A tool easy to apply is presented that can be used in ergonomic analysis of 1st level to identify the risk factors of biomechanical overload of the skeletal structures. The model is an evolution of a previous proposal, published in 2001, which was aimed at evaluation of the only upper arms: the present model also permits the evaluation of the spine (cervical and torso-lumbar tract) and of the inferior arms. A red flag judgement criterion has been maintained and, if an item is marked, there is the possibility to recognise the cause of the ergonomic criticality and to plan the correction according to a scale of ergonomic priority. The aim of this communication is to stimulate a wide participation in the project to develop a model for the risk assessment of biomechanical overload to the whole skeletal system.