Specification-First Delivery, or Spec-First Delivery, is a practical cross-functional engineering framework. It turns product intent, domain knowledge, constraints, and accountable judgment into a shared system that guides human and AI execution through acceptance, so organizations can deliver software they understand, trust, and are prepared to own.
Specification-First Delivery makes cross-functional participation, professional judgment, and accountable delivery explicit, so they can directly shape the software outcome.
Specification-Driven Development, also called Spec-Driven Development or SDD, and Specification-First Delivery share an important premise: implementation should follow explicit specifications rather than ad hoc prompting. They differ primarily in the design center and scope of governance expected of the specification system.
Spec-Driven Development (SDD)
Specification-First Delivery
Spec-Driven Development (SDD)
Turning intent into structured, executable development work.
Specification-First Delivery
Turning organizational knowledge and accountable professional judgment into trusted, continuable software delivery.
Spec-Driven Development (SDD)
Structured artifacts that guide clarification, planning, implementation, and verification.
Specification-First Delivery
An authoritative delivery layer connecting intent, decisions, execution, verification, acceptance, and retained knowledge.
Spec-Driven Development (SDD)
Project instructions, specifications, plans, and related artifacts provide durable development context.
Specification-First Delivery
A governed Knowledge System spans the product, domain, organizational, architectural, security, reliability, operational, decision, specification, evidence, and code knowledge required to understand and continue the software.
Spec-Driven Development (SDD)
Supports collaboration among people and AI participating in specification and implementation.
Specification-First Delivery
Makes cross-functional authorship, professional judgment, decision ownership, review authority, and human accountability explicit.
Spec-Driven Development (SDD)
Verifies that implementation satisfies the specification and associated checks.
Specification-First Delivery
Connects acceptance criteria and evidence to accountable roles and the requirements and constraints they own.
Spec-Driven Development (SDD)
Specifications and implementation artifacts remain useful context for later development.
Specification-First Delivery
Approved specifications, decisions, evidence, deviations, code, and delivery learning return to the Knowledge System to support Capability Continuity.
Specification-First Delivery can use SDD workflows and tools, including GitHub Spec Kit and Kiro. It defines the wider delivery system in which those workflows operate.
Ambiguity scales
When intent and constraints are implicit, each handoff and generated change can multiply interpretations before anyone sees the divergence.
It makes product and domain contributors direct participants in the delivery value chain while giving every role room to challenge, refine, and remain accountable for its own judgment.
Make product intent, domain knowledge, constraints, risks, and decision ownership inspectable and authoritative for every contributor.
Turn that shared context into an explicit, proportionate specification with scope, constraints, acceptance conditions, and open decisions visible.
Engineers and AI coding agents implement within an explicit scope and known constraints, challenging ambiguity rather than silently resolving it during delivery.
Review the completed delivery against intent, constraints, and evidence, then keep its decisions and rationale coherent with the software.
The organization retains the meaning, decisions, constraints, and evidence needed to continue responsible software delivery.
