Terminology

2205 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 areas2205 Architecture Fundamentals77 Distributed Systems107 Data Architecture110 Cloud Architecture94 Networking88 API & Integration Architecture82 Reliability & Resilience75 Observability70 Performance & Capacity Engineering72 Security Architecture86 Cost Architecture & FinOps71 Business Architecture67 Architecture Communication67 Enterprise Architecture66 Legacy Modernization71 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 concept794 practice734 pattern368 metric125 case-study77 tool62 protocol45

734 terms shown.

Term	Kind	Topic	What it is
Tail-Based Sampling Post-Trace Sampling, Intelligent Sampling	practice	Sampling	Deciding whether to keep a trace after it completes, so that errors and slow requests are always retained while ordinary traffic is sampled cheaply.
Technical Depth Calibration	practice	Presenting to Engineers	Matching the level of detail and the mode of engagement to an engineering audience, which needs reasoning and the opportunity to disagree.
Technical Leadership	practice	Technical Leadership	Setting technical direction and raising the standard of decisions across an organisation — largely without authority and largely through other people.
Technical Proposal Design Doc, RFC	practice	Architecture Communication	A written argument for a course of action, circulated for review before the work starts, structured so that disagreement surfaces early and cheaply.
Technical Proposal Structure	practice	Technical Proposals	An arrangement for a written design proposal that lets reviewers engage with the decision rather than reconstructing the problem.
Technology Evaluation Criteria	practice	Technology Selection	A standing set of dimensions for assessing a candidate technology, ensuring that operability and longevity are weighed alongside capability.
Technology Selection	practice	Technology Selection	Choosing a technology on the basis of fit, operability and organisational capacity — with a strong prior toward what you already run well.
Technology Stack Standardisation	practice	Technology Architecture	Converging on a supported set of platforms, languages and tools to reduce operational surface, while allowing justified exceptions.
Technology Standards	practice	Technology Standards	Constraining technology variety to reduce operational cost — with a waiver path, or the standard is broken quietly rather than formally.
Telemetry Cost Control	practice	Telemetry Cost	Managing the spend on logs, metrics and traces, which in mature estates can approach or exceed the cost of the infrastructure being observed.
Telemetry Cost Management	practice	Telemetry Cost	Controlling observability spend through sampling, retention tiering and cardinality limits without losing diagnostic capability.
Telemetry Sampling	practice	Observability	Keeping a subset of traces or events to bound observability cost, chosen so the ones that matter survive.
Template Propagation Getting Improvements Into Existing Services, Template Drift	practice	Service Templates	The mechanism by which improvements to a service template reach the services already generated from it - the hardest part of the template model and the part most often omitted.
Term Definition Ownership	practice	Business Glossary	Assigning one accountable owner per business term, so that a disagreement about meaning has a route to resolution rather than a standing argument.
Test Architecture Strategy	practice	Test Architecture Strategy	A written decision about which risks are covered by which kind of test, at what scope, run at what point, and which risks are accepted.
Test Data Management	practice	Test Data Management	The problem of getting data that is realistic enough to find defects and safe enough to exist outside production.
Test Data Provisioning	practice	Test Data Management	Getting each test the data it needs, in a state it can rely on, without copying production personal data into a weaker environment.
Test Quarantine Flaky Test Isolation	practice	Flaky Test Management	Removing an unreliable test from the blocking suite immediately, so it stops eroding trust, while keeping it running non-blocking until it is fixed or deleted.
Testing in Production TIP	practice	Testing in Production	Deliberately validating behaviour against real traffic, data and scale, using controls that bound the blast radius.
Testing Strategies	practice	Testing Strategies	Choosing what to test at which level, optimising for confidence per unit of time and maintenance rather than for coverage.
Third-Party Risk Assessment Vendor Risk, Supplier Assurance	practice	Third-Party Risk	Evaluating the security, resilience and compliance posture of suppliers whose failure would become your incident.
Third-Party Script Governance Page as an Execution Environment, Vendor Script Review	practice	Frontend Security	Reviewing and constraining what executes on a page, because every third-party script runs with the page's full privileges - and each one is added individually while the aggregate determines the security posture.
Threat Modelling	practice	Security Architecture	A structured exercise that identifies what can go wrong with a design, before it is built, by walking the system's trust boundaries.
Time to First Success Time to Hello World, Onboarding Latency	practice	Platform Adoption	How long it takes a new team to get something working on the platform - the single best proxy for developer experience and the strongest predictor of adoption.
Time-Boxed Waiver	practice	Exception & Waiver Management	An approved deviation from a standard that carries an owner, a justification, a compensating control and an expiry date after which it is reconsidered.
TOGAF	practice	Enterprise Architecture	An enterprise architecture framework whose central element is the ADM, an iterative cycle from vision through business, data, application and technology architecture to implementation governance.
TOGAF in Practice	practice	TOGAF	The most widely adopted enterprise architecture framework — useful as a checklist and vocabulary, harmful when followed as a process.
Token Audience Validation Audience Restriction, aud Claim	practice	Tokens & JWTs	Verifying that a signed token was issued for the service consuming it, without which a legitimately obtained low-privilege token is replayable against a high-privilege service.
Token Budget Enforcement	practice	AI Gateways	Limiting token consumption per user, tenant, feature or time window at a central point, so cost cannot run away unobserved.
Token Cost Attribution	practice	AI Cost Management	Assigning inference spend to features, tenants and users, so that cost can be managed by the people who influence it.
Tool Schema Design	practice	Tool Calling	Defining the tools available to a model — names, descriptions, parameters and errors — in a way that makes correct selection likely.
Trace Sampling Strategy Head Sampling, Tail Sampling	practice	Sampling	Deciding which traces to keep, since retaining all of them at scale is unaffordable and retaining a random few loses exactly the interesting ones.
Trade-off Analysis	practice	Meta-Skills	Making the costs of an architectural choice explicit and comparable, rather than presenting a recommendation as if it were free.
Trade-off Analysis Methods	practice	Trade-off Analysis Methods	Structured ways to compare architectural options — valuable for making reasoning explicit, dangerous when they produce false precision.
Trade-off Framing	practice	Explaining Trade-offs	Presenting a decision as a choice between named costs rather than as a search for a best option, so the audience can exercise the judgement that is properly theirs.
Traffic Shadowing Dark Launch, Mirroring, Shadow Traffic	practice	Strangler Fig	Sending real production traffic to a new implementation alongside the old one, serving the old response and comparing - the only reliable way to find undocumented behaviour before it matters.
Transactional Audit Emission Audit in the Same Transaction, Complete Audit Guarantee	practice	Auditability	Writing the audit record in the same transaction as the state change it describes, so that a crash cannot produce a change with no record - the property that distinguishes an audit trail from application logging.
Trigger Condition Revisit Trigger, Decision Tripwire, Monitorable Assumption	practice	Deciding Under Uncertainty	A specific, observable condition recorded alongside a decision that indicates it should be reconsidered - converting a point-in-time judgement into a monitorable position.
Trough-Based Commitment Baseline Reservation, Commit to the Floor	practice	Reserved & Committed Capacity	Sizing reserved capacity to the quietest period rather than the average, because only the trough is capacity you are certain to use for the whole commitment term.
Trunk-Based Development TBD	practice	Branching Models	All developers integrate small changes into a single shared branch at least daily, keeping it always releasable.
Trunk-Based Development in Practice	practice	Trunk-Based Development	Everyone integrates to one shared branch at least daily, with incomplete work hidden behind flags rather than isolated in branches.
Trust Boundary Classification Where mTLS Is Required, Encryption Scope	practice	TLS & Certificates	Writing down which network segments count as trust boundaries, so that mutual TLS is applied where it changes the security posture rather than uniformly or by intuition.
Trust Boundary Diagram	practice	Communicating Threat Models	A diagram marking where data crosses between zones of differing trust, which is the structure a threat model is built on and the form security findings are best communicated in.
Ubiquitous Language	practice	Domain-Driven Design	A shared vocabulary used identically by domain experts and in the code, so that translation between business and implementation is unnecessary.
UI Monorepo Strategy	practice	UI Monorepo Strategy	Whether frontend code lives in one repository or many — a trade between atomic change and independent release.
Update Cadence Commitment Next-Update Promise, Incident Comms Rhythm	practice	Presenting to Executives	Promising when the next update will arrive rather than when the problem will be fixed, so the one commitment made during an incident is one the team can actually keep.
Usage Telemetry Who Calls This, Consumer Visibility	practice	Platform Telemetry	Per-capability, per-consumer usage data about a platform's own surfaces - the precondition for every deprecation, roadmap and change-impact decision a platform team makes.
Usage-Based Access Review Last-Used Entitlement Review, Evidence-Based Access Recertification	practice	Identity & Access Management	Recertifying entitlements against observed use rather than against manager approval, so unused permissions are removed by default instead of being re-approved by someone who cannot evaluate them.
Use Case Risk Classification	practice	AI Risk Tiering	Assigning an AI application to a risk tier based on the consequence of it being wrong, which then determines the obligations that apply.
USE Method	practice	Observability	For every resource, track Utilisation, Saturation and Errors — the resource-centric complement to request-centric monitoring.
User Journey SLO Critical User Journey, CUJ	practice	SLI, SLO & SLA	Defining reliability targets around what a user is trying to accomplish, measured where the user is, rather than around per-request success rates at the server.
Utilisation Target	practice	Queueing Theory	The operating point chosen from a latency requirement rather than from cost efficiency, because queueing delay rises non-linearly as utilisation approaches saturation.
Utility Tree	practice	Quality Attributes	A structured decomposition of quality attributes into concrete, prioritised scenarios, used to focus architectural analysis on what actually matters.
VPC Design	practice	VPC Design	How virtual networks, subnets and connectivity are structured — decisions that are cheap now and extremely expensive to change later.
Waiver Expiry Time-Bounded Exception, Expiring Risk Acceptance	practice	Exception & Waiver Management	A mandatory end date on every exception to a standard, so that continuing the exception is an active decision rather than the default.
Warehouse Migration	practice	Warehouse Migration	Moving analytics from one platform to another, where the difficulty is almost never the data and almost always the accumulated logic and consumers.
Warm Standby	practice	Disaster Recovery	A continuously-replicated, scaled-down running copy of a system in a second location, ready to take traffic within minutes.
Waste Elimination Zero-Reliability-Cost Reduction, Cloud Hygiene, Orphan Cleanup	practice	Waste Elimination	Removing spend that buys nothing - orphaned resources, oversized instances, idle environments, over-retention - which is typically a substantial fraction of an unmanaged estate and costs no reliability whatsoever.
Waste Elimination	practice	Waste Elimination	Removing spend that produces no value at all — the least controversial and most consistently available saving.
Web Performance Budget	practice	Web Performance Budgets	An enforced limit on payload size, resource counts or timing metrics, checked automatically so regressions fail the build rather than accumulating.