJSON() + ", " + sampleActivity2.ToJSON() + "]," +
+                "\"grouping\": [" + sampleActivity1.ToJSON() + ", " + sampleActivity2.ToJSON() + "]," +
+                "\"category\": [" + sampleActivity1.ToJSON() + ", " + sampleActivity2.ToJSON() + "]," +
+                "\"other\": [" + sampleActivity1.ToJSON() + ", " + sampleActivity2.ToJSON() + "]" +
+            "}";
+
+            ContextActivities contextActivities = new ContextActivities(new StringOfJSON(json));
+
+            ValidateActivityList(contextActivities.parent, 2);
+            ValidateActivityList(contextActivities.grouping, 2);
+            ValidateActivityList(contextActivities.category, 2);
+            ValidateActivityList(contextActivities.other, 2);
+        }
+
+        private void ValidateActivityList(List<Activity> list, int expectedLength)
+        {
+            Assert.IsTrue(list.Count == expectedLength);
+
+            for (int i = 0; i < list.Count; i++)
+            {
+                Assert.IsTrue(list[i].id == "http://" + i + ".bar/");
+            }
+        }
+    }
+}
diff --git a/TinCanTests/TinCanTests.csproj b/TinCanTests/TinCanTests.csproj
index d43e39e..7ebab24 100644
--- a/TinCanTests/TinCanTests.csproj
+++ b/TinCanTests/TinCanTests.csproj
@@ -88,6 +88,7 @@
   <ItemGroup>
     <Compile Include="ActivityTest.cs" />
     <Compile Include="AgentTest.cs" />
+    <Compile Include="ContextActivitiesTest.cs" />
     <Compile Include="ContextTest.cs" />
     <Compile Include="ResultTest.cs" />
     <Compile Include="Support.cs" />