With this communication we try to show the importance of beginning the evaluation of psychosocial risks, as it forces the law of prevention of Labour Risks, by means of the evaluation of the quality of working life, that is the one that must be taken like reference in the evaluative process of the problems of psychosocial and organizational character from a company. We define the concept of quality of working life differentiating it from the term Job Satisfaction and clarifying the difference with the concept of Organizational Culture. Also, one appears a theoretical model and a questionnaire for the evaluation of the quality of working life, with the main variables of analysis and the dimensions of each of them.