• Convenient provision of authentication and authorization is crucial. This can be achieved by using automatic provision via Web interface to users, batch provision to educators for courses and training events, and provision of certificates via prerequisite self-paced exercises (summer schools).
• The provision of directly accessible training material should be prioritized. We provided training material via trainer-maintained wiki pages on GILDA and through the ICEAGE and EGEE digital libraries. Trainer materials should be strictly related to and tested on the t-infrastructure (limiting the problem of adapting a generic procedure to a specific context).
• Developers of training infrastructure should use virtual machines for support systems administration training and for provision of reconfigured middleware as a downloadable, installable context for users to experience.
• Web portals ameliorate interface complexity, as we identified specifically in the cases of GENIUS and P-GRADE. We also provided continuous access to training platforms such as GILDA.