Waterfall
Waterfall is a sequential software development methodology where progress flows steadily downward through defined phases including requirements, system design, implementation, testing, deployment, and maintenance. It emphasizes thorough documentation, fixed-scope planning, and phase-gate reviews before proceeding to subsequent stages. Waterfall remains widely used in regulated industries, government contracting, and projects with well-understood, stable requirements.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles Waterfall the way a machine reads it — 16 machine-readable artifacts, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Waterfall scores 15.3/100 (emerging), with a separate agent-readiness read of 0/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Waterfall
Each block below is one kind of artifact we hold for Waterfall. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
Features 5
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Sequential Phase Execution
Each phase (requirements, design, implementation, testing, deployment, maintenance) must be completed before the next begins, ensuring full documentation of outputs before proce...
Formal Phase-Gate Reviews
Structured review checkpoints between phases allow stakeholders to approve progression, ensuring deliverable quality and scope alignment before the next stage.
Comprehensive Documentation
Detailed documentation produced at each phase serves as the source of truth for subsequent phases and long-term system maintenance.
Fixed Scope and Requirements
Requirements are gathered and locked upfront, minimizing scope creep and providing high predictability for cost and schedule estimates.
Clear Milestones and Deliverables
Well-defined milestones at the end of each phase provide clear checkpoints for project tracking, stakeholder reporting, and regulatory compliance.
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Waterfall Context
JSON-LDUse Cases 5
What developers actually build with this provider — captured so the catalogue answers 'what is this for', not just 'what does this expose'.
What developers build with this provider.
Government and Defense Contracts
Regulated government and defense projects with fixed requirements, formal procurement processes, and strict documentation mandates benefit from Waterfall's structured approach.
Infrastructure and Construction Projects
Large infrastructure systems with well-understood requirements and high change-management costs suit the sequential Waterfall model.
Compliance-Driven Software
Healthcare, finance, and safety-critical systems requiring audit trails, formal verification, and regulatory approval align well with Waterfall's documentation-heavy phases.
Fixed-Bid Contracts
Projects delivered under fixed-price, fixed-scope contracts where up-front requirements definition is essential for accurate cost estimation.
System Integration Projects
Integrations between large enterprise systems where interface contracts must be defined and agreed upon before implementation begins.
Integrations 5
Pre-built integrations with other platforms tell you where this provider already fits in a stack.
Pre-built integrations with other platforms and tools.
Agile/Scrum
Many teams adopt hybrid models combining Waterfall for high-level planning and Agile for iterative delivery within phases.
V-Model
An extension of Waterfall that pairs each development phase with a corresponding testing phase, emphasizing verification and validation.
PRINCE2
UK government project management framework that incorporates Waterfall concepts into structured stage-gate delivery.
CMMI
Capability Maturity Model Integration often used alongside Waterfall in defense and aerospace software development programs.
DevOps
Some organizations blend Waterfall for requirements and architecture with DevOps practices for continuous delivery in later phases.
Resources
Every other property we hold for Waterfall — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 2
Reference material describing how the API behaves
Design & Contract 2
Pagination, idempotency, versioning, errors, and events
← All providers · Data indexed from github.com/api-evangelist/waterfall · machine-readable index on apis.io