metarepresenation = MetaRepresentation.getInstance();
metarepresenation.setAmModel(architectsModel);
metarepresenation.setDmModel(developersModel);
// precondition for membersModified
interfacesModified = new ModelItemsModified();
membersModified = new MembersModified();
comparator = new Comparator();
comparator.add(interfacesModified);
comparator.add(membersModified);