> ## Documentation Index
> Fetch the complete documentation index at: https://docs.brik64.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Digital Circuitality

> The theory and engineering discipline behind BRIK64.

Digital Circuitality is the discipline of designing software as closed, inspectable computational circuitry.

The central idea is simple: important logic should not depend on hidden paths, unbounded inputs, implicit side effects, or undocumented composition. It should be described through explicit components and explicit routes between those components.

## The Design Principles

| Principle              | Practical meaning in BRIK64                                               |
| ---------------------- | ------------------------------------------------------------------------- |
| Bounded domains        | Inputs and outputs should be named and constrained.                       |
| Atomic operations      | Critical behavior should be decomposed into monomers where possible.      |
| Explicit composition   | Sequential, conditional and parallel structure should be visible.         |
| Deterministic workflow | The same declared artifact should be reproducible under the stated scope. |
| Traceability           | Hashes, metadata, events and reports should explain what changed.         |
| Evidence status        | Strong statements must point to artifacts and scope.                      |

## How It Maps To BRIK64

BRIK64 turns Digital Circuitality into a developer workflow:

1. A requirement becomes a PCD Blueprint.
2. The PCD selects monomers for atomic operations.
3. EVA structure describes how operations compose.
4. A Polymer groups composed logic.
5. `.brik` records local traceability and evidence references.
6. CLI commands generate reports that can be reviewed by humans and agents.

## Theory And Product

Digital Circuitality is broader than the CLI. The CLI is the current public product path for applying the discipline locally. The theory pages and papers explain the mathematical direction; the command pages explain what is available in the developer workflow today.

Continue with [Theory Papers](/concepts/theory-papers) for source material and [PCD Tutorial](/language/pcd-tutorial) for implementation.