This document contains five papers from a 1999 workshop in Rome on enhancing the professional skills and qualifications of trainers in open and distance learning organized by the TTnet network (Training of Trainers network). "The Different Types of Open and Distance Training and Their Impact on Trainers' Skills" (Michel Tetart) examines the following topics: the principles and realities of open and distance learning today; assisted self-training; and requirements related to professionalization. "Open and Distance Learning and the Professionalization of Trainers: Types of Distance Learning and Impact on Trainers' Skills" (Luciano Battezzati) reviews prospects and trends in the demand for training, proposes an initial classification of technologies, and examines the applications of various educational technologies. "Changes to the Roles and Competences of In-Company Trainers within Training Systems Using Multimedia: Future Prospects Based on the Practice of Two High-Tech Companies" (Jeanne Mallet) explores how new educational technologies have changed the functions of trainers and simultaneously facilitated the professionalization of trainers. "Distance Learning Schemes for Trainers: Features of Teaching and Education" (Michele Pellerey) discusses the mission of training programs and selection of training models. "Mentor in Cyberspace: Developing Interactive On-Line Training and Support" (Simon Walker) reports on a study of the effectiveness of using interactive multimedia to supplement the training of mentors in the vocational education and training sector. Two papers contain substantial bibliographies. (MN)