Simplify the creation and management of your safety, security, assurance, and compliance cases with our ASCE software.
What is ASCE?
ASCE is a specialist assurance case software designed for organisations that need to build and demonstrate confidence in complex systems. It provides a structured environment for developing, managing, and maintaining assurance arguments supported by evidence, helping teams address safety, security, resilience, compliance, environmental, and operational concerns throughout the system lifecycle.
Why ASCE?
Traditional approaches to developing and maintaining assurance cases can be highly complex, lengthy and expensive. ASCE makes the management of assurance information and demonstration of regulatory compliance easier, more efficient and more cost effective, helping you move faster with confidence.
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Build clear, defensible arguments using structured case patterns and visual notations.
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Keep cases “living” with change control across narrative, structure, and evidence.
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Improve traceability and audit readiness with evidence linking and custom reporting.
- Collaborate efficiently with tailored stakeholder views, shared task tracking, and in-context comments.
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Improve efficiency at scale by reusing proven case structures to accelerate updates and reduce manual rework.
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Reduce project risk by spotting assurance gaps early and resolving issues sooner - preventing approval delays that can stall progress.
ASCE supports assurance‑driven resilience activities across multiple domains - especially where rigour, traceability, and auditability matter.
Perfect for:
Whatever your domain, make assurance clearer,
faster to review, and easier to maintain over time.
See how ASCE supports your use case in practice.
Native support for the most commonly used assurance case notations
ASCE supports a diverse range of graphical notations and diagrams, including CAE, GSN, Bow Tie, Fault Tree, and more.
CAE
Claims Arguments Evidence (CAE) is a powerful framework for structuring and communicating the trustworthiness of complex systems across safety, security and wider system concerns. Co‑developed by Adelard and the City St George’s University of London, CAE has become one of the most widely used notations for assurance case development due to its clear, user‑friendly visual structure and its ability to support rigorous, defensible reasoning.
ASCE includes several CAE schemas, including the latest ASCAD 2.0. This modernised schema aligns with the Assurance 2.0 framework, enabling users to tackle emerging assurance challenges - particularly those introduced by autonomous systems and AI‑driven machine learning behaviour. With ASCE, teams can build CAE arguments that stay current, scalable and robust as systems evolve.
GSN
ASCE offers full support for Goal Structuring Notation (GSN) Version 3, the latest GSN community standard. Beyond the core concepts, elements, relationships and extensions, ASCE enhances GSN diagram development with a range of additional features such as notes, extended node properties, decorators and more - making it easier to build clear, maintainable and well‑structured assurance arguments at scale.
Our Modular GSN plugin extends this even further. It delivers full support for Modular Extensions, along with automation tools that update architectural views and manage references between modules. This modular approach enables new configurations to be created without reworking entire safety cases, helping organisations manage large, complex assurance structures in a scalable, efficient and future‑proof way.
Bow Tie analysis
ASCE includes Bow Tie schemas and a wide variety of helpful example networks, making it easy to build clear and structured models of threats, controls, and potential consequences. By integrating Bow Tie risk models directly into the wider assurance case, ASCE allows organisations to move beyond static risk diagrams - giving teams a dynamic and auditable view of how threats are mitigated and where vulnerabilities may still exist, as well as how those vulnerabilities interact with and impact the rest of the system.
Structured graphical representation, rich narrative, connected evidence, and seamless change control brought together into one place - so you can build trust, maintain traceability, and stay audit‑ready as your system evolves.
Bring structure and story together in your case
Comprehensive assurance case creation
Add rich narrative
Developing assurance cases in critical industries requires more than just diagrams – it demands clear, compelling rationale and narrative. With ASCE, you can do build visual arguments and enrich each element with narrative content underpinned by evidence.
Comprehensive assurance case creation
Get clarity at a glance
ASCE offers descriptions for notational elements and their relationships, enabling easier assurance case creation.
Not all arguments are weighted equally. Highlight what matters most by assigning link strength, so critical reasoning is easy to spot and review.
Comprehensive assurance case creation
Validate your structure
Automated checks validate your CAE/GSN structure against defined rules, giving instant, actionable feedback, so your case stays robust and aligned with best practice.
Collaborate in a way that fits your team
Collaboration made easy
Create meaningful user views
Create stakeholder‑specific views so teams can focus on what’s relevant to them, without losing the integrity of the whole case.
Collaboration made easy
Seamlessly assign and track tasks
Flag gaps, request evidence, and assign actions, with clear task ownership and progress visibility across the team.
Collaboration made easy
Add context where it matters
Capture comments and responses directly in the case so review decisions remain traceable, reviewable, and preserved for future audits.
Keep your case aligned with every change
Seamless document management
Maintain a single source of truth
Centralise and connect evidence from documents, spreadsheets, databases, other assurance cases, and more - keeping knowledge intact across team changes and ensuring continuity throughout the project lifecycle.
Seamless document management
Keep your narrative truly dynamic
Use Dynamic Narrative Regions (DNRs) to add the exact paragraphs, tables, or sections you need from source documents into your case - so your narrative stays current as evidence evolves, without manual rework.
Seamless document management
See every change in your case
Stay informed and in control of every update with effortlessly generated comprehensive summary showing what’s changed across evidence, narrative, and structure, and choose which updates to approve.
Build regulatory readiness efficiently and confidently
Efficient case review and progress tracking
Quickly identify the gaps
Use traffic‑light confidence indicators to instantly see which parts of the case have been successfully developed and where further effort and evidence is needed. Streamline progress tracking, informed decision-making, and efficient resources allocation to the most pressing areas.
Streamlined reporting
Simplify report preparation
Generate custom, production‑quality reports in minutes in Word, PDF, or interactive HTML formats. Whether you’re preparing reports for engineers, auditors, regulators, or senior stakeholders, ASCE helps you deliver clear, well‑structured outputs faster and with far less effort.
Regulatory approval submission
Get audit-ready faster
Access all assurance data easily in ASCE to eliminate manual searching and speed up reviews and compliance checks. When it’s time to prepare for audit, ASCE Resource Manager bundles your entire assurance case and supporting evidence.
What our ASCE customers say
“ A versatile, comprehensive, easy to use software package which can be used for the simplest to the most complex safety case.” - Compliance Manager, MoD
"Assists us in audits by showing weak areas and by collating all proof into one place. Holds our corporate knowledge - It doesn’t matter if someone is off sick or leaves without handover, it’s all in here.” - Compliance Manager, High Risk Industrial Site
“Just what was required for managing the complexity of large scale safety cases and safety management systems.” - Safety Manager, Aerospace
ASCE in action
Flexible licensing to fit your team
ASCE fits into different teams and use cases with multiple licensing options. We are here to help with the most effective setup based on your needs.