Every user will be able to rate the offers presented in our application. The combined rating from all offers of a user will be his/her rating, so other users will know if a he/she is a good/reliable one in order to trust him/her. The ratings will be out of 5. We can still make some simple categories to rate, like value for money or purchase happiness and then calculate the overall rating. This rating will show if an offer can be trusted or if is a good deal for other users. Furthermore with this rating system we will be able to rate each user who posts offers, making clear to other people who is a good/trusted user.