System architecture
The blueprint of your IBM i: subsystems, partitions, environments, and how they relate to the business functions they carry.
Architecture diagram set, editable source included
IBM AS400 Documentation Services
The people who built your AS400 estate are retiring.
Know what every program actually does
Map and document hidden code relationships, dependencies, and legacy logic.
We help you document what they know before they go
15+
Years of AS400 Expertise
24/7
Customer Support
USA HQ
Serving Clients Globally
0
Skilled Engineers
ISO Certified
Security & Quality Standards
Why is this urgent?
Your system will outlast the people who understand it
IBM supports IBM i until 2035, so the system is not going anywhere. The people who know how it works are a different story. Most shops expect to lose them around 2030, which leaves about five years running a system nobody remembers building.
Your experts are still here
Now until about 2030
The people who built and maintained your system are still on the payroll. This is the only window in which you can ask them anything.
About 5 years without them
About 2030 to 2035
The system still runs and IBM still supports it. But when something breaks or needs changing, nobody left in the building knows why it was built that way.
What We Document
Our IBM i AS400 documentation services
Functional overview
What the system does, department by department, so a non-RPG reader can navigate it without a translator.
Functional map and narrative overview
Component inventory
Every library, object, and program in scope, split into what is live, what is dormant, and what is dead.
Searchable inventory in Excel and Confluence
IT policies and procedures
The operational framework around the system: standards, controls, and the procedures your auditors will ask for.
Policy pack aligned to your audit scope
Which Documentation Zone Is Your IBM i In?
Align your future efforts depending on the current level of AS400 documentation
The Danger Zone
Lack of proper documentation for IBMi systems can create chaos for businesses. Without it, planning system upgrades and training new team members can turn into a nightmare. Ensure smooth operations and seamless transitions with thorough IBMi system documentation.
0% – 40%
The Moderate Zone
At this point, various users and tech members lack a full understanding of the system's functionality. It's crucial for companies to invest in some effort in consistently documenting their systems across all programs.
40% – 80%
The Safe Zone
Businesses that prioritize documentation best practices make sure their systems are well-documented across multiple levels, ensuring clarity and accessibility for all users.
80% – 100%
Engagement
How the Work Actually Runs
A four-stage AS400 documentation engagement designed to give you visibility early. Each stage has a clear timeframe and a defined deliverable, so you start seeing useful output within weeks, not months.
1
Discovery Call
We start by understanding the shape of your IBM i estate: program volumes, libraries, source availability, documentation gaps, and what your team actually needs documented.
2
Estate Scan and Fixed-Scope Proposal
We run automated analysis across a representative portion of the estate to understand its size and complexity. This helps identify highly interconnected programs, unused or redundant code, and areas likely to require deeper documentation.
3
Documentation Build
Your AS400 documentation is delivered in fortnightly increments rather than held until the end of the engagement.
Your team reviews each release as the work progresses, giving us the opportunity to validate business logic, correct assumptions, and refine the documentation while the relevant code is still being analyzed.
4
Handover and Maintenance
Once complete, the documentation is delivered into the system your team already uses, whether that is Confluence, SharePoint, Git, or another agreed repository.
From there, we can maintain the documentation as the application changes under an ongoing engagement or complete the handover so your internal team can manage it independently.
AI-Accelerated Documentation
Explore AI for AS400
Where AI Makes AS400 Documentation Faster
AI helps us analyze large IBM i estates faster, generate first-draft documentation at scale, and give engineers a stronger starting point for validation.
01
Program Understanding
AI reads RPG, CL, and COBOL source and turns complex program logic into clear, plain-English summaries.
02
Estate-Wide Analysis
AI analyses large volumes of source code in parallel, making it practical to document more of the AS400 estate at once.
03
Business Rule Extraction
AI identifies calculations, conditions, thresholds, exceptions, and other business rules embedded in the code.
04
Data Dictionary Creation
AI traces how files and fields are used and helps translate technical names into meaningful business descriptions.
05
Codebase Questioning
AI helps locate where calculations happen, which programs update a file, and what depends on a specific program.
06
Consistent Documentation
AI applies a consistent structure and level of detail across program summaries, business rules, dependencies, and data definitions.
What Our Clients Say
Trusted by product teams and enterprises running on IBM i.
See How Our Clients Regained Control of Their AS400 Systems
Here's how we helped teams document critical IBM i knowledge, prepare for compliance requirements, and plan modernization with a clearer view of their systems.
Why Your Peers Trust Us
We combine deep IBM i expertise, dedicated delivery capacity, and AI-assisted analysis to document systems faster without removing engineering oversight.
iBistro
25,000+ IBM i Issues Resolved
Years of working with IBM i environments help us spot the logic, dependencies, workarounds, and edge cases that source code alone does not always explain.
250+ Engineers
We can analyze and document multiple parts of the estate in parallel, keeping delivery moving without depending on one or two overstretched resources.
15+ Years Across RPG, CL, DDS, and Db2
The engineers validating your documentation understand legacy IBM i patterns, so unusual logic is investigated in context rather than misread or oversimplified.
Every Artefact Engineer-Reviewed
AI accelerates code analysis and first-draft documentation. Experienced engineers review and validate every artefact before it reaches your team.
Free consultation
What Else We Can Help You With
Your IBM i environment rarely needs just one kind of support. Beyond documentation, we help with modernization, automation, cloud, data, integration, and ongoing AS400 operations.
Frequently Asked Questions
Our latest publications
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