function NullInterface(cwsObj) {

  this.initialize = function() {
    return true;
  }

  this.setUserData = function(user) {
    return true;
  }

  this.saveUserData = function(user)  {
    return true;
  }

  this.clearData = function() {

  }

  this.savePerformanceData = function(user,commit) {
    //nothing - not supported in this interface
  }
  this.saveObjectiveData = function(index,objective,commit)  {
    //nothing - not supported in this interface
  }
  this.saveInteractionData = function(index,interaction,commit)  {
    //nothing - not supported in this interface
  }

  this.finished = function()  {
    //nothing
  }
}