I wrote this website on the order of Diego, a Spanish and a doctoral student. For his thesis, he needed to have an online questionnaire and enter a number of users in that information and send an email to all users. After the user clicks on the link, they can enter their questionnaire and answer the questions.
After the user answered the questions, the results of the analysis were shown to them. In the management section also, Diego could extract the statistics and information he neede.