Manuel Seco and his dedicated group of language professionals developed this successful project over a thirty-year period. The Diccionario del Espaol Actual is the first Spanish Dictionary, which includes the vocabulary of the second half of the twentieth-century using real records. All the information has been compiled from more than 1,600 books of all genres and thousands of periodic publications. In over 4,600 pages this dictionary studies 75,000 words, with 141,000 meanings and 200,000 quotes of uses of the actual Spanish language.
The distribution of senses and definitions has been done under new criterions to inform the users not only about the meanings, but also about the functions and places of every word in a sentence. Seco and his group focused and emphasized on two sides of a words content: the semantic value and the syntactic value, making this dictionary one of the most complete and practical works of reference.