Terminology

991 terms, tools, patterns and metrics an architect is expected to use precisely. Each one gets a short explanation of what it is, and — where it matters — what it is commonly confused with. Search filters as you type; the column headers sort.

All areas991 Architecture Fundamentals38 Distributed Systems73 Data Architecture71 Cloud Architecture55 Networking51 API & Integration Architecture45 Reliability & Resilience40 Observability33 Performance & Capacity Engineering34 Security Architecture50 Cost Architecture & FinOps30 Business Architecture28 Architecture Communication27 Enterprise Architecture27 Legacy Modernization27 AI-Era Architecture34 Software Architecture & Engineering37 Architecture Patterns34 Architecture Decision-Making30 The Architect's Meta-Skills27 Delivery & Release Engineering20 Platform Engineering & Developer Experience20 Testing & Quality Architecture20 Data Platform Architecture20 Streaming & Real-Time Data20 Data Governance & Semantics20 Frontend & Experience Architecture20 Edge, Mobile & IoT20 Regulatory & Data Protection Architecture20 Assurance, Audit & Model Risk20

Kind Any concept379 practice294 pattern166 metric55 tool36 protocol35 case-study26

11 terms shown.

Term	Kind	Topic	What it is
Arrival Rate Model	concept	Performance Test Design	Driving a load test by requests arriving per second regardless of how the system responds, rather than by a fixed number of virtual users.
Consumer Contract	concept	Consumer-Driven Contracts	A machine-readable record of exactly which parts of a provider's response one consumer relies on, generated from that consumer's own tests.
End-to-End Test Cost Curve	concept	End-to-End Test Economics	How the cost of a broad end-to-end suite grows with its size while its marginal value falls, and where the two cross.
Production Parity Gap	concept	Environment Parity	The enumerated list of ways a pre-production environment differs from production, which is the list of defect classes it cannot catch.
Service Stub Fidelity	concept	Service Virtualisation	How faithfully a stand-in dependency reproduces the real one's behaviour — including its errors, latency and limits — which bounds what testing against it proves.
Steady-State Hypothesis	concept	Chaos as a Test	The measurable statement of normal behaviour that a chaos experiment predicts will hold while a fault is injected, without which the exercise is not a test.
Synthetic Data Fidelity	concept	Synthetic Data	How closely generated data reproduces the shape, distribution and awkwardness of the real thing, which decides what the data can validly be used for.
Test Double Boundary	concept	Integration Test Boundaries	The line inside a test between what is real and what is substituted, which determines exactly what the test can and cannot prove.
Test Strategy Altitude	concept	Testing & Quality Architecture	Deciding which risks are verified at which level, so that each layer tests something the layers below it structurally cannot.
Testability as a Design Property	concept	Test Architecture Strategy	How cheaply a system's behaviour can be observed and controlled, which is decided by architecture and largely fixed before any test is written.
Testing Trophy	concept	Test Pyramid Shapes	A distribution weighted towards integration tests rather than unit tests, appropriate where most of the risk lives at boundaries rather than in logic.