INAIL, with note No. 434/2012, specified that the apprenticeship contract is lawful even in case of written agreement lack, as long as the employment relationship has been communicated to the competent authority (so called “Centro per l’Impiego”) trough the mandatory communication so called “UniLav”. When, instead, there are neither a written contract nor the mandatory communication, it is a case of “moonlighting” with consequent impossibility for a subsequent regularization of the relationship through an apprenticeship contract.