diff --git a/src/main/java/org/onosproject/t3/api/GroupsInDevice.java b/src/main/java/org/onosproject/t3/api/GroupsInDevice.java
new file mode 100644
index 0000000..3cfb41a
--- /dev/null
+++ b/src/main/java/org/onosproject/t3/api/GroupsInDevice.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2017-present Open Networking Foundation
+ *
+ * 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.
+ */
+
+package org.onosproject.t3.api;
+
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.flow.TrafficSelector;
+import org.onosproject.net.group.Group;
+
+import java.util.List;
+
+/**
+ * Class to represent the groups in a device for a given output and packet.
+ */
+//FIXME consider removing.
+public class GroupsInDevice {
+
+    private ConnectPoint output;
+    private List<Group> groups;
+    private TrafficSelector selector;
+
+    /**
+     * Saves the given groups for the output connect point and the selector.
+     * @param output the output connect point
+     * @param groups the groups
+     * @param selector the selector representing the final packet
+     */
+    public GroupsInDevice(ConnectPoint output, List<Group> groups, TrafficSelector selector) {
+
+        this.output = output;
+        this.groups = groups;
+        this.selector = selector;
+    }
+
+    /**
+     * Returns the output connect point.
+     * @return the connect point
+     */
+    public ConnectPoint getOutput() {
+        return output;
+    }
+
+    /**
+     * Returns the groups.
+     * @return groups.
+     */
+    public List<Group> getGroups() {
+        return groups;
+    }
+
+    /**
+     * Returns the final packet after traversing the network.
+     * @return the selector with packet info
+     */
+    public TrafficSelector getFinalPacket() {
+        return selector;
+    }
+
+    @Override
+    public String toString() {
+        return "GroupsInDevice{" +
+                "output=" + output +
+                ", groups=" + groups +
+                ", selector=" + selector +
+                '}';
+    }
+
+}
diff --git a/src/main/java/org/onosproject/t3/api/StaticPacketTrace.java b/src/main/java/org/onosproject/t3/api/StaticPacketTrace.java
index e6ee8e8..cfc6371 100644
--- a/src/main/java/org/onosproject/t3/api/StaticPacketTrace.java
+++ b/src/main/java/org/onosproject/t3/api/StaticPacketTrace.java
@@ -16,10 +16,153 @@
 
 package org.onosproject.t3.api;
 
+import org.onosproject.net.ConnectPoint;
+import org.onosproject.net.DeviceId;
+import org.onosproject.net.flow.FlowEntry;
+import org.onosproject.net.flow.TrafficSelector;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
 /**
  * Encapsulates the result of tracing a packet (traffic selector) through
  * the current topology.
  */
 public class StaticPacketTrace {
 
+    private final TrafficSelector inPacket;
+    private final ConnectPoint in;
+    List<List<ConnectPoint>> completePaths;
+    private Map<DeviceId, List<GroupsInDevice>> outputsForDevice;
+    private Map<DeviceId, List<FlowEntry>> flowsForDevice;
+    private StringBuilder resultMessage;
+
+    /**
+     * Builds the trace with a given packet and a connect point.
+     *
+     * @param packet the packet to trace
+     * @param in     the initial connect point
+     */
+    public StaticPacketTrace(TrafficSelector packet, ConnectPoint in) {
+        this.inPacket = packet;
+        this.in = in;
+        completePaths = new ArrayList<>();
+        outputsForDevice = new HashMap<>();
+        flowsForDevice = new HashMap<>();
+        resultMessage = new StringBuilder();
+    }
+
+    /**
+     * Return the initial packet.
+     *
+     * @return the initial packet in the form of a selector.
+     */
+    public TrafficSelector getInitialPacket() {
+        return inPacket;
+    }
+
+    /**
+     * Returns the first connect point the packet came in through.
+     *
+     * @return the connect point
+     */
+    public ConnectPoint getInitialConnectPoint() {
+        return in;
+    }
+
+    /**
+     * Add a result message for the Trace.
+     *
+     * @param resultMessage the message
+     */
+    public void addResultMessage(String resultMessage) {
+        if (this.resultMessage.length() != 0) {
+            this.resultMessage.append("\n");
+        }
+        this.resultMessage.append(resultMessage);
+    }
+
+    /**
+     * Return the result message.
+     *
+     * @return the message
+     */
+    public String resultMessage() {
+        return resultMessage.toString();
+    }
+
+    /**
+     * Adds the groups for a given device.
+     *
+     * @param deviceId   the device
+     * @param outputPath the groups in device objects
+     */
+    public void addGroupOutputPath(DeviceId deviceId, GroupsInDevice outputPath) {
+        if (!outputsForDevice.containsKey(deviceId)) {
+            outputsForDevice.put(deviceId, new ArrayList<>());
+        }
+        outputsForDevice.get(deviceId).add(outputPath);
+    }
+
+    /**
+     * Returns all the possible group-based outputs for a given device.
+     *
+     * @param deviceId the device
+     * @return the list of Groups for this device.
+     */
+    public List<GroupsInDevice> getGroupOuputs(DeviceId deviceId) {
+        return outputsForDevice.get(deviceId);
+    }
+
+    /**
+     * Adds a complete possible path.
+     *
+     * @param completePath the path
+     */
+    public void addCompletePath(List<ConnectPoint> completePath) {
+        completePaths.add(completePath);
+    }
+
+    /**
+     * Return all the possible path the packet can take through the network.
+     *
+     * @return a list of paths
+     */
+    public List<List<ConnectPoint>> getCompletePaths() {
+        return completePaths;
+    }
+
+    /**
+     * Add the flows traversed by the packet in a given device.
+     *
+     * @param deviceId the device considered
+     * @param flows    the flows
+     */
+    public void addFlowsForDevice(DeviceId deviceId, List<FlowEntry> flows) {
+        flowsForDevice.put(deviceId, flows);
+    }
+
+    /**
+     * Returns the flows matched by this trace's packet for a given device.
+     *
+     * @param deviceId the device
+     * @return the flows matched
+     */
+    public List<FlowEntry> getFlowsForDevice(DeviceId deviceId) {
+        return flowsForDevice.get(deviceId);
+    }
+
+    @Override
+    public String toString() {
+        return "StaticPacketTrace{" +
+                "inPacket=" + inPacket +
+                ", in=" + in +
+                ", completePaths=" + completePaths +
+                ", outputsForDevice=" + outputsForDevice +
+                ", flowsForDevice=" + flowsForDevice +
+                ", resultMessage=" + resultMessage +
+                '}';
+    }
 }