RFLP & Systems Engineering
Mastering complex systems – from requirements to realization
The RFLP methodology (Requirements – Functional – Logical – Physical) forms the methodological backbone of modern systems development. It creates an end-to-end development path where every design decision can be traced from stakeholder requirements through to physical implementation.
As an experienced systems engineer, I help organizations introduce and effectively implement this methodology in practice – regardless of industry or domain.
What is RFLP?
RFLP structures systems development into four successive levels:
Requirements (R) – What should the system accomplish? Stakeholder needs are translated into structured, verifiable requirements. Each requirement receives a unique identifier and is accompanied by acceptance criteria.
Functional (F) – Which functions are needed? The necessary system functions are derived from the requirements – solution-neutral and technology-independent. Functional decomposition, use cases, and activity diagrams describe what the system must do, without specifying how.
Logical (L) – How do the components work together? The logical architecture defines abstract building blocks, their interfaces, and data flows. This is where the interplay of system components takes shape – without committing to specific technologies or components.
Physical (P) – Which concrete components do we use? The physical level assigns real hardware, software, or mechanical components to the logical building blocks. Bills of materials, CAD models, and schematics are the result.
The key value: End-to-end traceability. Every design decision can be traced across all four levels. When a requirement changes, it is immediately visible which functions, logical building blocks, and physical components are affected.
My Consulting Approach
Lightweight, adaptable tools instead of monolithic toolchains
Systems engineering practice shows that many projects fail not due to a lack of methodology, but because of bloated, rigid tools that create more administrative overhead than development progress. My approach deliberately takes a different path.
Under the project name SE-Master, I am developing a web-based systems engineering workbench built on the following principles:
Text-based modeling with FlowSpec – A purpose-built, Markdown-like Domain-Specific Language (DSL) enables system architectures to be described in readable text form. Logical functions, data flows, component hierarchies, interfaces, and network topologies are captured in a unified, extensible syntax. The result: models that are versionable, comparable, and machine-readable – without proprietary binary formats.
User-defined type systems – FlowSpec allows users to define domain-specific types. Whether signal types in vehicle electronics, sensor classes in medical technology, or data formats in industrial automation – the language adapts to the context, not the other way around.
Open, web-based architecture – SE-Master is built on TypeScript, React, and modern open-source technologies. Models are created and visualized via a web frontend, are versionable through Git, and support team collaboration.
Why this approach?
Traditional SE tools often come with high adoption costs, require expensive licenses, and lock organizations into single vendors. For many projects – especially outside of large automotive OEMs – this is neither economical nor necessary.
The combination of text-based modeling and web-based visualization offers a pragmatic middle ground: methodologically sound according to RFLP, yet lean enough to deliver immediate value even in smaller teams and projects.
Service Portfolio
- Methodology consulting & introduction – Building an RFLP-based development process, tailored to your domain and team size. From requirements structuring to traceability strategy.
- Tooling & tool selection – Vendor-neutral consulting on the selection and configuration of SE tools. Assessment of whether established MBSE tools, lightweight Markdown-based approaches, or hybrid solutions best fit your context.
- Custom solutions – Development of tailored SE tools and workflows based on open technologies. From simple model viewers for existing architecture data to integrated modeling environments.
- Coaching & training – Hands-on training for systems engineering teams. Teaching the RFLP methodology using concrete project examples, complemented by practical exercises with the chosen tools.
Industries
My expertise is applicable across domains. The RFLP methodology delivers value wherever complex technical systems are developed – whether medical technology, industrial automation, building technology, or mechanical engineering.