The degree of mobility an individual can demonstrate to get a job, keep it and update occupational competences. Employability results from both the rational criteria (job profile, skills, know-how) and the irrational/implicit criteria used by employers for recruitment. The employability of an individual is linked to his/her ability to acquire new competences, in other words, to his/her "educability". This latter concept stresses the ability of the individual to achieve his/her personal development, whereas the concept of employability stresses the capacity of the individual to adapt to market needs in terms of profitability.