diff --git a/routes/services/invisiblepuzzle/invisiblepuzzle.js b/routes/services/invisiblepuzzle/invisiblepuzzle.js
index af9d28f570b6b129e8017834d6b5b1409216b707..c9c0df4d23c50bdd4f161e25e13a97f0a1f6433c 100644
--- a/routes/services/invisiblepuzzle/invisiblepuzzle.js
+++ b/routes/services/invisiblepuzzle/invisiblepuzzle.js
@@ -1,3 +1,9 @@
+// PROTOCOL SPECIFICATION
+// -----------------------
+// /users/count - returns the number of users and how many of them are using VoiceOver
+// /users/vib - returns objects representing who are using VoiceOver
+// /users/sighted - returns objects representing who are not using VoiceOver
+
 var express = require('express');
 var router = express.Router();
 
@@ -8,7 +14,7 @@ var mongoClient = require('mongodb').MongoClient;
 var assert = assert = require('assert');
 
 // Connection URL
-var mongoUrl = 'mongodb://icarus:icarus@localhost:27017/icarus';
+var mongoUrl = 'mongodb://readOnly:readOnly@localhost:27017/icarus';
 
 //Connect to the server and intialise the pool
 var icarusDb;
@@ -28,11 +34,11 @@ router.get('/', function(req, res, next) {
 
 });
 
-router.get('/users', function(req, res, next) {
+router.get('/users/count', function(req, res, next) {
 
     var collection = icarusDb.collection('resources');
 
-    collection.aggregate(
+    var cursor = collection.aggregate(
 
         // Pipeline
         [
@@ -88,7 +94,31 @@ router.get('/users', function(req, res, next) {
             }
         ]
 
-    ).toArray(function(err, result) {
+    )
+
+    return_cursor(cursor, req, res, next);
+
+});
+
+router.get('/users/vib', function(req, res, next) {
+
+    var cursor = user_ids_cursor(true);
+
+    cursor.map( function(d) { return d['_id']; } );
+    return_cursor(cursor, req, res, next);
+
+});
+
+router.get('/users/sighted', function(req, res, next) {
+
+    var cursor = user_ids_cursor(false);
+    return_cursor(cursor, req, res, next);
+
+});
+
+function return_cursor(cursor, req, res, next){
+
+    cursor.toArray(function(err, result) {
 
         if(err!=null){
 
@@ -111,7 +141,182 @@ router.get('/users', function(req, res, next) {
 
     });
 
+}
+
+function user_ids_cursor(vib){
+
+    var filter_condition = {$eq: 0};
+
+    if(vib==true){
+
+        filter_condition  = {$gt: 0}
+
+    }
+
+    var collection = icarusDb.collection('resources');
+
+    return collection.aggregate(
+
+        // Pipeline
+        [
+            // Stage 1
+            {
+                $match: {
+                    "appdata.appname":"Invisible Puzzle",
+                    "debug":false
+                }
+            },
+
+            // Stage 2
+            {
+                $group: {
+                    "_id": "$appdata.uuid",
+                    "docs": {$sum: 1},
+                    "voiceover": {$sum : {$cond: [{$eq:["$appdata.voiceover", true]},1,0]}},
+                    "levels" : {
+                        "$addToSet" : "$userdata.level.id"
+                    },
+                    "sonifications" : {
+                        "$addToSet" : "$userdata.sonification"
+                    }
+                }
+
+            },
+
+            // Stage 3
+            {
+                $project: {
+
+                    "docs": 1,
+                    "vo_ratio": {$divide:["$voiceover","$docs"]},
+                    "levels": 1,
+                    "sonification": 1
+
+                }
+            },
+
+            // Stage 4
+            {
+                $match: {
+
+                    "vo_ratio": filter_condition
+
+                }
+            }
+
+        ]
+
+    )
+
+}
+
+/*router.get('/users/', function(req, res, next) {
+
+    var refresh = req.query.refresh;
+
+    if(refresh==1){
+
+        rebuild_user_stats(req, res, next);
+
+    }else{
+
+        res.sendStatus(500);
+
+    }
+
+
 
 });
 
+function rebuild_user_stats(req, res, next){
+
+    var collection = icarusDb.collection('resources');
+    collection.aggregate(
+
+        // Pipeline
+        [
+            // Stage 1
+            {
+                $match: {
+                    "appdata.appname" : "Invisible Puzzle",
+                    "debug" : false
+                }
+            },
+
+            // Stage 2
+            {
+                $group: {
+                    "_id" : "$appdata.uuid",
+                    "docs" : {
+                        "$sum" : 1
+                    },
+                    "voiceover" : {
+                        "$sum" : {
+                            "$cond" : [
+                                {
+                                    "$eq" : [
+                                        "$appdata.voiceover",
+                                        true
+                                    ]
+                                },
+                                1,
+                                0
+                            ]
+                        }
+                    },
+                    "levels" : {
+                        "$addToSet" : "$userdata.level.id"
+                    },
+                    "sonifications" : {
+                        "$addToSet" : "$userdata.sonification"
+                    }
+                }
+            },
+
+            // Stage 3
+            {
+                $project: {
+                    "docs" : 1,
+                    "vo_ratio" : {
+                        "$divide" : [
+                            "$voiceover",
+                            "$docs"
+                        ]
+                    },
+                    "levels" : 1,
+                    "sonifications" : 1
+                }
+            },
+
+            // Stage 4
+            {
+                $out: "ip_user_stats"
+            }
+        ]
+
+    ).toArray(function(err, result) {
+
+        if(err!=null){
+
+            debug(err);
+            next(err);
+
+        }else{
+
+            if(result==undefined){
+
+                res.sendStatus(404);
+
+            }else{
+
+                res.sendStatus(201, result);
+
+            }
+
+        }
+
+    });
+
+}*/
+
 module.exports = router;