diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/DefaultNextGroup.java b/core/api/src/main/java/org/onosproject/net/behaviour/DefaultNextGroup.java
new file mode 100644
index 0000000..ef1f9de
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/behaviour/DefaultNextGroup.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.net.behaviour;
+
+/**
+ * Default implementation of a next group.
+ */
+public class DefaultNextGroup implements NextGroup {
+
+    private final byte[] data;
+
+    public DefaultNextGroup(byte[] data) {
+        this.data = data;
+    }
+
+    @Override
+    public byte[] data() {
+        return data;
+    }
+}
diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/NextGroup.java b/core/api/src/main/java/org/onosproject/net/behaviour/NextGroup.java
new file mode 100644
index 0000000..b5a3891
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/behaviour/NextGroup.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.net.behaviour;
+
+/**
+ * Opaque data type for carrying group-like information.
+ * Only relevant to a pipeliner driver.
+ */
+public interface NextGroup {
+
+    /**
+     * Serialized form of the next group.
+     * @return a byte array.
+     */
+    byte[] data();
+
+}
diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/Pipeliner.java b/core/api/src/main/java/org/onosproject/net/behaviour/Pipeliner.java
index eda131a..dcfc588 100644
--- a/core/api/src/main/java/org/onosproject/net/behaviour/Pipeliner.java
+++ b/core/api/src/main/java/org/onosproject/net/behaviour/Pipeliner.java
@@ -21,9 +21,6 @@
 import org.onosproject.net.flowobjective.ForwardingObjective;
 import org.onosproject.net.flowobjective.NextObjective;
 
-import java.util.Collection;
-import java.util.concurrent.Future;
-
 /**
  * Behaviour for handling various pipelines.
  */
@@ -40,24 +37,21 @@
     /**
      * Installs the filtering rules onto the device.
      *
-     * @param filterObjectives the collection of filters
-     * @return a future indicating the success of the operation
+     * @param filterObjective a filtering objective
      */
-    Future<Boolean> filter(Collection<FilteringObjective> filterObjectives);
+    void filter(FilteringObjective filterObjective);
 
     /**
      * Installs the forwarding rules onto the device.
      *
-     * @param forwardObjectives the collection of forwarding objectives
-     * @return a future indicating the success of the operation
+     * @param forwardObjective a forwarding objective
      */
-    Future<Boolean> forward(Collection<ForwardingObjective> forwardObjectives);
+    void forward(ForwardingObjective forwardObjective);
 
     /**
      * Installs the next hop elements into the device.
      *
-     * @param nextObjectives the collection of next objectives
-     * @return a future indicating the success of the operation
+     * @param nextObjective a next objectives
      */
-    Future<Boolean> next(Collection<NextObjective> nextObjectives);
+    void next(NextObjective nextObjective);
 }
diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/PipelinerContext.java b/core/api/src/main/java/org/onosproject/net/behaviour/PipelinerContext.java
index c2c6dfd..d0ca42b 100644
--- a/core/api/src/main/java/org/onosproject/net/behaviour/PipelinerContext.java
+++ b/core/api/src/main/java/org/onosproject/net/behaviour/PipelinerContext.java
@@ -16,6 +16,7 @@
 package org.onosproject.net.behaviour;
 
 import org.onlab.osgi.ServiceDirectory;
+import org.onosproject.net.flowobjective.FlowObjectiveStore;
 
 /**
  * Processing context and supporting services for the pipeline behaviour.
@@ -30,5 +31,11 @@
      */
     ServiceDirectory directory();
 
+    /**
+     * Returns the Objective Store where data can be stored and retrieved.
+     * @return the flow objective store
+     */
+    FlowObjectiveStore store();
+
     // TODO: add means to store and access shared state
 }
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultFilteringObjective.java b/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultFilteringObjective.java
index 33b8f5a..94519a9 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultFilteringObjective.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultFilteringObjective.java
@@ -23,6 +23,7 @@
 import java.util.Collection;
 import java.util.List;
 import java.util.Objects;
+import java.util.Optional;
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
@@ -42,6 +43,7 @@
     private final List<Criterion> conditions;
     private final int id;
     private final Operation op;
+    private final Optional<ObjectiveContext> context;
 
     private DefaultFilteringObjective(Type type, boolean permanent, int timeout,
                                       ApplicationId appId, int priority, Criterion key,
@@ -54,6 +56,25 @@
         this.priority = priority;
         this.conditions = conditions;
         this.op = op;
+        this.context = Optional.empty();
+
+        this.id = Objects.hash(type, key, conditions, permanent,
+                               timeout, appId, priority);
+    }
+
+    public DefaultFilteringObjective(Type type, boolean permanent, int timeout,
+                                     ApplicationId appId, int priority, Criterion key,
+                                     List<Criterion> conditions,
+                                     ObjectiveContext context, Operation op) {
+        this.key = key;
+        this.type = type;
+        this.permanent = permanent;
+        this.timeout = timeout;
+        this.appId = appId;
+        this.priority = priority;
+        this.conditions = conditions;
+        this.op = op;
+        this.context = Optional.ofNullable(context);
 
         this.id = Objects.hash(type, key, conditions, permanent,
                                timeout, appId, priority);
@@ -104,6 +125,11 @@
         return op;
     }
 
+    @Override
+    public Optional<ObjectiveContext> context() {
+        return context;
+    }
+
     /**
      * Returns a new builder.
      *
@@ -201,6 +227,31 @@
 
         }
 
+        @Override
+        public FilteringObjective add(ObjectiveContext context) {
+            List<Criterion> conditions = listBuilder.build();
+            checkNotNull(type, "Must have a type.");
+            checkArgument(!conditions.isEmpty(), "Must have at least one condition.");
+            checkNotNull(appId, "Must supply an application id");
+
+            return new DefaultFilteringObjective(type, permanent, timeout,
+                                                 appId, priority, key, conditions,
+                                                 context, Operation.ADD);
+        }
+
+        @Override
+        public FilteringObjective remove(ObjectiveContext context) {
+            List<Criterion> conditions = listBuilder.build();
+            checkNotNull(type, "Must have a type.");
+            checkArgument(!conditions.isEmpty(), "Must have at least one condition.");
+            checkNotNull(appId, "Must supply an application id");
+
+
+            return new DefaultFilteringObjective(type, permanent, timeout,
+                                                 appId, priority, key, conditions,
+                                                 context, Operation.REMOVE);
+        }
+
 
     }
 
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultForwardingObjective.java b/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultForwardingObjective.java
index d110e07..6489bea 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultForwardingObjective.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultForwardingObjective.java
@@ -20,6 +20,7 @@
 import org.onosproject.net.flow.TrafficTreatment;
 
 import java.util.Objects;
+import java.util.Optional;
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
@@ -38,6 +39,7 @@
     private final int nextId;
     private final TrafficTreatment treatment;
     private final Operation op;
+    private final Optional<ObjectiveContext> context;
 
     private final int id;
 
@@ -55,6 +57,29 @@
         this.nextId = nextId;
         this.treatment = treatment;
         this.op = op;
+        this.context = Optional.empty();
+
+        this.id = Objects.hash(selector, flag, permanent,
+                               timeout, appId, priority, nextId,
+                               treatment, op);
+    }
+
+    private DefaultForwardingObjective(TrafficSelector selector,
+                                       Flag flag, boolean permanent,
+                                       int timeout, ApplicationId appId,
+                                       int priority, int nextId,
+                                       TrafficTreatment treatment,
+                                       ObjectiveContext context, Operation op) {
+        this.selector = selector;
+        this.flag = flag;
+        this.permanent = permanent;
+        this.timeout = timeout;
+        this.appId = appId;
+        this.priority = priority;
+        this.nextId = nextId;
+        this.treatment = treatment;
+        this.op = op;
+        this.context = Optional.ofNullable(context);
 
         this.id = Objects.hash(selector, flag, permanent,
                                timeout, appId, priority, nextId,
@@ -113,6 +138,11 @@
         return op;
     }
 
+    @Override
+    public Optional<ObjectiveContext> context() {
+        return context;
+    }
+
     /**
      * Returns a new builder.
      *
@@ -186,7 +216,7 @@
         public ForwardingObjective add() {
             checkNotNull(selector, "Must have a selector");
             checkNotNull(flag, "A flag must be set");
-            checkArgument(nextId != null && treatment != null, "Must supply at " +
+            checkArgument(nextId != null || treatment != null, "Must supply at " +
                     "least a treatment and/or a nextId");
             checkNotNull(appId, "Must supply an application id");
             return new DefaultForwardingObjective(selector, flag, permanent,
@@ -198,12 +228,38 @@
         public ForwardingObjective remove() {
             checkNotNull(selector, "Must have a selector");
             checkNotNull(flag, "A flag must be set");
-            checkArgument(nextId != null && treatment != null, "Must supply at " +
+            checkArgument(nextId != null || treatment != null, "Must supply at " +
                     "least a treatment and/or a nextId");
             checkNotNull(appId, "Must supply an application id");
             return new DefaultForwardingObjective(selector, flag, permanent,
                                                    timeout, appId, priority,
                                                    nextId, treatment, Operation.REMOVE);
         }
+
+        @Override
+        public ForwardingObjective add(ObjectiveContext context) {
+            checkNotNull(selector, "Must have a selector");
+            checkNotNull(flag, "A flag must be set");
+            checkArgument(nextId != null || treatment != null, "Must supply at " +
+                    "least a treatment and/or a nextId");
+            checkNotNull(appId, "Must supply an application id");
+            return new DefaultForwardingObjective(selector, flag, permanent,
+                                                  timeout, appId, priority,
+                                                  nextId, treatment,
+                                                  context, Operation.ADD);
+        }
+
+        @Override
+        public ForwardingObjective remove(ObjectiveContext context) {
+            checkNotNull(selector, "Must have a selector");
+            checkNotNull(flag, "A flag must be set");
+            checkArgument(nextId != null || treatment != null, "Must supply at " +
+                    "least a treatment and/or a nextId");
+            checkNotNull(appId, "Must supply an application id");
+            return new DefaultForwardingObjective(selector, flag, permanent,
+                                                  timeout, appId, priority,
+                                                  nextId, treatment,
+                                                  context, Operation.REMOVE);
+        }
     }
 }
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultNextObjective.java b/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultNextObjective.java
index 4ab79ff..cc316fe 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultNextObjective.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/DefaultNextObjective.java
@@ -21,6 +21,7 @@
 
 import java.util.Collection;
 import java.util.List;
+import java.util.Optional;
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkNotNull;
@@ -34,13 +35,28 @@
     private final ApplicationId appId;
     private final Type type;
     private final Integer id;
+    private final Operation op;
+    private final Optional<ObjectiveContext> context;
 
     private DefaultNextObjective(Integer id, List<TrafficTreatment> treatments,
-                                ApplicationId appId, Type type) {
+                                ApplicationId appId, Type type, Operation op) {
         this.treatments = treatments;
         this.appId = appId;
         this.type = type;
         this.id = id;
+        this.op = op;
+        this.context = Optional.empty();
+    }
+
+    private DefaultNextObjective(Integer id, List<TrafficTreatment> treatments,
+                                 ApplicationId appId, ObjectiveContext context,
+                                 Type type, Operation op) {
+        this.treatments = treatments;
+        this.appId = appId;
+        this.type = type;
+        this.id = id;
+        this.op = op;
+        this.context = Optional.ofNullable(context);
     }
 
     @Override
@@ -80,7 +96,12 @@
 
     @Override
     public Operation op() {
-        throw new UnsupportedOperationException("Next Objective has no operation");
+        return op;
+    }
+
+    @Override
+    public Optional<ObjectiveContext> context() {
+        return context;
     }
 
     /**
@@ -101,8 +122,6 @@
         private final ImmutableList.Builder<TrafficTreatment> listBuilder
                 = ImmutableList.builder();
 
-
-
         @Override
         public NextObjective.Builder withId(int nextId) {
             this.id = nextId;
@@ -143,7 +162,7 @@
         }
 
         @Override
-        public Builder fromApp(ApplicationId appId) {
+        public NextObjective.Builder fromApp(ApplicationId appId) {
             this.appId = appId;
             return this;
         }
@@ -160,14 +179,49 @@
         }
 
         @Override
-        public NextObjective build() {
+        public NextObjective add() {
             List<TrafficTreatment> treatments = listBuilder.build();
             checkNotNull(appId, "Must supply an application id");
             checkNotNull(id, "id cannot be null");
             checkNotNull(type, "The type cannot be null");
             checkArgument(!treatments.isEmpty(), "Must have at least one treatment");
 
-            return new DefaultNextObjective(id, treatments, appId, type);
+            return new DefaultNextObjective(id, treatments, appId, type, Operation.ADD);
+        }
+
+        @Override
+        public NextObjective remove() {
+            List<TrafficTreatment> treatments = listBuilder.build();
+            checkNotNull(appId, "Must supply an application id");
+            checkNotNull(id, "id cannot be null");
+            checkNotNull(type, "The type cannot be null");
+            checkArgument(!treatments.isEmpty(), "Must have at least one treatment");
+
+            return new DefaultNextObjective(id, treatments, appId, type, Operation.REMOVE);
+        }
+
+        @Override
+        public NextObjective add(ObjectiveContext context) {
+            List<TrafficTreatment> treatments = listBuilder.build();
+            checkNotNull(appId, "Must supply an application id");
+            checkNotNull(id, "id cannot be null");
+            checkNotNull(type, "The type cannot be null");
+            checkArgument(!treatments.isEmpty(), "Must have at least one treatment");
+
+            return new DefaultNextObjective(id, treatments, appId,
+                                            context, type, Operation.ADD);
+        }
+
+        @Override
+        public NextObjective remove(ObjectiveContext context) {
+            List<TrafficTreatment> treatments = listBuilder.build();
+            checkNotNull(appId, "Must supply an application id");
+            checkNotNull(id, "id cannot be null");
+            checkNotNull(type, "The type cannot be null");
+            checkArgument(!treatments.isEmpty(), "Must have at least one treatment");
+
+            return new DefaultNextObjective(id, treatments, appId,
+                                            context, type, Operation.REMOVE);
         }
     }
 }
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java b/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java
index d892a97..89b668d 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/FilteringObjective.java
@@ -114,6 +114,24 @@
          */
         public FilteringObjective remove();
 
+        /**
+         * Builds the filtering objective that will be added.
+         * The context will be used to notify the calling application.
+         *
+         * @param context an objective context
+         * @return a filtering objective
+         */
+        public FilteringObjective add(ObjectiveContext context);
+
+        /**
+         * Builds the filtering objective that will be removed.
+         * The context will be used to notify the calling application.
+         *
+         * @param context an objective context
+         * @return a filtering objective
+         */
+        public FilteringObjective remove(ObjectiveContext context);
+
 
     }
 
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/FlowObjectiveService.java b/core/api/src/main/java/org/onosproject/net/flowobjective/FlowObjectiveService.java
index 14af2b8..690fcc7 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/FlowObjectiveService.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/FlowObjectiveService.java
@@ -17,9 +17,6 @@
 
 import org.onosproject.net.DeviceId;
 
-import java.util.Collection;
-import java.util.concurrent.Future;
-
 /**
  * Service for programming data plane flow rules in manner independent of
  * specific device table pipeline configuration.
@@ -30,27 +27,24 @@
      * Installs the filtering rules onto the specified device.
      *
      * @param deviceId            device identifier
-     * @param filteringObjectives the collection of filters
-     * @return a future indicating the success of the operation
+     * @param filteringObjective the filtering objective
      */
-    Future<Boolean> filter(DeviceId deviceId, Collection<FilteringObjective> filteringObjectives);
+    void filter(DeviceId deviceId, FilteringObjective filteringObjective);
 
     /**
      * Installs the forwarding rules onto the specified device.
      *
      * @param deviceId             device identifier
-     * @param forwardingObjectives the collection of forwarding objectives
-     * @return a future indicating the success of the operation
+     * @param forwardingObjective the forwarding objective
      */
-    Future<Boolean> forward(DeviceId deviceId, Collection<ForwardingObjective> forwardingObjectives);
+    void forward(DeviceId deviceId, ForwardingObjective forwardingObjective);
 
     /**
      * Installs the next hop elements into the specified device.
      *
      * @param deviceId       device identifier
-     * @param nextObjectives the collection of next objectives
-     * @return a future indicating the success of the operation
+     * @param nextObjective a next objective
      */
-    Future<Boolean> next(DeviceId deviceId, Collection<NextObjective> nextObjectives);
+    void next(DeviceId deviceId, NextObjective nextObjective);
 
 }
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/FlowObjectiveStore.java b/core/api/src/main/java/org/onosproject/net/flowobjective/FlowObjectiveStore.java
new file mode 100644
index 0000000..e667618
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/FlowObjectiveStore.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.net.flowobjective;
+
+import org.onosproject.net.behaviour.NextGroup;
+import org.onosproject.store.Store;
+
+/**
+ * The flow objective store.
+ */
+public interface FlowObjectiveStore
+        extends Store<ObjectiveEvent, FlowObjectiveStoreDelegate> {
+
+    /**
+     * Adds a NextGroup to the store.
+     *
+     * @param nextId an integer
+     * @param group a next group opaque object
+     */
+    void putNextGroup(Integer nextId, NextGroup group);
+
+    /**
+     * Fetch a next group from the store.
+     * @param nextId an integer
+     * @return a next group
+     */
+    NextGroup getNextGroup(Integer nextId);
+}
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/FlowObjectiveStoreDelegate.java b/core/api/src/main/java/org/onosproject/net/flowobjective/FlowObjectiveStoreDelegate.java
new file mode 100644
index 0000000..5af7836
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/FlowObjectiveStoreDelegate.java
@@ -0,0 +1,24 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.net.flowobjective;
+
+import org.onosproject.store.StoreDelegate;
+
+/**
+ * Flow Objective store delegate abstraction.
+ */
+public interface FlowObjectiveStoreDelegate extends StoreDelegate<ObjectiveEvent> {
+}
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/ForwardingObjective.java b/core/api/src/main/java/org/onosproject/net/flowobjective/ForwardingObjective.java
index 4fecc54..dcc377f 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/ForwardingObjective.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/ForwardingObjective.java
@@ -121,5 +121,23 @@
          * @return a forwarding objective.
          */
         public ForwardingObjective remove();
+
+        /**
+         * Builds the forwarding objective that will be added.
+         * The context will be used to notify the calling application.
+         *
+         * @param context an objective context
+         * @return a forwarding objective
+         */
+        public ForwardingObjective add(ObjectiveContext context);
+
+        /**
+         * Builds the forwarding objective that will be removed.
+         * The context will be used to notify the calling application.
+         *
+         * @param context an objective context
+         * @return a forwarding objective
+         */
+        public ForwardingObjective remove(ObjectiveContext context);
     }
 }
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/NextObjective.java b/core/api/src/main/java/org/onosproject/net/flowobjective/NextObjective.java
index 52e79ee..02c4d9e 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/NextObjective.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/NextObjective.java
@@ -15,6 +15,7 @@
  */
 package org.onosproject.net.flowobjective;
 
+import org.onosproject.core.ApplicationId;
 import org.onosproject.net.flow.TrafficTreatment;
 
 import java.util.Collection;
@@ -95,12 +96,40 @@
          */
         public Builder addTreatment(TrafficTreatment treatment);
 
+        @Override
+        public Builder fromApp(ApplicationId appId);
+
         /**
-         * Builds a next step.
+         * Builds the next objective that will be added.
          *
-         * @return a next step
+         * @return a next objective
          */
-        public NextObjective build();
+        public NextObjective add();
+
+        /**
+         * Builds the next objective that will be removed.
+         *
+         * @return a next objective.
+         */
+        public NextObjective remove();
+
+        /**
+         * Builds the next objective that will be added.
+         * The context will be used to notify the calling application.
+         *
+         * @param context an objective context
+         * @return a next objective
+         */
+        public NextObjective add(ObjectiveContext context);
+
+        /**
+         * Builds the next objective that will be removed.
+         * The context will be used to notify the calling application.
+         *
+         * @param context an objective context
+         * @return a next objective
+         */
+        public NextObjective remove(ObjectiveContext context);
 
     }
 
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/Objective.java b/core/api/src/main/java/org/onosproject/net/flowobjective/Objective.java
index 3971b03..fa98b6d 100644
--- a/core/api/src/main/java/org/onosproject/net/flowobjective/Objective.java
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/Objective.java
@@ -17,6 +17,8 @@
 
 import org.onosproject.core.ApplicationId;
 
+import java.util.Optional;
+
 /**
  * Base representation of an flow description.
  */
@@ -84,6 +86,14 @@
     Operation op();
 
     /**
+     * Obtains an optional context.
+     *
+     * @return optional; which will be empty if there is no context.
+     * Otherwise it will return the context.
+     */
+    Optional<ObjectiveContext> context();
+
+    /**
      * An objective builder.
      */
     public interface Builder {
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveContext.java b/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveContext.java
new file mode 100644
index 0000000..00e4ed8
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveContext.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.net.flowobjective;
+
+/**
+ * The context of a objective that will become the subject of
+ * the notification.
+ *
+ * Implementations of this class must be serializable.
+ */
+public interface ObjectiveContext {
+
+    default void onSuccess(Objective objective) {}
+
+    default void onError(Objective objective, ObjectiveError error) {}
+
+}
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveError.java b/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveError.java
new file mode 100644
index 0000000..6e60ab6
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveError.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.net.flowobjective;
+
+/**
+ * Represents the set of errors possible when processing an objective.
+ */
+public enum ObjectiveError {
+
+    /**
+     * The driver processing this objective does not know how to process it.
+     */
+    UNSUPPORTED,
+
+    /**
+     * The flow installation for this objective failed.
+     */
+    FLOWINSTALLATIONFAILED,
+
+    /**
+     * THe group installation for this objective failed.
+     */
+    GROUPINSTALLATIONFAILED,
+
+    /**
+     * The group was reported as installed but is not missing.
+     */
+    GROUPMISSING,
+
+    /**
+     * An unknown error occurred.
+     */
+    UNKNOWN
+}
diff --git a/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveEvent.java b/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveEvent.java
new file mode 100644
index 0000000..9f095cf
--- /dev/null
+++ b/core/api/src/main/java/org/onosproject/net/flowobjective/ObjectiveEvent.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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.net.flowobjective;
+
+import org.onosproject.event.AbstractEvent;
+
+/**
+ * Describes a objective event.
+ */
+public class ObjectiveEvent extends AbstractEvent<ObjectiveEvent.Type, Integer> {
+
+    /**
+     * Type of objective events.
+     */
+    public enum Type {
+        /**
+         * Signifies that the objective has been added to the store.
+         */
+        ADD,
+
+        /**
+         * Signifies that the objective has been removed.
+         */
+        REMOVE
+    }
+
+    /**
+     * Creates an event of the given type for the specified objective id.
+     *
+     * @param type the type of the event
+     * @param objective the objective id the event is about
+     */
+    public ObjectiveEvent(Type type, Integer objective) {
+        super(type, objective);
+    }
+
+    /**
+     * Creates an event of the given type for the specified objective id at the given
+     * time.
+     *
+     * @param type the type of the event
+     * @param objective the objective id the event is about
+     * @param time the time of the event
+     */
+    public ObjectiveEvent(Type type, Integer objective, long time) {
+        super(type, objective, time);
+    }
+}
+