**1.5. Peer-assisted learning**

*Peer-assisted learning* (PALS) involves classmates of equal status actively helping each other to acquire knowledge and skills [8]. It subsumes *Reciprocal Peer Tutoring*, which places same-age students into pairs of comparable ability and gives them the responsibility is to keep each other engaged academically [9]. Peer-assisted learning is based on cooperation, as assistance and encouragement tends not to take place in competitive interaction.
