---
title: Reality Driven Development Concepts
url: https://realitydriven.org/development
updated: 2026-08-21
---

# Reality Driven Development Concepts

## Build to Learn

Build to Learn is fast, provisional working software used to expose uncertainty. Its purpose is learning, not production readiness.

## Reality Loop

A Reality Loop is a structured cycle where stakeholders experience candidate reality, observations are captured, decisions are made, and the working model is revised.

## First Reality Loop

The first Reality Loop is the smallest safe adoption move for RDD. A team brings one uncertain initiative, names the commitment risk, chooses one candidate reality slice, captures evidence, and decides whether to loop again, stop, broaden, or prepare a delivery baseline.

## Delivery Baseline

A delivery baseline is the evidence-backed boundary where accepted behavior and known risks move into accountable production engineering.

## Freeze Gate

The Freeze Gate is the governance moment where a selected slice crosses from cheap learning into delivery obligation.

## Build to Deliver

Build to Deliver is production engineering after the delivery baseline. It includes architecture, security, quality engineering, performance, reliability, observability, compliance, and operational ownership.

## Reality Check

A Reality Check is a formal verification artifact that challenges accepted behavior against architecture, security, data, integration, accessibility, performance, regulatory, failure, and operational constraints.

## Evidence Layer

The evidence layer is the durable record of accepted behavior, rejected alternatives, decisions, risks, Reality Checks, and production telemetry.

## Requirement to Evidence

Requirement to evidence is the RDD artifact pattern where a vague requirement becomes candidate behavior, observed discrepancy, revised behavior, and baseline evidence.

## RDD Metrics

RDD metrics measure where disagreement appears and how much ambiguity crosses the delivery baseline. Useful measures include time to executable stakeholder feedback, significant disagreements surfaced during Build to Learn, discarded functionality before production engineering, post-baseline behavioral scope churn, UAT defects caused by misunderstood intent, Reality Check status, and percentage of production scope backed by accepted executable evidence.