“…In this vein, the NtN tutors' training course (i.e., the first activity of the intervention plan) was aimed at enhancing the university students' skills to efficiently perform the role and functions initially assigned. Thus, four three-hour sessions were delivered in two weeks (2 to 11 November 2016) using an active and participatory methodology to cover the following contents [31,33]: (a) session 1: introduction of the program staff, participants, and training plan, justification of the program, and description and use of the workbooks (i.e., study protocol: a set of materials in which each of the tutoring sessions was presented in a structured manner), (b) session 2: performance of the NtN tutees' needs assessment (i.e., instructions on how to analyze and to review the agenda and school material to establish and prioritize homework, doubts, problems, or difficulties on the instrumental curricular areas), and the design, planning, and execution of school supplemental activities, (c) session 3: the design, planning and execution of scientific-technological activities (i.e., presentation and curricular justification of the activities, and training in the IBSE teaching method: the procedure to be followed by NtN tutors when implementing the activities), and (d) session 4: evaluation and registration of the tutoring sessions, and analysis of potential difficulties or unpredicted situations during the tutoring sessions.…”