diff --git a/lib/jools.js b/lib/jools.js
index 98582e4..7eb56dc 100644
--- a/lib/jools.js
+++ b/lib/jools.js
@@ -28,10 +28,9 @@ function Jools(rules) {
  *
  * @param {Object} fact
  */
-Jools.prototype.execute = function (fact) {
-  var self = this
-    , session = _.clone(fact)
-    , last_session = _.clone(fact)
+Jools.prototype.execute = function (session) {
+  
+  var last_session = _.clone(session)
     , goal = false;
 
   while (!goal) {
@@ -52,7 +51,7 @@ Jools.prototype.execute = function (fact) {
       if (outcome) {
         _.flatten([rule.consequence]).forEach(function (csq) {
           csq.__args = csq.__args || utils.paramNames(csq); 
-          csq.apply(session, utils.paramsToArguments(fact, csq.__args));
+          csq.apply(session, utils.paramsToArguments(session, csq.__args));
           if (!_.isEqual(last_session,session)) {
             // Fire all rules again!
             changes = true;