public void removeQuestion(Question aQuestion) {
   questionRepository.remove(aQuestion);
 }
 public void insertQuestion(Question aQuestion) {
   questionRepository.insert(aQuestion);
 }
 public void updateQuestion(Question aQuestion) {
   questionRepository.update(aQuestion);
 }
 public List<Question> findQuestions(String aFieldName, Object aFieldValue) {
   return questionRepository.find(aFieldName, aFieldValue);
 }