Due to time and/or budget restrictions , visiting all these attractions is usually infeasible. Hence, a selection of the most important POIs to visit, without violating user restrictions, is in need. A significant body of mobile RS prototypes addresses this requirement through generating multiple-day personalized tours via a subset of available POIs (each tour corresponds to each day of stay ); In addition to user defined restrictions and preferences, several constraints may be considered, such as the opening hours of POIs, the number and duration of desirable breaks (e.g. for lunch or rest),etc. In the relevant literature, this problem is known as the tourist trip design problem(TTDP).