The male youth development problems, the authoritarian school organization, the permanent school- watch, the curriculum organization and development, the hidden curriculum, the evaluation system, the Portuguese Youth National Organization (Organizacao Nacional Mocidade Portuguesa), the social patterns, the scholar marks and prizes, the selective inputs and trajectories in school, the families' expectations, the resistance towards schooling, the opposition against the political regime É can prefigure a framework to analyse the pupils' indiscipline phenomena in the Portuguese classical lyceum schooling between 1942 and 1964. The present paper is based on an empirical analysis of 1756 records of "disruptive" behaviour of the male students of the D. Manuel II Lyceum in Porto, one of the most remarkable schools in Portugal at the time. This work intends to make a contribution to the discussion of the indiscipline phenomena focusing in a case study, in which the educational actors and the contexts of the scholar work play the main role.