Production planning aims to organize the production activity, making it consistent with the business plans which define the economic and financial objectives of the entire company. In manufacturing companies, it concerns with defining the production plans or programs and establishes what, how much and when to produce, with different levels of detail and different time horizons. Among the planning activities, scheduling is responsible for organizing production in the short term, the work shift or the day. It is decision-making process allowing to create and assign a sequence of activities to each resource (equipment, machines, operators). Technological development has enabled the birth of new tools useful for managing the production process.