Multi-Skilled Workforce Optimisation

Workforce planning incorporating skills: State of the art

“…Therefore, Corominas et al [43] appear twice in the first column in Table 8. For the same reason, Eitzen et al [52], Fowler et al [57] and Heimerl and Kolisch [70] also appear two times in the first column because they assume that workers with a higher skill level are more efficient. Hence, the efficiency of the worker is integrated into the coverage constraint.…”

“…Table 1 shows the papers that make use of hierarchical and categorical skills. While most papers only consider one skill class in their problem, some researchers consider both classes at the same time [19,24,51,52,56,57,70,110] and talk about skill domains or categories and skill levels. In these papers, the authors assume that there exists a hierarchical structure in each skill category.…”

“…A worker with skills determined by the fourth determinant can do other things compared to a worker with other licenses/qualifications/job title. For determinants two to four, some papers can be found in both the hierarchical and categorical skill class [51,52,56,57,70,110]. This is because these authors consider the hierarchical and categorical skill class at the same time and assume that there exists a hierarchical structure in each skill category (see Section 3.1.1).…”

“…Wu and Lee [115] and Wu et al [117], for example, try to minimize the total completion time of projects where the speed of work is dependent on the skills of the assigned workers. Eitzen et al [52] and Fowler et al [57] assume that, depending on the skill level of a worker, a worker is equivalent to one or more workers. Hence, the skill level defines the efficiency of the worker.…”

“…As a positive consequence, adding more skills will not increase the number of decision variables in this type of models and does not affect computation time drastically. The number of workers on the other hand will have a significant impact on complexity [52].…”