The issue of the workforce management in the field is crucial for infrastructure operators. A key role is played by workforce management systems that assign workers with the right skills at the optimal time in the right place, so long-term compliance with the required quality parameters is met at the lowest possible costs. Historical development and theoretical basics of workforce management systems are presented in the paper. Fundamental of paper is the issue of modelling and simulation of Workforce management systems. The output is simulation model. Results of simulations and their compliance with the real data are discussed in conclusion. The paper is based on extensive real data that the authors obtained from the most important Czech power distribution and telecommunications operators.