The purpose of the theoretical framework of this paper is to explain the cooperation processes designed for small-sized firms, allowing access to the knowledge of the organization and inter-company cooperation. Data from 236 companies of the Spanish defense industry were used. Analysis of the principal components which group together all the variables from the questionnaire is carried out in order to determine the factors which will be taken into consideration in the analysis of inferences of the theoretical propositions and working hypotheses. The confirmation statistics of the hypotheses have been achieved using a multinomial logistic model. Further exploration on how cooperation levels relate to each other and with existing uses of information technologies in large companies could help improve the rigor of the results. Finally, conclusions covering theoretical and empiric aspects are shown.