Terminology

2185 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 areas2185 Architecture Fundamentals77 Distributed Systems107 Data Architecture110 Cloud Architecture89 Networking88 API & Integration Architecture82 Reliability & Resilience75 Observability70 Performance & Capacity Engineering72 Security Architecture81 Cost Architecture & FinOps66 Business Architecture67 Architecture Communication67 Enterprise Architecture66 Legacy Modernization66 AI-Era Architecture69 Software Architecture & Engineering71 Architecture Patterns71 Architecture Decision-Making63 The Architect's Meta-Skills61 Delivery & Release Engineering66 Platform Engineering & Developer Experience70 Testing & Quality Architecture66 Data Platform Architecture64 Streaming & Real-Time Data69 Data Governance & Semantics69 Frontend & Experience Architecture66 Edge, Mobile & IoT68 Regulatory & Data Protection Architecture65 Assurance, Audit & Model Risk64

Kind Any concept785 practice729 pattern362 metric125 case-study77 tool62 protocol45

9 terms shown.

Term	Kind	Topic	What it is
Coexistence Period	concept	Coexistence Patterns	The interval during which old and new systems both operate and must be kept consistent, which is longer, more expensive and riskier than most plans assume.
Feature Parity Trap	concept	Rebuild vs Re-architect	The expectation that a replacement system must match every behaviour of the old one before it can be adopted, which is what makes rewrites never finish.
Greenfield Velocity Illusion Rewrite Head Start, Front-Loaded Rewrite Progress	concept	Rebuild vs Re-architect	The early speed advantage a from-scratch rebuild shows because it is running with all the real constraints switched off, which makes its estimate systematically wrong in the same direction every time.
Managed Service Upgrade Calendar Provider Support Lifecycle Exposure, Vendor Upgrade Clock	concept	Replatforming	The obligation, transferred to the provider at replatform time, to upgrade before a published end-of-standard-support date, which converts an indefinitely deferrable version upgrade into a dated one the team d…
Re-architect vs Rebuild	concept	Legacy Modernization	Restructuring an existing system incrementally versus writing a replacement from scratch — and the strong evidence that incremental wins.
Rearchitecture Threshold	concept	Refactoring & Re-architecting	The conditions under which rebuilding a system is justified, given that it is the most expensive treatment and is chosen far more often than it is warranted.
Reference Data Drift Code List Divergence, Static Data Staleness	concept	Data Migration Strategies	The divergence between a source system's lookup tables and the copy taken at the start of a long migration, which turns into silent transaction rejections in the new system months later.
Repurchase Displacement Cost Buy-Instead-Of-Build Migration Load, SaaS Substitution Overhead	concept	The Six Rs	The data migration, process change, integration rebuild and customisation retirement that replacing a bespoke application with a purchased product creates, none of which appears in the licence comparison that …
Six Rs of Migration 6 Rs, Migration Strategies	concept	Legacy Modernization	The standard menu of options for each application in a migration — rehost, replatform, refactor, repurchase, retire, retain.