“…The operative definitions contained in the instruments are not consensual and, despite not being antagonistic, they refer to an overlap of premises or aspects that characterize them. The reviewed studies include a wide range of concepts that may not be directly related to each other, being conceptually independent, but that indirectly make up the overall perceived workload [1,13,15,16,19,22,24]. An example of this, are instruments that point out factors such as: work pressure [1,13,15,17,24], the pace of work [16,19], the time available to provide care [1,13,15,17,24], the impact of work on family life [21][22][23], staffing/professional ratios [1,13,15,17], carrying out administrative or non-care-related tasks [13], physical, cognitive and emotional effort [22] or, the availability of resources [1,25].…”