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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

794 terms shown.

Term Kind Topic What it is
Shared Responsibility Model concept Managed Services The division of duties between provider and customer, which shifts with the service model and is routinely misunderstood in the customer's disfavour.
Shared Singleton Skew Duplicate Framework Instance, Singleton Version Mismatch concept Module Federation The failure class created when independently built front-end bundles expect different versions of a library that must exist once per page, producing either incompatible reuse or two isolated copies that share …
Shared-Service Commons Free-at-Point-of-Use Platform, Uncharged Internal Platform concept Showback & Chargeback The failure mode where cost allocation prices each team's own resources but leaves internal platforms free to use, so teams move cost onto the shared estate instead of removing it and total spend rises while e…
Shared-Team Queue Central Team Bottleneck, Review Queue concept Operating Models The queueing behaviour of any central team that must approve or perform work for many others, where waiting time rises sharply as utilisation approaches capacity and teams begin routing around the control.
Sidecar Interception Boundary Mesh Coverage Boundary, Proxy Capture Scope concept Sidecar & Ambassador The precise set of traffic a sidecar proxy actually sees and can secure, which is narrower than "all traffic from this pod" and is what decides whether a mesh's guarantees apply to a given call.
Sidecar Resource Overhead concept Sidecar & Ambassador The cumulative CPU, memory and latency cost of running helper containers alongside every application container.
Silent Coercion Type Coercion on Ingest, Quiet Data Corruption concept Ingestion Patterns An ingestion pipeline converting a value it did not expect rather than rejecting it - the worst available failure mode, because the load succeeds and the data is wrong downstream with nothing indicating it.
Silent Control Failure Dormant Control, Control Decay concept Control Design vs Operation A control that has stopped operating while still reporting success, so the organisation keeps making decisions on the assumption that it is protecting them.
Silent Data Failure No Error, Plausibly Wrong, Quiet Breakage concept Data Observability A data problem that produces no error - the pipeline succeeded, the schema was valid, the numbers were plausible - which is why error-based monitoring cannot detect it and why it persists for weeks.
Silent Quality Regression Payload-Level Degradation, Unasserted Output Failure concept Failure Thinking A defect that leaves status codes, latency and throughput normal while making the content of responses worse - so every envelope-level alert stays green and the only available signal is statistical.
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.
SLA Measurement Point Measurement Boundary, Observation Point concept Negotiation The place in the request path where an availability or latency commitment is observed, which decides what the number means and is where nearly every SLA dispute actually originates.
Small File Problem concept File Formats & Compaction The severe query degradation caused by a table stored as very many tiny files, where per-file overhead dominates actual data reading.
SOLID Principles concept SOLID Five object-design principles whose architectural value lies almost entirely in the last one — dependency inversion.
Solution Architecture concept Architecture Fundamentals The design of a specific system that satisfies a specific business problem under a specific set of constraints.
Source NAT SNAT, Masquerading concept NAT & Egress Rewriting the source address of outbound packets so that many private addresses share one public address, with a translation table mapping replies back.
Span Link Trace Link, Span Reference concept Distributed Tracing A pointer from one span to another span in a different trace, recording a causal relationship where no single enclosing parent exists - the mechanism that keeps batch jobs, fan-in consumers and delayed asynchr…
Speculative Abstraction Premature Abstraction, Anticipatory Design concept Design Patterns Structure added for variation that has not occurred - paying certain indirection now for a benefit that depends on a guess about the future.
Split Brain concept Leader Election A partition in which two subsets of a cluster each believe they are authoritative, accepting conflicting writes that cannot afterwards be reconciled.
Split Vote concept Leader Election An election in which no candidate obtains a majority, so the term ends with no leader and the process must repeat.
SQL Transformation Model concept Transformation Frameworks A named, versioned, tested SELECT statement that declares its own dependencies, turning transformation logic into reviewable software.
SQL vs NoSQL concept Architecture Decision-Making A choice driven by access patterns, consistency requirements and query flexibility — not by data volume, which is the reason usually given.
Standardisation Blast Radius Monoculture Exposure, Standard Concentration concept Technology Standards The property that a technology standard concentrates exposure as well as capability - one flaw in the standardised component applies to the whole estate - which turns the ability to change it everywhere at sho…
Standing Credential Long-Lived Credential, Persistent Secret, Static Key concept Secrets Management A credential that remains valid indefinitely, so a single leak grants permanent access - the property that converts a small compromise into a large one, and the one a secrets manager does not fix.
Stateful Packet Filtering concept Firewalls & Security Groups Filtering that tracks connection state, so return traffic for an allowed outbound connection is permitted automatically.
Stateful Stream Processing concept Stateful Stream Processing Stream computations that must remember information across events — aggregations, joins, deduplication, sessionisation — and the durability machinery that makes them recoverable.
Static Stability Fail Static, Configuration Inertia, Control-Plane Independence concept Cloud Architecture Designing a system so it continues operating correctly on its existing configuration during a failure, requiring no control-plane action to survive - because control planes are the part most likely to be unava…
Static Stability Stability Under Failure concept Static Stability A system that keeps working correctly in its current state when its control plane or dependencies become unavailable, rather than needing them to stay running.
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.
Storage Costs concept Storage Costs Storage is cheap per gigabyte and expensive in aggregate — controlled by retention and tiering rather than by unit price.
Stream-Table Duality concept Stream-Table Duality The equivalence between a stream of changes and a table of current state, where each can be derived from the other.
Streaming Cost Model concept Streaming Cost The cost structure of an always-on streaming system, where compute runs continuously regardless of volume and cross-zone data movement is a major line item.
Streaming Data Architecture concept Streaming Data Processing unbounded data continuously, where the central problems are time semantics, lateness and state rather than throughput.
Streaming Join concept Streaming Joins Combining two streams, or a stream and a table, where the records to be joined may not arrive at the same time or in the same order.
Strong vs Eventual Consistency concept Architecture Decision-Making A per-operation decision, not a per-system one: whether this specific read must reflect every completed write.
Style versus Pattern concept Architecture Styles The distinction between a system-wide organising structure and a reusable solution to a recurring problem within it.
Subagent Context Isolation Parallel Context Windows, Context Partitioning Across Agents concept Multi-Agent Systems The property that makes multi-agent systems worth their cost - each subagent explores with its own context window and returns only a condensed result, so the system reads far more than one context could hold.
Subject Naming Strategy concept Schema Registry How schemas are keyed in a registry — per topic, per record type, or both — which determines whether one topic may carry several event types.
Submission Deadline Architecture concept Regulatory Reporting Pipelines Designing a reporting pipeline around a fixed external deadline, where late is a breach and the recovery window is part of the schedule rather than a contingency.
Subnet concept Networking A subdivision of a network's address range, used as the unit of routing and, in cloud, of availability-zone placement.
Suite Reliability Arithmetic Per-Test Flake Rate Derivation, Suite Green-Rate Calculation concept Testing Strategies The calculation that turns a suite's target green rate and its test count into the per-test flake rate each test must meet, which is what determines how many high-level tests a team can afford to have at all.
Surrogate Key Synthetic Key concept Relational Modelling A system-generated identifier with no business meaning, used as the primary key instead of a naturally occurring business value.
Symptom-Based Alerting Alert on Effects, User-Visible Alerting concept Alert Fatigue Paging on what the user experiences and investigating causes with dashboards - because cause-based alerts fire in clusters during a single incident and bury the signal they exist to provide.
Sync Conflict Resolution concept Sync & Conflict Resolution The policy applied when the same record was changed on two devices while they were disconnected, and both changes now arrive.
Synchronous vs Asynchronous Communication concept Architecture Decision-Making Whether the caller waits for the callee's answer — decided by whether the caller's outcome depends on it, not by latency or taste.
Synchronous vs Asynchronous Replication concept Replication Whether a write is acknowledged only after a replica has it, trading write latency against the amount of data a failure can lose.
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.
System Context Boundary concept Context Diagrams The line separating what a project owns and can change from what it must integrate with and accept as given.
System of Record Authoritative Source, Golden Source concept EA Domains The single system authoritative for a business entity, from which all other copies derive - the absence of which is the dominant source of enterprise complexity.
Table Bootstrap Lag Join Side Warm-Up, Lookup State Load Time concept Streaming Joins The interval after a stream job starts during which its lookup table is only partly loaded, so enrichment lookups miss for keys that appear late in the source topic and the job emits wrong output while looking…
Tail Composition Effect Fan-Out Tail Amplification, Page-Level Tail concept Tail Latency The multiplication that turns a small per-request slow rate into a large user-visible slow rate, because a single user action makes many requests and is only as fast as its slowest one.
Tail Latency Amplification Fan-out Tail, Slowest-Component Latency concept Tail Latency A parallel fan-out completes when its slowest component does, so ordinary per-component tails combine into a much worse end-to-end tail.
Tail Latency Amplification concept Tail Latency The effect where a request that fans out to many services experiences the worst case of all of them, making rare slowness common at the user level.
Target-State Decay Architecture Plan Decay, Target Architecture Drift concept Architecture Roadmaps The rate at which an approved target architecture stops being correct - mostly for organisational reasons rather than technical ones - and the reason a plan with no review date turns into a set of case-by-case…
Team Interaction Mode concept Team Topologies The defined way two teams work together — collaborating, consuming a service, or facilitating — chosen deliberately and expected to change over time.
Team Topologies concept Team Topologies Four team types and three interaction modes, used deliberately to shape both the organisation and the architecture it produces.
Technical Constraints concept Technical Constraints The existing estate, skills, licences, contracts and platforms that bound the solution space — inputs to the design, not obstacles to it.
Technical Debt concept Software Architecture The future cost incurred by choosing an expedient implementation now instead of the better one.
Technical Debt Quadrants concept Technical Debt Distinguishing debt by whether it was taken deliberately or inadvertently, and prudently or recklessly, since the four kinds need different responses.
Technology Architecture concept Technology Architecture The platforms, infrastructure and runtimes the estate depends on — where the recurring architectural problem is obsolescence rather than choice.