In 1999, Butler Lampson gave a talk about the past and future of “computer systems research”. Here are his opinions from 1999 on "what worked". Yes Maybe No Virtual memory Parallelism Capabilities Address spaces RISC Fancy type systems Packet nets Garbage collection Functional programming Objects / subtypes Reuse Formal methods RDB and SQL Software engineering Transactions RPC Bitmaps and GUIs Distributed computing Web Security Algorithms Basically everything th...