The method
Seven published rules, free, under a Creative Commons licence. You can use them without any software.
Groma · Simon G.
Simon G. proposes a company's everyday decisions; a named person approves them.
It runs on your own infrastructure, and sending data outside stays the exception that needs a signature.
01 Three ways in
Three ways in, one discipline.
You can start anywhere: with the written method, a browser tool, or the platform installed at your company.
The free tools
They run in your browser. Your file never leaves your computer.
The platform
It installs on the company's servers and runs the same calculation every night, with approval from a named person.
02 Free tools
Four tools to start with.
Each one runs in your browser. The file is never uploaded anywhere.
Ready to use · free
Simon G. Stock Check
Stock and orderingLoad your opening stock and transactions. You get the demand forecast, reorder point, order proposal and excess stock for every product. It takes a few minutes. The file never leaves your computer.
groma.ro/en/simon-g/stock-check Ready to use · freeSimon G. Working Capital Check
Working capitalEnter a few figures from your balance sheet. You get the cash tied up in stock and receivables, explained on one page. It takes a few minutes. The figures never leave your computer.
groma.ro/en/simon-g/working-capital Ready to use · freeSimon G. Credit Check
Trade creditLoad a list of invoices. You get, for every customer, how well and how late they pay. It takes a few minutes. The list never leaves your computer.
groma.ro/en/simon-g/credit-check Ready to use · freeSimon G. Decision Charter
GovernanceFill in your decision classes, owners and limits, following the method's six columns. You get one page: who may decide what. It takes a few minutes. Your data stays on your computer.
groma.ro/en/simon-g/decision-charterFree Excel templates: safety stock and reorder point cash conversion cycle and working capital days
Without a network: the four tools in one file a note for your IT department
03 Method
Seven rules for decisions that machines propose.
The Simon G. Method is published by Groma under a Creative Commons Attribution 4.0 licence, and it is free.
- 1
Every class of decision has a named owner
List the decisions that matter: a dozen or two, not hundreds. Put one person’s name beside each. A committee is not a name.
- 2
Every freedom given to a machine has a signed limit
For each class, write what the machine may do alone and where it must stop and ask. The limit is a number or a condition, signed by the owner, with a review date.
- 3
Every proposal carries its evidence
A proposal states what is true now, what is proposed, the reasoning, the expected effect in money, and which inputs were missing. A proposal that cannot show its reasoning is not approved.
Missing information is stated as missing. It is never replaced silently with a zero or a default.
- 4
A person signs
Inside the limit, the machine may act and the record says so. Outside it, a named person approves or rejects, and gives a reason when rejecting.
- 5
The record cannot be rewritten
Decisions are added to the record and never edited or deleted. A correction is a new entry that points to the old one. This holds for administrators too.
- 6
The effect is measured against a baseline fixed beforehand
Before a decision is applied, write down the figure it is meant to change and its current value. Afterwards, measure the same figure the same way.
A result without a baseline proves nothing, in either direction.
- 7
Data and models stay inside a perimeter the company controls
Decide where data may be processed and which models may see it. Local processing is the default, and sending data out is the exception that needs a signature.
Four levels
| Level | Name | What exists | Effort to reach |
|---|---|---|---|
| 1 | Written | The charter and the perimeter statement | An afternoon |
| 2 | Recorded | Decision records are kept, even in a spreadsheet | Two to four weeks |
| 3 | Measured | Baselines are fixed and outcomes verified | One quarter |
| 4 | Enforced | The system refuses what the charter does not allow, and the record cannot be altered | Software |
The full method, with its three documents · The public repository of the method (GitHub)
04 The platform
What the platform adds beyond the free tools.
- It runs the same calculation every night, on the company's own server.
- It proposes safety stock and transfers across several locations, not just one warehouse.
- Every proposal reaches a named person, under a signed limit.
- Once recorded, a decision can no longer be rewritten.
- The effect of each decision is measured afterwards, against a baseline fixed beforehand.
- It installs on your company's own infrastructure; there is no cloud service behind it.
The modules
| Module | What it proposes | Who typically decides |
|---|---|---|
| Stock | The demand forecast, how much to order per supplier, and where safety stock should sit in the network. | Head of supply chain or planner |
| Pricing | The list price, inside the signed corridor, and discount leakage. | Commercial director |
| Credit | The risk class and credit limit for each customer. | Credit controller |
| Finance | Duplicate payments, leakage from payment terms, missed discounts and unallocated cash. | Head of finance or CFO |
| Logistics | Supply planning and supplier performance, without a score or a ranking. | Planner or head of supply chain |
| Knowledge | Internal documents ranked by authority, with mandatory sourcing and contradictions flagged. | The role responsible for each directive |
| Investment | Net present value, internal rate of return and payback period, computed deterministically. | The owner named in the company's decision charter |
The platform is in pilot.
05 What Simon G. is not
Five things it does not do.
- It does not execute anything. It proposes, and a named person decides.
- It does not replace the ERP. It runs above the systems you already use.
- It is not a chatbot. An assistant may explain a proposal the engine already made; it does not decide or invent new proposals.
- It does not send company data to a cloud model. There is no cloud service behind it.
- It does not make a company compliant by itself. It produces the evidence several rules ask for.
06 Who it is for
Four starting points, by your role.
CEO or owner
You want to know, at any time, who decided what and with what effect.
Start with the method: seven rules, one afternoon.CFO
You have cash tied up in stock and receivables, and you do not know exactly how much.
Start with the Working Capital Check.Head of supply chain
You do not know exactly what to order and what stock is excess.
Start with the Stock Check.CIO
Teams already use AI tools, without a signed limit.
Start with the Decision Charter: the IT rows are already in the template.07 Contact
Write to us about your company.
Write to us if you want to implement Simon G. in your company.
08 Questions
Frequently asked questions
Where does my data go?
The free tools run in your browser; the file is never uploaded anywhere. The platform installs on your company’s own servers.
What do the free tools cost?
Nothing.
What does the platform need to start?
A few exports from your ERP, following templates we give you. It never asks for access or passwords to your systems.
How long does it take to start?
The installation takes a few minutes. What takes time is preparing the exports from your systems, and that differs from one company to another.
Does it replace the ERP?
No. It runs above it and never writes back to it.
How does it relate to AI assistants?
The engine proposes the decision; an assistant may explain the reasoning. The assistant does not decide or invent proposals.