(c) Technical aptitude revealed by former pupils and their capacity of adaptation to the various industrial works.
(d) Progress of increase in salary of former pupils.
(e) All available information as to individual former pupils with regard to the advantages or disadvantages of their schooling in the decision of economic life, and their success in it.
Art. 25. All posts of assistants and substitutes in the vocational system shall be filled by competitive examinations.
(a) For the assistant in drawing in the vocational schools in institutes for boys, the examination shall be tests in drawing, in artistic training, and in pedagogical fitness.
(b) For the filling of the same post in the vocational schools and institutes for girls the examination shall be tests in writing at dictation, in decorative composition, in embroidery and lacework, and in pedagogical fitness.
(c) The competitive test for filling the post of substitutes in shopwork shall be upon vocational design of an assigned theme for shopwork and the execution of the same.
Art. 26. The teachers in vocational instruction shall be named by means of promotion of the assistants and substitutes.
Art. 27. There shall be a substitute for every group of 20 pupils in shopwork, and an assistant for every class of 30 pupils.
Art. 28. When any primary school is transformed into a vocational school there shall be annexed the elementary primary course in which shall be taught intensively the manual arts prescribed for the elementary instruction of the institutes, but the pupils shall attend the shopwork of the vocational courses only when they have completed the work of the middle course and attained the age of 13 years.