diff --git a/context.go b/context.go
index 59e409b..b4320d0 100644
--- a/context.go
+++ b/context.go
@@ -1294,6 +1294,16 @@ func NewContext(db * badger.DB, log Logger) (*Context, error) {
     return nil, err
   }
 
+  err = ctx.RegisterSignal(reflect.TypeOf(RemoveMemberSignal{}), RemoveMemberSignalType)
+  if err != nil {
+    return nil, err
+  }
+
+  err = ctx.RegisterSignal(reflect.TypeOf(AddMemberSignal{}), AddMemberSignalType)
+  if err != nil {
+    return nil, err
+  }
+
   err = ctx.RegisterSignal(reflect.TypeOf(StopSignal{}), StopSignalType)
   if err != nil {
     return nil, err
diff --git a/gql.go b/gql.go
index 46387d4..45a4f0d 100644
--- a/gql.go
+++ b/gql.go
@@ -517,9 +517,7 @@ func GQLHandler(ctx *Context, server *Node, gql_ext *GQLExt) func(http.ResponseW
       params.VariableValues = query.Variables
     }
 
-    ctx.Log.Logf("gql", "PARAMS: %+v", params)
     result := graphql.Do(params)
-    ctx.Log.Logf("gql", "RESULT: %+v", result)
     if len(result.Errors) > 0 {
       extra_fields := map[string]interface{}{}
       extra_fields["body"] = string(str)
diff --git a/group.go b/group.go
index e958158..3dfa572 100644
--- a/group.go
+++ b/group.go
@@ -1,8 +1,45 @@
 package graphvent
 
 import (
+  "slices"
 )
 
+type AddMemberSignal struct {
+  SignalHeader
+  MemberID NodeID `gv:"member_id"`
+}
+
+func (signal AddMemberSignal) Permission() Tree {
+  return Tree{
+    SerializedType(AddMemberSignalType): nil,
+  }
+}
+
+func NewAddMemberSignal(member_id NodeID) *AddMemberSignal {
+  return &AddMemberSignal{
+    NewSignalHeader(Direct),
+    member_id,
+  }
+}
+
+type RemoveMemberSignal struct {
+  SignalHeader
+  MemberID NodeID `gv:"member_id"`
+}
+
+func (signal RemoveMemberSignal) Permission() Tree {
+  return Tree{
+    SerializedType(RemoveMemberSignalType): nil,
+  }
+}
+
+func NewRemoveMemberSignal(member_id NodeID) *RemoveMemberSignal {
+  return &RemoveMemberSignal{
+    NewSignalHeader(Direct),
+    member_id,
+  }
+}
+
 var GroupReadPolicy = NewAllNodesPolicy(Tree{
   SerializedType(ReadSignalType): {
     SerializedType(GroupExtType): {
@@ -22,6 +59,29 @@ func NewGroupExt(members []NodeID) *GroupExt {
 }
 
 func (ext *GroupExt) Process(ctx *Context, node *Node, source NodeID, signal Signal) (Messages, Changes) {
-  return nil, nil
+  var messages Messages = nil
+  var changes Changes = nil
+
+  switch sig := signal.(type) {
+  case *AddMemberSignal:
+    if slices.Contains(ext.Members, sig.MemberID) == true {
+      messages = messages.Add(ctx, node.ID, node.Key, NewErrorSignal(sig.Id, "already_member"), source)
+    } else {
+      ext.Members = append(ext.Members, sig.MemberID)
+      messages = messages.Add(ctx, node.ID, node.Key, NewSuccessSignal(sig.Id), source)
+      changes = changes.Add("member_added")
+    }
+  case *RemoveMemberSignal:
+    idx := slices.Index(ext.Members, sig.MemberID)
+    if idx == -1 {
+      messages = messages.Add(ctx, node.ID, node.Key, NewErrorSignal(sig.Id, "not_member"), source)
+    } else {
+      ext.Members = slices.Delete(ext.Members, idx, idx+1)
+      messages = messages.Add(ctx, node.ID, node.Key, NewSuccessSignal(sig.Id), source)
+      changes = changes.Add("member_removed")
+    }
+  }
+
+  return messages, changes
 }
 
diff --git a/group_test.go b/group_test.go
new file mode 100644
index 0000000..9b7b623
--- /dev/null
+++ b/group_test.go
@@ -0,0 +1,61 @@
+package graphvent
+
+import (
+  "testing"
+  "time"
+)
+
+func TestGroupAdd(t *testing.T) {
+  ctx := logTestContext(t, []string{"listener", "test"})
+
+  group_listener := NewListenerExt(10)
+  group, err := NewNode(ctx, nil, GroupNodeType, 10, nil, group_listener, NewGroupExt(nil))
+  fatalErr(t, err)
+
+  user_id := RandID()
+  add_member_signal := NewAddMemberSignal(user_id)
+
+  messages := Messages{}
+  messages = messages.Add(ctx, group.ID, group.Key, add_member_signal, group.ID)
+  fatalErr(t, ctx.Send(messages))
+
+  _, err = WaitForResponse(group_listener.Chan, 10*time.Millisecond, add_member_signal.Id)
+  fatalErr(t, err)
+
+  read_signal := NewReadSignal(map[ExtType][]string{
+    GroupExtType: {"members"},
+  })
+
+  messages = Messages{}
+  messages = messages.Add(ctx, group.ID, group.Key, read_signal, group.ID)
+  fatalErr(t, ctx.Send(messages))
+
+  response, err := WaitForResponse(group_listener.Chan, 10*time.Millisecond, read_signal.Id)
+  fatalErr(t, err)
+
+  read_response := response.(*ReadResultSignal)
+
+  members_serialized := read_response.Extensions[GroupExtType]["members"]
+
+  _, member_value, remaining, err := DeserializeValue(ctx, members_serialized)
+
+  if len(remaining.Data) > 0 {
+    t.Fatalf("Data remaining after deserializing member list: %d", len(remaining.Data))
+  }
+
+  member_list, ok := member_value.Interface().([]NodeID)
+  
+  if ok != true {
+    t.Fatalf("member_list wrong type %s", member_value.Type())
+  }
+
+  if len(member_list) != 1 {
+    t.Fatalf("member_list wrong length %d", len(member_list))
+  }
+
+  if member_list[0] != user_id {
+    t.Fatalf("member_list wrong value %s", member_list[0])
+  }
+
+  ctx.Log.Logf("test", "Read Response: %+v", read_response)
+}
diff --git a/serialize.go b/serialize.go
index b2de952..9c17076 100644
--- a/serialize.go
+++ b/serialize.go
@@ -84,22 +84,24 @@ var (
   GQLExtType      = NewExtType("GQL")
   GroupExtType    = NewExtType("GROUP")
 
-  GQLNodeType = NewNodeType("GQL")
-  BaseNodeType = NewNodeType("BASE")
+  GQLNodeType   = NewNodeType("GQL")
+  BaseNodeType  = NewNodeType("BASE")
   GroupNodeType = NewNodeType("GROUP")
 
-  StopSignalType       = NewSignalType("STOP")
-  CreateSignalType     = NewSignalType("CREATE")
-  StartSignalType      = NewSignalType("START")
-  StatusSignalType     = NewSignalType("STATUS")
-  LinkSignalType       = NewSignalType("LINK")
-  LockSignalType       = NewSignalType("LOCK")
-  TimeoutSignalType    = NewSignalType("TIMEOUT")
-  ReadSignalType       = NewSignalType("READ")
-  ACLTimeoutSignalType = NewSignalType("ACL_TIMEOUT")
-  ErrorSignalType      = NewSignalType("ERROR")
-  SuccessSignalType    = NewSignalType("SUCCESS")
-  ReadResultSignalType = NewSignalType("READ_RESULT")
+  StopSignalType         = NewSignalType("STOP")
+  CreateSignalType       = NewSignalType("CREATE")
+  StartSignalType        = NewSignalType("START")
+  StatusSignalType       = NewSignalType("STATUS")
+  LinkSignalType         = NewSignalType("LINK")
+  LockSignalType         = NewSignalType("LOCK")
+  TimeoutSignalType      = NewSignalType("TIMEOUT")
+  ReadSignalType         = NewSignalType("READ")
+  ACLTimeoutSignalType   = NewSignalType("ACL_TIMEOUT")
+  ErrorSignalType        = NewSignalType("ERROR")
+  SuccessSignalType      = NewSignalType("SUCCESS")
+  ReadResultSignalType   = NewSignalType("READ_RESULT")
+  RemoveMemberSignalType = NewSignalType("REMOVE_MEMBER")
+  AddMemberSignalType    = NewSignalType("ADD_MEMBER")
 
   MemberOfPolicyType      = NewPolicyType("USER_OF")
   RequirementOfPolicyType = NewPolicyType("REQUIEMENT_OF")