Twelve weeks, each introducing one more way to run something where it does not belong — and what that way costs.

Each week takes one approach seriously: what it is, what it buys, and the limit it runs into. The limit is usually what the following week exists to answer.

Several concerns recur in different contexts: processes, the filesystem, the network, performance. Week 5 gives a program a basic filesystem; week 7 addresses filesystem coherence when two runtimes need the same one. Your understanding of each deepens as the semester goes on.