Why do we need centres?

Researchers will only use certain resources and certain tools/services offered via the web when they are sure that they can access them also during a longer period. Currently, researchers mostly download resources first to their computer to create accessibility, but in the cyberinfrastructure scenario with the many big resources and collections this way is not suitable anymore. So availability and accessibility has to be guaranteed by institutions with a clear service oriented attitude that do pose as little restrictions as possible on the usage by the researchers. Only this new type of centres can give such guarantees.