Despite this activity, crucial questions are often not investigated, perhaps because the problems have not been clearly identified or because the questions are difficult to study.
Ces Ã©crits nombreux n'empÃªchent pas que des questions critiques restent souvent inexplorÃ©es, peut-Ãªtre parce que les problÃ¨mes ne sont pas clairement dÃ©finis ou que les questions sont difficiles Ã Ã©tudier.