science

GRAI method

GRAI method is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand GRAI method rather than just read about it. In short: The GRAI method, GRAI is short for Graphs with Results and Actions Inter-related, and the further developed GRAI Integrated Methodology (GIM) is a modeling method of Enterprise modelling. The GRAI method was first proposed by Guy Doumeingts in his 1984 PhD thesis, entitled La Méthode GRAI, further developed at the GRAI/LAP (Laboratory of Automation and Productics) of University Bordeaux, and followed by GRAI/GIM by…

Key takeaways

GRAI method belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect GRAI method to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of GRAI method from memory before moving on to harder problems.

Reference excerpt

The GRAI method, GRAI is short for Graphs with Results and Actions Inter-related, and the further developed GRAI Integrated Methodology (GIM) is a modeling method of Enterprise modelling. The GRAI method was first proposed by Guy Doumeingts in his 1984 PhD thesis, entitled La Méthode GRAI, further developed at the GRAI/LAP (Laboratory of Automation and Productics) of University Bordeaux, and followed by GRAI/GIM by Doumeingts and others in 1992. The GRAI method can represent and analyze the operation of all or part of a production activity. The strength of the GRAI method lies in its ability to provide modelers can effectively model the decision-making system of the company, i.e. organizational processes that generate decisions. In the GRAI methodology four types of views had been incorporated: the functional view, physical view, decisional view and informational systems view.

References

Further reading Chen, D., and G. Doumeingts. "The GRAI-GIM reference model, architecture and methodology." Architectures for Enterprise Integration. Springer US, 1996. 102-126. Chen, David, Bruno Vallespir, and Guy Doumeingts. "GRAI integrated methodology and its mapping onto generic enterprise reference architecture and methodology." Computers in industry 33.2 (1997): 387-394. Doumeingts, Guy, Bruno Vallespir, and David Chen. "GRAI grid decisional modelling." Handbook on architectures of information systems. Springer Berlin Heidelberg, 1998. 313-337. Doumeingts, Guy. "How to decentralize decisions through GRAI model in production management." Computers in Industry 6.6 (1985): 501-514. Girard, Philippe, and Guy Doumeingts. "GRAI-Engineering: a method to model, design and run engineering design departments." International Journal of Computer Integrated Manufacturing 17.8 (2004): 716-732.

External links The GRAI Method Part 1: global modelling by B. Vallespir, G. Doumeingts The GRAI method Part 2: detailed modeling and methodological issues by B. Vallespir, G. Doumeingts

Worked examples

Example 1 — a first encounter with GRAI method

Start with the simplest possible case. Write down what GRAI method claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to GRAI method before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about GRAI method ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of GRAI method

In research: GRAI method appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses GRAI method in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: GRAI method is common in secondary-school and first-year university syllabi. It links to neighbouring topics Enterprise modelling, so understanding it makes those chapters shorter.
In everyday life: Look for GRAI method outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study GRAI method in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what GRAI method means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain GRAI method out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is GRAI method in simple terms?

Why does GRAI method matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study GRAI method?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on GRAI method.