In this paper, the authors try to provide brief notes on the value of practical teaching and, in particular, two of its main techniques (scheduled exercises and problem solving sessions), using applications for mobile devices and social networks to work in group certain issues incardinated in the Criminal and Criminological Sciences. The training activity will take place, in parallel, inside the teaching of the Degree in Law and the Degree in Criminology. For each Degree (and its selected course) a group of students (with a maximum size of 5 members) will be created, each one coordinated by a teacher. This teacher will create a WhatsApp group in which he will announce to its members the guidelines to be developed by each of the different students, will attribute a certain individualized functions, and will guide them when executing. During a period of time, previously determined by the teachers, the working group members will use social networks (Twitter, Facebook, Instagram, etc.) to publish for the rest of the students small advances of the contents they will present on the designated date, to facilitate their classmates can make observations. Finally, such an exhibition will be held in person in the classroom, or via videoconference. In any case, the rest of the students must have an active participation, giving opinions and formulating the questions that they consider appropriate and those should be resolved by the students members of the working group.
