Act n. 276/2003 amended the part-time job rules and regulations, it also introduced a new type of contract for flexible work, the so-called job on call. In the essay, the state-of-the-art on the application of the rules and regulations for these two contracts is made, by examining both administrative acts - that helped clarifying the interpretation of such discipline - and the collective bargaining, often recalled by Act n. 276 to integrate or modify rules. Collective agreements renewed in the biennium 2004-2005 have been especially taken into consideration. Part-time job and job on call have the common capability to satisfy a need for temporary flexibility, creating work offer only when and where needed. Having said that, different options to increase the employee availability to vary his working schedule according to the employer needs are taken into consideration.