The work provides new knowledge on the infantile language and the creation and development of applicable diagnostic tools to individuals and Spanish speaking infanto-juvenile groups.

It is about two kinds of highly related contributions :

• the standard studies of language;
• the design and adaptation of techniques in order to evaluate vocabulary on early ages.

For the normative study of language in the first 5 years of life, the authors and collaborators investigate the vocabulary of 200 children from 11 to 49 months of age, patiently gathering their spontaneous productions in games' situations through a careful design of rigorous methodology, which allowed publishing their results in a specialized magazine published in USA, the Behavior Research Methods, Instruments and Computers. The arbiters' team of this magazine approved the article considering the universality of the methodological contribution beyond language which was reason of the study, in this case Spanish.

A second database was obtained during school age, with variables related to the frequency of oral and written use of the words. This result and the previous one are particularly important for specialists of linguistic psychology and pedagogy to be used as banks of stimuli for different tasks.

It was carried out the third result that completes the standard study, starting from the nomination of figures standardized at international level, carried out for the first time in Cuban children, which allowed characterizing the linguistics and cultural particularities of the studied population. This figures' standard work is the second one which exists for children and the first one for Spanish speaking children. It has been partially published in Cognitiva magazine, from Spain, and the publication of its second part has been accepted in another Spanish magazine.

The researches leading to the design and adaptation of techniques for the evaluation of vocabulary in early ages, resulted in obtaining three tests or diagnostic methods, two of which consist on the adaptation to Spanish language and the contextualization of two tests originated in English-speaking countries, taking into account our culture’s particularities, evidenced in previous studies carried out by the same authors. The third test consists on an original test, the Inventory of First Words (IPP) which constitutes an instrument to evaluate specifically the expressive vocabulary and allows performing longitudinal studies.

Besides these three international publications, the work has generated others which appeared in Mexico (2) and in Cuba (5), it has been acknowledged in many national events and it has received references from the Latin American Reference Center of Special Teaching. Its results have been practically introduced in institutions of the Ministry of Education of Cuba (MINED).