Bard and Wan, 2005 Bard J.F., Wan L., Weekly scheduling in the service industry: An application to mail processing and distribution centers, IIE Transactions 37 ( 5) ( 2005) 379– 396.Bard and Binici, 2003 Bard J.F., Binici C., Staff scheduling at the United States postal service, Computers & Operations Research 30 ( 5) ( 2003) 745– 771.Bard, 2004b Bard J.F., Staff scheduling in high volume service facilities with downgrading, IIE Transactions 36 ( 10) ( 2004) 985– 997.Bard, 2004a Bard J.F., Selecting the appropriate input data set when configuring a permanent workforce, Computers & Industrial Engineering 47 ( 4) ( 2004) 371– 389.Ağralı et al., 2017 Ağralı S., Taşkın Z.C., Ünal A.T., Employee scheduling in service industries with flexible employee availability and demand, Omega 66 ( 2017) 159– 169.It is also shown that the most attractive contracts are those that have short workdays. Regarding the staff composition, empirical results show that on average the proportion of full-time employees with respect to part-time employees is approximately 1:3. The increases in the number of multiskilled employees are mainly produced by demand variability than by their respective size. Results using real data from a Chilean retail firm show the potential benefits of the proposed hybrid flexibility strategy in relation to experiments where flexibility is not considered (i.e., without flexible contracts and multiskilling), or even, when scenarios consider only one of the two flexibility strategies. A mixed integer linear programming model is proposed to determine how many employees are required in each type of contract, and how many of them will be multiskilled employees and in which task types. The solution methodology develops, in an innovative way, a hybrid strategy of labor flexibility that combines the following two flexibility strategies: (i) flexible contracts, which allow to relax the duration of the shifts and the number of weekly hours employees must work and (ii) multiskilled staff, employees trained to work on multiple task types. This study evaluates the potential benefits of incorporating labor flexibility into personnel scheduling.