metarepresenation.setAmModel(architectsModel);
metarepresenation.setDmModel(developersModel);
// precondition for membersAdded
interfacesModified = new ModelItemsModified();
membersAdded = new MembersAdded();
comparator = new Comparator();
comparator.add(interfacesModified);
comparator.add(membersAdded);