Recruitment : what is the best method ?

What is the best method at the moment in order to recruit on a labour market which is straighter and straighter ? It is recruitment through the relational network of one's own engineers or technicians. That is the method of Cadence, a company settled in Sophia Antipolis (creation of software tools for chips design). Almost 75 % of the recruitment on all group sites is done this way. A 7.000 dollars bonus is paid to an employee who, by the means of his acquaintances or by the means of his former mates of the engineer school, allow an hiring. That method works and, moreover, it is shown to be less expensive than so numerous ads in the daily press and in specialized magazines or than having to call on a head-hunters consultancy.