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Event-driven process chain

The event-driven process chain (EPC) is a semi-formal conceptual modeling language designed for documenting, analyzing, and redesigning business processes through graphical representations that link events, functions, and logical connectors to illustrate workflow dynamics and decision points.^[1] Developed in 1992 by August-Wilhelm Scheer at the University of Saarland in Germany as a core component of the ARIS (Architecture of Integrated Information Systems) framework, EPC originated from earlier integration models like the Kölner Integrationsmodell and was formalized in collaboration with SAP for the SAP R/3 enterprise resource planning system.^[2]^[3]^[1] The SAP Reference Model, which incorporates EPC, includes over 10,000 sub-models with 604 non-trivial EPC diagrams, establishing it as a foundational tool for reference process modeling across industries such as telecommunications, manufacturing, logistics, and retail.^[1] At its core, an EPC diagram consists of events—depicting preconditions or state changes that trigger or result from processes—functions that represent the core activities or tasks performed by organizational units—and connectors such as XOR (exclusive or), OR, and AND to handle branching, merging, and synchronization in control flows.^[2]^[1] Extensions like the extended EPC (eEPC) incorporate additional elements, including organizational units, information carriers (e.g., documents or IT systems), and resource flows, enabling more detailed modeling of complex interactions.^[2] EPC supports key activities in business process management, including planning, simulation, verification of requirements, and execution monitoring, often integrated with tools like the ARIS Toolset for design and the EPC Markup Language (EPML) for model interchange.^[1]^[2] Its event-oriented structure facilitates the identification of process triggers and outcomes, making it particularly valuable for model-driven development in ERP environments and cross-organizational workflows.^[2] Despite its widespread adoption, EPC's semi-formal nature has prompted research into formal semantics and verification techniques to address ambiguities in large-scale applications.^[1]

Introduction

Definition and Purpose

The Event-driven Process Chain (EPC) is a type of flowchart-based modeling language designed for representing business processes, where processes are triggered by specific events that initiate functions or activities.^[4] In this notation, events represent states or conditions that precede or follow functions, emphasizing the dynamic, event-oriented flow of workflows rather than purely sequential structures.^[5] The primary purpose of EPC within business process management (BPM) is to facilitate the documentation, analysis, simulation, and configuration of enterprise workflows, particularly in enterprise resource planning (ERP) systems such as SAP.^[6] It enables organizations to visualize operational sequences, identify inefficiencies, and support process improvements by mapping logical dependencies and control flows.^[4] EPC models are particularly valuable for blueprinting processes that can be directly transferred to implementation tools, enhancing transparency and governance across the BPM lifecycle.^[6] Key characteristics of EPC include its semi-formal notation, which balances graphical simplicity with defined semantics for practical application, and its top-down hierarchical structure that allows decomposition into detailed sub-processes.^[7] Deeply integrated with the ARIS framework, EPC supports the incorporation of organizational, data, and risk perspectives into process models, making it suitable for comprehensive enterprise modeling.^[5] Developed primarily for business consulting and practical optimization rather than rigorous formal verification, EPC prioritizes usability in real-world scenarios over exhaustive mathematical precision.^[7]

History and Development

The Event-driven Process Chain (EPC) was developed in the early 1990s by August-Wilhelm Scheer and his team at the Institute for Information Systems (IWi) at the University of Saarland in Germany.^[4] This work emerged as part of broader efforts to create structured methods for modeling business processes in information systems.^[2] EPC was initially introduced in 1992 as a key element of the ARIS (Architecture of Integrated Information Systems) methodology, tailored to facilitate the implementation of SAP R/3 enterprise resource planning software.^[4]^[8] Scheer's foundational book, ARIS - Architecture of Integrated Information Systems: Foundations of Enterprise Modeling, published that year by Springer, outlined EPC's role in capturing process logic through events and functions, establishing it as a practical tool for enterprise modeling.^[9] During the 1990s, EPC diagrams served mainly as informal visual aids for process documentation, gaining traction through commercial tools from IDS Scheer, the company Scheer founded in 1984 to promote ARIS.^[10] By the mid-1990s, EPC had achieved widespread adoption in German industry for analyzing and configuring business processes, particularly in manufacturing and IT sectors implementing integrated systems.^[4] In the 2000s, EPC evolved from these informal representations toward formalized semantics, with significant advancements in integrating it with Petri nets to enable precise verification, simulation, and handling of concurrency.^[11]^[12] Key extensions appeared in subsequent ARIS publications, such as Scheer's works on business process frameworks, enhancing EPC's expressiveness for complex workflows.^[13] Up to 2025, ARIS standards have continued to advance, incorporating EPC into digital transformation initiatives, including automated conformance checks and conversions to BPMN for agile process management in cloud-based environments.^[14]^[15]

Components

Basic Elements

Events in an Event-driven Process Chain (EPC) diagram are represented as hexagon-shaped nodes that denote specific states or conditions within a business process, such as triggers or outcomes that indicate when a process begins or concludes.^[16] These passive elements always initiate and terminate the process chain, marking points where a particular situation holds true at a single moment in time.^[17] For instance, an event might be labeled "Order received" to signify the arrival of a customer order.^[18] Functions serve as the active components of an EPC diagram, depicted as rounded rectangles that model tasks, activities, or operations performed to advance the process.^[16] They represent transformations where inputs are converted into outputs, consuming time and resources to achieve business objectives.^[17] An example is a function labeled "Process order," which handles the review and preparation of the received order.^[18] In the extended EPC (eEPC), information and material objects are essential supporting elements in EPC diagrams, illustrated as rectangles that symbolize data carriers, documents, or physical resources involved in the process.^[16] Information objects, such as "Customer data," represent intangible items like reports or databases that provide or receive data during functions, while material objects denote tangible items like products or tools that are used or produced.^[18] These objects connect to functions to indicate inputs and outputs, clarifying resource dependencies without altering the core process flow.^[17] The logical flow in an EPC diagram follows a strict alternating sequence where events exclusively connect to functions, and functions connect to events, forming a chain that ensures clear progression from state to action and back to state.^[16] This bidirectional linkage uses directed arrows to show the direction of influence, preventing direct event-to-event or function-to-function connections in the basic structure.^[18] Visual conventions for EPC elements adhere to standards established in the ARIS framework, with events typically rendered as hexagons, functions as rounded rectangles, and objects as plain rectangles to maintain consistency across diagrams.^[16] While colors are not rigidly prescribed, common practices include green shading for events to highlight their state-based nature and yellow or white for functions to emphasize activities, aiding quick visual differentiation.^[17]

Control and Organizational Elements

In event-driven process chain (EPC) models, control connectors serve as logical operators that manage process routing by enabling splits and joins between events and functions. These connectors dictate the flow based on specific logical conditions, ensuring precise representation of decision points and parallelism. The three primary types are the exclusive OR (XOR), inclusive OR (OR), and AND operators, each with distinct behaviors for branching and merging paths.^[5] The XOR connector, symbolized as a circle containing an 'X', facilitates exclusive choices where exactly one outgoing path is activated from a split (one incoming arc to multiple outgoing arcs) or one incoming path determines activation at a join (multiple incoming arcs to one outgoing arc). This operator is essential for modeling mutually exclusive decisions, such as selecting between alternative process routes based on a single condition. For instance, in a procurement process, an XOR split might route to either "Approve Purchase" or "Reject Purchase" depending on review outcomes. In contrast, the OR connector, typically represented as a circle, allows at least one path to be chosen in splits or requires at least one incoming path for joins, supporting inclusive branching for scenarios with multiple possible continuations. The AND connector, depicted as a circle with a plus sign (+), enforces parallelism by activating all outgoing paths in splits or synchronizing all incoming paths in joins, ideal for concurrent activities like simultaneous notifications to multiple departments. These connectors establish sequence and precedence by linking events to functions or vice versa, preventing direct connections between events to maintain the event-function alternation fundamental to EPC structure.^[19]^[5] In the extended EPC (eEPC), organizational elements in EPC models assign responsibilities to process participants, integrating human and structural aspects into the flow. These include organizational units, such as departments (e.g., "Sales Department"), represented as ovals or rectangles, which denote hierarchical entities responsible for functions. Roles, grouping persons or positions, are assigned to specific functions via connections like RA(S)CI (Responsible, Accountable, Supportive, Consulted, Informed), clarifying who executes tasks without altering the core event-function sequence. For example, a "Procure Materials" function might be linked to a "Purchasing Role" within the "Logistics Unit," ensuring accountability mapping. While EPC does not use strict pools or lanes like BPMN, these assignments can be visually grouped to simulate swimlanes, aiding in resource allocation visualization.^[19]^[5] Error handling in EPC is implicitly supported through XOR connectors, which enable exception branches for alternative paths in case of failures, such as diverting to a "Handle Error" function upon detecting an issue in a main process flow. This mechanism allows modeling of contingencies without dedicated error symbols, relying on the flexibility of splits to incorporate recovery sequences while preserving overall process integrity. By combining control connectors with organizational assignments, EPC ensures that both logical flow and resource orchestration are clearly defined, facilitating analysis and implementation in business environments.^[5]

Syntax and Semantics

Connection Rules

In event-driven process chains (EPCs), the alternation rule governs the fundamental linkage between elements, requiring that events connect exclusively to functions and that functions connect only to events or control connectors. This strict sequencing ensures a logical flow where passive events trigger active functions, and functions in turn produce subsequent events, forming the core rhythm of the process model. Each function must have precisely one incoming arc and one outgoing arc, while each event can have at most one incoming arc and one outgoing arc, preventing multiple activations of passive elements. OR and XOR splits are prohibited immediately following events to maintain the passive nature of events, which cannot initiate branching decisions. Control connectors—depicted as diamonds—enforce branching and merging semantics to manage process flow. The XOR connector handles exclusive choices: at a split, exactly one outgoing path is selected based on a condition, and at a join, execution proceeds only after one incoming path completes while ensuring no other paths remain viable. The AND connector supports parallel execution: a split activates all outgoing paths simultaneously, and the corresponding join synchronizes by waiting for all incoming paths to complete. The OR connector enables conditional parallelism: a split activates one or more outgoing paths as conditions allow, and the join merges by waiting until all activated paths finish or become impossible, providing flexibility for inclusive decisions. To ensure precedence and consistency, every split connector must pair with a matching join of the same type (XOR with XOR, AND with AND, OR with OR), balancing the control flow and preventing deadlocks where processes stall indefinitely. Dangling connections, such as unmatched arcs or incomplete branches, are invalid, as they violate the closed structure starting and ending with events. Cycles consisting solely of connectors without intervening functions or events are also prohibited to avoid undefined behaviors. Hierarchical refinement allows complex functions to be decomposed into sub-EPCs, treating the sub-process as a black box that preserves the top-level logic through defined input and output events. The refinement must maintain arc consistency, with the sub-EPC's entry event aligning with the parent function's incoming arc and its exit event with the outgoing arc, without introducing alterations to the overall sequence or connector semantics. Validation criteria distinguish syntactic checks from semantic soundness. Syntactic validation verifies structural integrity, such as balanced splits and joins, adherence to the alternation rule, and absence of prohibited connections like OR/XOR splits after events. Semantic validation assesses runtime viability, ensuring no infinite loops through connector-only cycles and confirming deadlock-free execution via matched joins that resolve all active paths appropriately.

Meta-model and Formalization

The meta-model of the Event-driven process chain (EPC) defines it as a directed bipartite graph consisting of nodes representing events and functions, connected by arcs that denote control flow sequences.^[16] Events capture state changes that trigger or result from process execution, while functions represent transformations or activities; connectors such as AND, OR, and XOR operators further structure the logical branching among these nodes.^[16] This structure is formalized within the ARIS House architecture, where EPC occupies the Process View at the Requirements Definition level, integrating with Control, Function, Data, and Organization Views to provide a holistic framework for business process modeling.^[16] Formal semantics for EPC were advanced in the 1990s through mappings to Petri nets, enabling simulation and verification of process behaviors.^[20] In this mapping, Petri net places correspond to events, holding tokens to indicate marked states, while transitions align with functions that consume input event tokens and produce output ones upon firing.^[20] Introduced in extensions like those by Chen and Scheer in 1994, this approach allows analysis of concurrency, deadlock, and reachability in EPC models.^[20] The basic transition rule follows standard Petri net enabledness: a transition t is enabled if, for every input place p \in \bullet t, the marking M(p) \geq 1; upon firing, it updates the marking as M'(p) = M(p) - 1 for p \in \bullet t and M'(p') = M(p') + 1 for p' \in t \bullet, where \bullet t and t \bullet denote pre- and post-sets, respectively.^[20] The original EPC exhibits a semi-formal nature, leading to ambiguities particularly in OR connector semantics, such as the OR-join problem where synchronization requires non-local knowledge of future paths, potentially causing inconsistent executions.^[21] These issues arise from informal definitions introduced around 1992, complicating precise behavioral predictions.^[21] Post-2000 resolutions, including join OR (jOR) variants proposed by Nüttgens and Rump in 2002, address this by imposing syntactical restrictions or local rules like dead-path elimination to ensure deterministic firing without cyclic dependencies.^[21] EPC aligns with standards for interoperability, notably through the EPC Markup Language (EPML), an XML-based format for exchanging models, initially developed by Mendling and Nüttgens in 2002 and refined for tool-neutral serialization of graph elements.^[22] EPML supports hierarchical and configurable EPC variants, facilitating integration across modeling environments.^[22] Broader influences include ISO/IEC 19763-5:2015, which incorporates EPC as an exemplar in its metamodel framework for process interoperability, with ongoing relevance as of 2025 in standards for business process ontologies.^[23]

Practical Usage

Modeling Examples

A simple example of an EPC diagram models the order fulfillment process in a retail business. The process begins with the start event "Order placed," which triggers the function "Check inventory." Following this, an exclusive OR (XOR) connector branches the flow based on inventory availability: if items are in stock, the process proceeds to the function "Prepare shipment," leading to the event "Order shipped"; if not, it routes to the function "Initiate return or reorder," resulting in the event "Order returned or reordered." To incorporate parallel execution, an AND connector can split the "Prepare shipment" function into simultaneous tasks, such as "Pack items" and "Update inventory," both of which must complete before merging at the AND join to the final event "Order fulfilled." This structure ensures logical control flow while highlighting decision points and concurrent activities.^[18] For hierarchical modeling, consider refining a high-level function like "Process payment" from an order fulfillment EPC into a sub-EPC. At the top level, "Process payment" appears as a single function connected between events "Payment requested" and "Payment completed." Decomposition reveals the sub-EPC starting with the event "Payment method selected," followed by an OR connector to allow multiple paths: one for "Process credit card payment" (with sub-events "Card authorized" and function "Charge account"), another for "Process cash payment" (with event "Cash received" and function "Issue receipt"), and potentially others like "Process bank transfer." Each path converges at an OR join to the event "Payment authorized," which links back to the parent EPC. This refinement enables detailed analysis of alternatives without cluttering the high-level view.^[24] To construct an EPC diagram step by step, begin by placing the start event (e.g., a hexagon labeled "Order placed") on the canvas, followed by an arrow to the first function (rounded rectangle, "Check inventory"). Connect the function's output to an XOR connector (diamond or circle) with labeled branches for decisions, ensuring each branch leads to subsequent events or functions via arrows. For parallel branches, insert an AND connector after a function, drawing multiple outgoing arrows to parallel functions (e.g., "Pack items" and "Generate invoice"), then merge with a corresponding AND join. Object links, such as data objects or organizational roles, can be attached to functions using dashed lines for context. Finally, end with a terminal event, verifying that all paths resolve logically.^[4] Common pitfalls in EPC modeling include unbalanced connectors, such as an XOR split without a matching XOR join, which can lead to undefined process states where multiple or no paths activate unexpectedly. For instance, an XOR split after "Check inventory" branching to "Ship" and "Return" must join via an XOR to ensure only one outcome proceeds, avoiding parallel execution errors; correction involves adding the appropriate join and testing flow completeness. Another error is connecting multiple incoming arrows directly to a function without a join, violating the rule that functions have exactly one input; resolve by inserting an AND or XOR join beforehand. Adhering to these rules prevents syntactic invalidity and ensures executable models.^[25] Tools for creating EPC diagrams include the commercial ARIS platform by Software AG, which supports full hierarchical modeling and validation, and its free version, ARIS Express, suitable for basic diagrams. Online alternatives like draw.io with EPC stencil extensions also enable drawing without installation.^[4]

Applications and Benefits

Event-driven process chains (EPCs) are widely applied in enterprise resource planning (ERP) systems, particularly for configuring and documenting business processes in tools like SAP R/3 and S/4HANA.^[6]^[4] In these contexts, EPCs facilitate the modeling of operational sequences, enabling precise alignment between business requirements and system implementations.^[26] Beyond ERP, EPCs support workflow automation by visualizing event-triggered flows, which helps automate routine tasks in distributed systems.^[27] They are also instrumental in process reengineering across manufacturing and service sectors, where they aid in analyzing and redesigning workflows to enhance operational flow.^[28] In the automotive industry, EPCs have been employed in model-based design approaches to structure knowledge management and process flows, as demonstrated in studies on automotive engineering practices. For instance, EPC diagrams have been used to model the integration of functions and events in vehicle production and supply chain processes, supporting reengineering efforts.^[29] These applications have led to reported efficiency improvements, including streamlined process execution and reduced implementation times in ERP projects.^[30] EPCs offer several advantages over traditional flowchart methods, primarily due to their event-oriented structure, which makes them intuitive for non-experts in business process modeling.^[31] This accessibility allows stakeholders without deep technical knowledge to participate in process design and validation. Additionally, EPCs support simulation capabilities, enabling the identification of bottlenecks through dynamic analysis of event-function interactions.^[32] Their hierarchical nature provides scalability, permitting models to range from high-level overviews to detailed operational views without losing coherence.^[33] Despite these strengths, EPCs suffer from informal semantics, which can introduce ambiguities in complex models and limit direct execution without additional formalization.^[34] This limitation is often mitigated by verification tools, such as those integrated in ARIS, which apply reduction rules and Petri net transformations to ensure soundness and detect errors.^[35]^[36] As of 2025, a key trend involves integrating EPCs with AI-driven process mining to bridge normative models and actual process executions. Tools like ARIS Process Mining now allow direct reuse of EPC models for conformance checking against event logs, enhancing discovery and optimization through AI-enhanced analytics.^[37] This synergy supports real-time monitoring and predictive improvements in dynamic environments.

Comparisons with Other Notations

The Event-driven Process Chain (EPC) differs from Business Process Model and Notation (BPMN) primarily in its focus on high-level, conceptual modeling versus BPMN's emphasis on detailed, executable specifications. EPC employs simpler constructs like events and functions connected via logical operators, making it suitable for initial overviews in business contexts, whereas BPMN incorporates advanced elements such as gateways for complex branching, pools and lanes for organizational roles, and orchestration details that facilitate direct implementation in execution engines. This structural difference often results in information loss during EPC-to-BPMN transformations, as EPC lacks native support for certain workflow patterns like multi-instance activities. An empirical survey of process modelers indicated that while EPC is perceived as more logical and comprehensive for strategic alignment, BPMN leads to fewer modeling errors due to its standardized semantics.^[38] In contrast to Petri nets, which provide a mathematical foundation for analyzing concurrency, deadlock, and resource allocation through token-based transitions, EPC prioritizes graphical, business-oriented representations that emphasize event triggers and process flows without formal verification primitives. EPC's intuitive connector semantics aid end-users in understanding control flows like XOR splits, outperforming Petri nets in perceived ease-of-use and intention to adopt for non-technical audiences, though Petri nets excel in rigorous simulation and soundness checking. This makes EPC preferable for collaborative business modeling, while Petri nets are better suited for formal analysis in workflow verification.^[39] Compared to UML Activity Diagrams, EPC centers on event-driven workflows to capture business processes from a functional perspective, whereas UML Activity Diagrams offer broader applicability for modeling software behaviors, including object flows, signals, and pins for data handling. Experimental evaluations in requirements engineering contexts revealed that UML Activity Diagrams are rated higher in completeness and accuracy by engineers, as they support more precise behavioral specifications, but EPC facilitates quicker initial sketching for workflow overviews. EPC thus shines in event-centric requirements gathering within enterprise architecture frameworks like ARIS, contrasting BPMN's and UML's stronger orientation toward execution and software design.^[40]^[41] Hybrid approaches integrating EPC with BPMN are common in tools like SAP Signavio Process Manager, which supports both notations in a shared repository to leverage EPC for high-level design and BPMN for detailed orchestration, enabling seamless transitions without full rework.^[42]

Extensions and Variants

Reference EPCs provide standardized templates for specific industries, enabling consistent modeling of common processes. For instance, the SAP reference model utilizes EPCs to outline core business processes in areas like supply chain management, offering reusable blueprints that facilitate implementation and customization across enterprises. These templates promote interoperability and reduce modeling effort in sectors like manufacturing. Formal variants of EPC address limitations in the standard notation by incorporating advanced control flows. The extended event-driven process chain (eEPC) augments the core elements with organizational units and information carriers, allowing for more precise representation of responsibilities and data flows in complex workflows.^[30] Similarly, yet another event-driven process chain (yEPC) introduces multiple instantiation parameters and cancellation constructs to support dynamic patterns like deferred choices and parallel routing, enhancing compatibility with business rules engines for automated execution.^[43] These variants enable probabilistic branching through parameterized functions, improving formal verification in time-sensitive applications.^[43] Tool-specific extensions expand EPC functionality within modeling environments. In ARIS, simulation modules integrate with EPC diagrams to evaluate process performance, generating statistics on throughput times, resource utilization, and bottlenecks without requiring external software.^[44] The extended process chain (EPK) variant in ARIS further adds value chain elements, linking processes to organizational resources for holistic analysis.^[45] Semantic enhancements post-2010 focus on resolving ambiguities in standard EPC, particularly with OR connectors. Sound EPCs enforce a soundness property ensuring proper termination without deadlocks or livelocks, achieved by mapping to Petri nets and excluding ambiguous OR-joins in favor of explicit synchronization rules.^[11] This formalization, building on earlier work, provides polynomial-time verification and clearer join semantics, supporting reliable integration with ontology-based tools for enhanced process interoperability.^[46] As of 2025, future directions include AI-augmented EPC for dynamic processes, where agentic AI systems leverage event-driven structures to automate adaptations in real-time workflows, such as optimizing supply chains through predictive event triggering.^[47]

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EPC vs. UML Activity Diagram - Two Experiments Examining their ...
The authors found evidence that activity diagrams performed better than EPCs from a requirements engineer's perspective. ... ...
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BPMN 2.0 for Efficient Process Design - SAP Signavio
In fact, Signavio fully supports all modeling languages–from Business Process Model & Notation BPMN 2.0, to event-driven process chain (EPC) and ArchiMate® 2.1, ...
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Event-Driven Process Chains (EPC) - LinkedIn
Nov 10, 2022 · This article provides a comprehensive overview of Event-driven Process Chains (EPCs) and introduces a novel definition of EPC semantics.Missing: original paper
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Structural Patterns for Soundness of Business Process Models
We identify three kinds of error patterns that affect the soundness of a process model, namely the deadlock pattern, the multiple termination pattern, and the ...
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[PDF] Yet Another Event-Driven Process Chain (Extended Version)
After a survey on related work (Section 5), we give a conclusion and an outlook on future research (Section 6). 2 Yet Another Event-Driven Process Chain (yEPC).
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ARIS Simulation
ARIS Simulation is an extension for ARIS Enterprise. No additional software is required, and there are no imports or exports. Simulate EPC or BPMN™ models. With ...
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[PDF] Meta-Model based Extensions of the EPC for Inter ... - CEUR-WS
the ARIS framework, especially the ARIS House by SCHEER [Sc02c], an EPC model integrates the different views or perspectives on entrepreneurial entities. It ...
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(PDF) Semantic EPC: Enhancing Process Modeling Using Ontology ...
Jul 20, 2015 · PDF | In this article we describe a semantic extension of event-driven process chains, with which it is possible to specify the semantics of ...Missing: enhancements | Show results with:enhancements
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With an Event-driven SIPOC model to transparent Agentic AI
Jan 18, 2025 · EPCs can serve as a framework to design, visualize and manage the behavior of Agentic AI systems, helping to define their responses to events, ...