The recognition of individual differences urged in section 1 necessitates a differentiation and a flexibility of the high school curriculum that is limited only by the social and individual needs to be served, the size of the school, and the availability of means. The rigid inflexibility of the inherited course of study has contributed perhaps more than its full share to the waste product of the educational machinery. The importance of this change from compulsion and rigidity toward greater flexibility has already received attention and commendation. One authority[57] states that "one main cause of (H.S.) elimination is incapacity for and lack of interest in the sort of intellectual work demanded by the present courses of study," and further that "specialization of instruction for different pupils within one class is needed as well as specialization of the curriculum for different classes." There must be less of the assumption that the pupils are made for the schools, whose regime they must fit or else fail repeatedly where they do not fit. Theoretically considerable progress has already been made in the differentiation of curricula, but in practice the opportunity that is offered to the pupils to profit thereby is curtailed, because of the rigid organization of courses and the uniform requirements that are dictated by administrative convenience or by the college entrance needs of the minority. The only permissible limitations to the variables of the curriculum should be such as aim to secure a reasonable continuity and sequence of subjects in one or more of the fields selected. One of the chief barriers to a more general flexibility has been the notion of inequality between the classical and all other types of education. This assumption has had its foundations heavily shaken of late. The quality of response which it elicits has come to receive precedence over the name by which a subject happens to be classified. "France has come out boldly and recognized at least officially the exact parity between the scientific education and the classical education."[58] Indeed one may doubt whether this parity will ever again be seriously questioned, because of the elevation of scientific training and accomplishment in the great world wars as well as in its adaptation for the direct and purposeful dealing with the problems of modern life. Especially for the early classes in the high school does the situation demand a relatively flexible curriculum, else the only choice will be to drop out to escape drudgery or failure. Inglis maintains that the selective function of the high school may operate by a process of differentiation rather than by a wholesale elimination.[59] The pupil surely cannot know in advance what he is best fitted for, but the school must help him find that out, if it is to render a very valuable service, and one at all comparable to the success of the industrial expert in utilizing his material and in minimizing waste.