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FOCUS Architecture — Interlude: Map of the trilogy
- Source: /library/FOCUS Architecture/source-file.pdf
- PDF pages: 21–23
- Pages without text: none
Map of the trilogy This is the second book in a trilogy, and you don’t need to have read the first one: each volume stands on its own. This interlude exists so you know what lives in each of them when a bridge shows up in the middle of a chapter, and so you can ignore it with a clear conscience. What each volume answers Spec Driven Development (2026, https://books.kodel.com.br/en/books/sdd) answers what and why: it’s about describing precisely what you want before asking for the code, so the work has a target to be checked against; you don’t need it to follow this book. FOCUS Architecture (2026, https://books.kodel.com.br/en/books/focus) is the one in your hands, and it answers where: how to organize code into slices with declared boundaries, so every change has an address. Context Engineering (2026, https://books.kodel.com.br/en/books/context-engineering) answers the question left over once the other two are standing: what the model sees right now, in this call’s window, and at what cost; it also reads on its own, and this book doesn’t depend on it on any page.
The order of the arrows is the order of the information, not a required reading order: the spec says what to do, the architecture says where what it asked for will live, and context carries both, in the right dose, to the model’s window. You can come in through any door.
Where this book fits The middle volume is the one that talks about code on disk. The discussion here is the folder, the file, the function’s signature, and what each of those choices charges whoever has to find a rule months later. A reader who has never heard of an executable specification can apply everything that follows; a reader who already uses the first volume’s flow will recognize the bridges and pick up two or three sentences of context when they appear. That’s this book’s commitment to the other two ends: when one of them gets cited, the citation comes by name, with the address, and with whatever is needed summarized on the spot, precisely so you never have to interrupt your reading. No page here assumes you own the other two books. Map in hand, on to the problem. Chapter 2 opens on a Monday when changing one line broke three screens.