SUMMARY Title: "The influence of communication and information technologies on textile sector small and medium sized companies. The effect of the implementation of e-commerce.” Author: F. Javier Muñoz Giner Director: Dr. Roberto García Payá This research work deals with a topic which is crucial for the competitive development of companies and which is therefore necessary for their very survival. The subject area is communication and information technologies and the influence these exercise on the technological capital of companies. In particular, the study was carried out within the Valencian Community textile sector. In the research, a specific management model for the companies which are the object of study has been proposed. Such model facilitates the elaboration of a technological strategy for information systems which is coherent with the general company strategy and which enables an efficient implementation of advanced management systems. The model established has been contrasted with real cases from the sector and an improved model has been obtained by means of qualitative techniques that facilitate selecting information systems that support business processes by dealing with various factors. Among these, the appropriate identification of elements critical to the implementation of these systems and their correct sequence are notable. Both technical and organisational factors are considered and special emphasis is made on specific aspects and functions for small and medium sized textile companies. The conclusions from the validation of the model in the Valencian Community textile production sector determine the priorities in order to strengthen current weak points and generate a competitive advantage that facilitates confronting the new market situation successfully and innovatively. The efficient implementation of advanced management systems and their evolution towards e-business is being used as a tool for competitive improvement.