When performing a search of some content within documents; It is usually a very heavy work when looking at the original sources, it is already known that the classification of documents allows according to a theme to group the documents according to this criterion, the contents that you want to locate are regularly associated with a topic of Therefore, this article shows the use of a technique that prioritizes the elements of a criterion (ABC’s Pareto method), to focus the searches within an interest group, and with that the search is carried out on a number lower documents, achieving greater efficiency in the results at a reasonable cost of effectiveness, additionally, shown the word space model in the document classification process.