Optimization Programming Language (OPL) is a powerful, yet intuitive programming language that allows to solve Mixed Integer Linear Problems (MILP) via ILOG CPLEX - one of the most performing general-purpose MILP solvers available on the market. OPL allows to efficiently solve a wide variety of MILP involving thousands of variables and constraints within reasonable computing times. In this series of two seminars, we will show how some classical combinatorial optimization problems (e.g., Traveling Salesman Problem, Generalized Assignment Problem, etc) can be formulated and solved in OPL."