{"id":4403,"date":"2026-01-19T11:46:34","date_gmt":"2026-01-19T03:46:34","guid":{"rendered":"https:\/\/guides.visual-paradigm.com\/tw\/docs\/mastering-uml-2-5-a-use-case-driven-approach-to-agile-modeling\/module-4-the-heartbeat-the-7-behavioral-uml-diagrams\/timing-diagrams\/"},"modified":"2026-01-26T15:33:18","modified_gmt":"2026-01-26T07:33:18","slug":"timing-diagrams","status":"publish","type":"docs","link":"https:\/\/guides.visual-paradigm.com\/tw\/docs\/mastering-uml-2-5-a-use-case-driven-approach-to-agile-modeling\/module-4-the-heartbeat-the-7-behavioral-uml-diagrams\/timing-diagrams\/","title":{"rendered":"Timing Diagrams"},"content":{"rendered":"<p dir=\"auto\"><strong>Focusing on time constraints and state changes over a specific timeline.<\/strong><\/p>\n<figure id=\"attachment_5143\" aria-describedby=\"caption-attachment-5143\" style=\"width: 805px\" class=\"wp-caption alignnone\"><img fetchpriority=\"high\" decoding=\"async\" class=\"size-full wp-image-5143\" src=\"https:\/\/guides.visual-paradigm.com\/tw\/wp-content\/uploads\/sites\/3\/2026\/01\/inspection-uml-timing-diagram-example.png\" alt=\"Inspection UML timing diagram example\" width=\"805\" height=\"579\" srcset=\"https:\/\/guides.visual-paradigm.com\/tw\/wp-content\/uploads\/sites\/3\/2026\/01\/inspection-uml-timing-diagram-example.png 805w, https:\/\/guides.visual-paradigm.com\/tw\/wp-content\/uploads\/sites\/3\/2026\/01\/inspection-uml-timing-diagram-example-300x216.png 300w, https:\/\/guides.visual-paradigm.com\/tw\/wp-content\/uploads\/sites\/3\/2026\/01\/inspection-uml-timing-diagram-example-768x552.png 768w, https:\/\/guides.visual-paradigm.com\/tw\/wp-content\/uploads\/sites\/3\/2026\/01\/inspection-uml-timing-diagram-example-150x108.png 150w\" sizes=\"(max-width: 805px) 100vw, 805px\" \/><figcaption id=\"caption-attachment-5143\" class=\"wp-caption-text\">Inspection UML timing diagram example<\/figcaption><\/figure>\n<p dir=\"auto\"><strong>Timing diagrams<\/strong> in <a href=\"https:\/\/guides.visual-paradigm.com\/docs\/mastering-uml-2-5-a-use-case-driven-approach-to-agile-modeling\/module-1-foundations-of-agile-modeling-with-uml-2-5\/uml-2-5-overview\/\">UML 2.5<\/a> are specialized behavioral diagrams designed to model <strong>precise temporal aspects<\/strong> of system behavior\u2014particularly <strong>state changes<\/strong>, <strong>value changes<\/strong>, or <strong>condition durations<\/strong> over a continuous or discrete <strong>timeline<\/strong>. Unlike sequence diagrams (which show discrete message ordering) or state machines (which focus on event-triggered transitions), timing diagrams emphasize <strong>time<\/strong> as the primary axis: how long states persist, when transitions must occur, deadlines, periods, jitter, response times, and timing constraints.<\/p>\n<p dir=\"auto\">Key elements of timing diagrams:<\/p>\n<ul dir=\"auto\">\n<li><strong>Lifeline<\/strong> \u2014 Horizontal line for each participant (object, role, component, system, or signal).<\/li>\n<li><strong>Timeline<\/strong> \u2014 Horizontal axis representing time (continuous or discrete ticks).<\/li>\n<li><strong>State\/Condition Timeline<\/strong> \u2014 Thick line segment showing duration of a state or value (e.g., solid for \u201cHeating\u201d, dashed for \u201cIdle\u201d).<\/li>\n<li><strong>Transition<\/strong> \u2014 Vertical line or slanted arrow between state changes, labeled with <strong>event<\/strong> or <strong>trigger<\/strong>.<\/li>\n<li><strong>Time Constraint<\/strong> \u2014 {duration} notation (e.g., {t \u2264 50ms}, {response &lt; 200ms}, {period = 1s \u00b1 10ms}).<\/li>\n<li><strong>Duration Constraint<\/strong> \u2014 Between two points on timeline, e.g., {d} or {min..max}.<\/li>\n<li><strong>Time Mark<\/strong> \u2014 Vertical dashed line labeled t0, t1, etc., for reference points.<\/li>\n<li><strong>Value Change<\/strong> \u2014 Can show variable values over time (e.g., temperature rising from 20\u00b0C to 25\u00b0C).<\/li>\n<li><strong>Compact vs. Robust<\/strong> notation \u2014 Compact (state line with changes) or robust (explicit state regions).<\/li>\n<\/ul>\n<p dir=\"auto\">Timing diagrams are especially valuable in:<\/p>\n<ul dir=\"auto\">\n<li>Real-time and embedded systems<\/li>\n<li>Performance-critical applications<\/li>\n<li>Protocols with strict timing<\/li>\n<li>Hardware-software co-design<\/li>\n<li>Systems with QoS requirements (latency, throughput, jitter)<\/li>\n<li>Validating SLAs or regulatory timing rules<\/li>\n<\/ul>\n<p dir=\"auto\">In Agile &amp; use-case-driven projects, they are used sparingly but powerfully\u2014typically for high-risk timing aspects identified during use case elaboration or architectural spikes.<\/p>\n<h3 dir=\"auto\">Practical Examples of Timing Diagrams in Real Projects<\/h3>\n<p dir=\"auto\">Here are numerous concrete examples showing timing diagrams modeling time-sensitive behavior:<\/p>\n<ul dir=\"auto\">\n<li><strong>E-commerce \u2013 Payment Gateway Response Time SLA<\/strong>\n<ul dir=\"auto\">\n<li>Lifelines: :CustomerApp, :PaymentService, :ExternalGateway Timeline: t0 = payment request sent<\/li>\n<li>CustomerApp: Processing (t0 to t0+500ms)<\/li>\n<li>PaymentService: Authorizing (t0 to t0+200ms) \u2192 WaitingForGateway (t0+200ms to t0+800ms)<\/li>\n<li>ExternalGateway: Idle \u2192 Processing (t0+300ms to t0+700ms) \u2192 Approved Constraints: {response time \u2264 1000ms} from t0 to approval {gateway latency \u2264 500ms} Practical benefit: Visualizes end-to-end latency budget; used to set timeouts and retry policies.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Mobile Banking \u2013 Transaction Authorization Timeout<\/strong>\n<ul dir=\"auto\">\n<li>Lifelines: :MobileApp, :AuthService, :CoreBanking Timeline: t0 = transfer initiated<\/li>\n<li>MobileApp: AwaitingOTP (t0 to t0+120s)<\/li>\n<li>AuthService: OTPGenerated \u2192 OTPValid (t0 to t0+300s)<\/li>\n<li>CoreBanking: Pending \u2192 Executed (only if OTP validated within 60s) Constraint: {OTP validity = 120s} Transition at t0+60s: [no OTP entered] \u2192 Timeout \/ cancelTransaction() Practical: Ensures security window is enforced; helps test timeout edge cases.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Ride-Sharing \u2013 ETA Calculation &amp; Real-Time Updates<\/strong>\n<ul dir=\"auto\">\n<li>Lifelines: :DriverApp, :MatchingService, :RiderApp Timeline: t0 = ride accepted<\/li>\n<li>DriverApp: EnRoute (t0 \u2192 t_end) with periodic location updates every 5s \u00b1 1s<\/li>\n<li>MatchingService: CalculatingETA (t0 to t0+2s) \u2192 StableETA (t0+2s onward)<\/li>\n<li>RiderApp: ShowingETA (updates every 10s) Constraint: {ETA refresh \u2264 10s} {jitter \u2264 2s} Practical: Exposes acceptable delay for user experience; guides WebSocket heartbeat frequency.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Healthcare \u2013 Defibrillator Response in Cardiac Arrest<\/strong>\n<ul dir=\"auto\">\n<li>Lifelines: :MonitorDevice, :Defibrillator, :Patient Timeline: t0 = arrhythmia detected<\/li>\n<li>MonitorDevice: Monitoring \u2192 ShockAdvisory (t0 to t0+5s)<\/li>\n<li>Defibrillator: Standby \u2192 Charging (t0+5s to t0+8s) \u2192 ReadyToShock<\/li>\n<li>Patient: Fibrillating \u2192 NormalRhythm (after shock at t0+10s \u00b1 2s) Constraint: {time to shock \u2264 10s} {charge time \u2264 3s} Practical: Critical for device certification (IEC 60601); used in safety analysis.<\/li>\n<\/ul>\n<\/li>\n<li><strong>IoT Smart Thermostat \u2013 Temperature Control Loop<\/strong>\n<ul dir=\"auto\">\n<li>Lifelines: :ThermostatController, :TemperatureSensor, :Heater Timeline: t = continuous<\/li>\n<li>TemperatureSensor: Reading (oscillating 19\u201321\u00b0C)<\/li>\n<li>ThermostatController: Idle \u2192 Heating (when temp &lt; 20\u00b0C \u2013 0.5\u00b0C hysteresis)<\/li>\n<li>Heater: Off \u2192 On (duration until temp \u2265 21\u00b0C) Constraint: {overshoot \u2264 1\u00b0C} {settling time \u2264 5min} {cycle period \u2248 10min} Practical: Models PID-like control loop timing; validates energy efficiency claims.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Real-Time Stock Trading \u2013 Order Matching Latency<\/strong>\n<ul dir=\"auto\">\n<li>Lifelines: :TraderGateway, :MatchingEngine, :MarketDataPublisher Timeline: t0 = order arrives<\/li>\n<li>TraderGateway: Received \u2192 Forwarded (t0 to t0+2ms)<\/li>\n<li>MatchingEngine: Queued \u2192 Matching (t0+2ms to t0+5ms) \u2192 Executed<\/li>\n<li>MarketDataPublisher: UpdateSent (within t0+10ms) Constraint: {end-to-end matching \u2264 5ms} {market data update \u2264 10ms} Practical: Regulatory requirement visualization; used in performance budgeting.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Automotive \u2013 Adaptive Cruise Control Reaction<\/strong>\n<ul dir=\"auto\">\n<li>Lifelines: :RadarSensor, :ACCController, :ThrottleActuator, :BrakeActuator Timeline: t0 = lead vehicle slows<\/li>\n<li>RadarSensor: Detecting \u2192 RangeDecreasing<\/li>\n<li>ACCController: Maintaining \u2192 Decelerating (t0+50ms)<\/li>\n<li>ThrottleActuator: Open \u2192 Closing (t0+100ms)<\/li>\n<li>BrakeActuator: Inactive \u2192 LightBraking (t0+200ms if needed) Constraint: {reaction time \u2264 200ms} {deceleration ramp \u2264 3m\/s\u00b2} Practical: ISO 26262 safety timing analysis; shows coordinated actuator response.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Embedded Device \u2013 Watchdog Timer Reset<\/strong>\n<ul dir=\"auto\">\n<li>Lifelines: :Application, :WatchdogTimer Timeline: t = continuous<\/li>\n<li>Application: Running \u2192 Stalled (if no kick within 500ms)<\/li>\n<li>WatchdogTimer: Armed \u2192 Timeout (after 500ms) \u2192 ResetSystem Constraint: {kick interval \u2264 400ms} {tolerance \u00b150ms} Practical: Ensures system recovery from hangs; critical for reliability in field devices.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p dir=\"auto\">In Visual Paradigm:<\/p>\n<ul dir=\"auto\">\n<li>Create horizontal lifelines and drag state\/condition segments.<\/li>\n<li>Add time constraints with curly braces {\u2026}.<\/li>\n<li>Use compact mode for simple state changes or robust for detailed durations.<\/li>\n<li>Annotate with time marks (t0, t1) and duration markers.<\/li>\n<li>Simulate timing to verify constraints.<\/li>\n<li>Semantic backplane links timing constraints to state machines, sequence messages, or requirements.<\/li>\n<\/ul>\n<p dir=\"auto\">Timing diagrams are the <strong>precision instrument<\/strong> for time-critical behavior\u2014making deadlines, latencies, periods, and jitter explicit and verifiable. They complete the set of 7 behavioral diagrams, equipping you to model both high-level orchestration and microsecond-level timing constraints.<\/p>\n<p dir=\"auto\">With the heartbeat of behavior fully covered, you&#8217;re ready for <a href=\"https:\/\/guides.visual-paradigm.com\/docs\/mastering-uml-2-5-a-use-case-driven-approach-to-agile-modeling\/module-5-agile-architecture-and-implementation-workflows\/\"><strong>Module 5: Agile Architecture and Implementation Workflows<\/strong><\/a>, where we connect everything to code, patterns, and iterative delivery.<\/p>\n","protected":false},"featured_media":0,"parent":4388,"menu_order":5,"comment_status":"open","ping_status":"closed","template":"","meta":{"_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_eb_attr":"","neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":""},"doc_tag":[],"class_list":["post-4403","docs","type-docs","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Timing Diagrams - Visual Paradigm Guides Traditional Chinese<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/guides.visual-paradigm.com\/tw\/docs\/mastering-uml-2-5-a-use-case-driven-approach-to-agile-modeling\/module-4-the-heartbeat-the-7-behavioral-uml-diagrams\/timing-diagrams\/\" \/>\n<meta property=\"og:locale\" content=\"zh_TW\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Timing Diagrams - Visual Paradigm Guides Traditional Chinese\" \/>\n<meta property=\"og:description\" content=\"Focusing on time constraints and state changes over a specific timeline. Timing diagrams in UML 2.5 are specialized behavioral diagrams designed to model precise temporal aspects of system behavior\u2014particularly state changes, value changes, or condition durations over a continuous or discrete timeline. Unlike sequence diagrams (which show discrete message ordering) or state machines (which focus on event-triggered transitions), timing diagrams emphasize time as the primary axis: how long states persist, when transitions must occur, deadlines, periods, jitter, response times, and timing constraints. Key elements of timing diagrams: Lifeline \u2014 Horizontal line for each participant (object, role, component, system, or signal). Timeline \u2014 Horizontal axis representing time (continuous or discrete ticks). State\/Condition Timeline \u2014 Thick line segment showing duration of a state or value (e.g., solid for \u201cHeating\u201d, dashed for \u201cIdle\u201d). 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