computer science

Language of Temporal Ordering Specification

Language of Temporal Ordering Specification is a computer 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 Language of Temporal Ordering Specification rather than just read about it. In short: In computer science Language of Temporal Ordering Specification (LOTOS) is a formal specification language based on temporal ordering of events. LOTOS is used for communications protocol specification in International Organization for Standardization (ISO) Open Systems Interconnection model (OSI) standards.

Key takeaways

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

Reference excerpt

In computer science Language of Temporal Ordering Specification (LOTOS) is a formal specification language based on temporal ordering of events. LOTOS is used for communications protocol specification in International Organization for Standardization (ISO) Open Systems Interconnection model (OSI) standards. LOTOS is an algebraic language that consists of two parts: a part for the description of data and operations, based on abstract data types, and a part for the description of concurrent processes, based on process calculus. Work on the standard was completed in 1988, and it was published as ISO 8807 in 1989. Between 1993 and 2001, an ISO committee worked to define a revised version of the LOTOS standard, which was published in 2001 as E-LOTOS.

See also Formal methods List of ISO standards CADP E-LOTOS Process calculus

References ISO/IEC international standard 8807:1989. Information Processing Systems - Open Systems Interconnection - LOTOS: A Formal Description Technique based on the Temporal Ordering of Observational Behaviour. Geneva, September 1989. The Formal Description Technique LOTOS, P.H.J. van Eijk et al., editors, North-Holland, 1989. LOTOSphere: Software Development with LOTOS, Tommaso Bolognesi, Jeroen van de Lagemaat, and Chris Vissers, editors, Kluwer Academic Publishers, 1995. Hubert Garavel, Frédéric Lang, and Wendelin Serwe, From LOTOS to LNT. In Joost-Pieter Katoen, Rom Langerak, and Arend Rensink, editors, ModelEd, TestEd, TrustEd - Essays Dedicated to Ed Brinksma on the Occasion of His 60th Birthday, vol. 10500 of Lecture Notes in Computer Science, pages 3–26, Springer International Publishing, October 2017, doi 10.1007/978-3-319-68270-9_1.

External links World-wide Environment for Learning LOTOS (WELL) Tutorials for LOTOS (see section 3) LOTOS in the RKBExplorer

Worked examples

Example 1 — a first encounter with Language of Temporal Ordering Specification

Start with the simplest possible case. Write down what Language of Temporal Ordering Specification claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer 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 Language of Temporal Ordering Specification 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 Language of Temporal Ordering Specification 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 Language of Temporal Ordering Specification

In research: Language of Temporal Ordering Specification appears in computer 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 Language of Temporal Ordering Specification 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: Language of Temporal Ordering Specification is common in secondary-school and first-year university syllabi. It links to neighbouring topics Concurrency (computer science), Concurrency control, Formal methods, so understanding it makes those chapters shorter.
In everyday life: Look for Language of Temporal Ordering Specification 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 Language of Temporal Ordering Specification in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Language of Temporal Ordering Specification 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 Language of Temporal Ordering Specification out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Language of Temporal Ordering Specification in simple terms?

Why does Language of Temporal Ordering Specification matter?

Because it connects several computer 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 Language of Temporal Ordering Specification?

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 Language of Temporal Ordering Specification.