Before revision: Moreover, the quality of the obtained preferences might not be ideal as the user could rate items he/she has seen months or years ago or the provided ratings could be almost random if the user provided them without paying attention just to complete the registration quickly.
After revision: Moreover, the quality of the obtained preferences might not be ideal as the user could rate items they had seen months or years ago or the provided ratings could be almost random if the user provided them without paying attention just to complete the registration quickly.