A Scalability checklist?

Hi everyone, I'm researching on Scalability for a college paper, and found this site great, but it has too many tips, articles and the like, but I can't see a hierarchical organization of subjects, I would need something like a checklist of things or fields, or technologies to take into account when assesing scalability. So far I've identified these: - Hardware scalability: - scale out - scale up - Cache What types of cache are there? app-level, os-level, network-level, I/O-level? - Load Balancing - DB Clustering Am I missing something important? (I'm sure I am) I don't expect you to give a lecture here, but maybe point some things out, give me some useful links... Thanks!

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