science

Just-in-time blocking

Just-in-time blocking 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 Just-in-time blocking rather than just read about it. In short: Just-in-time blocking is the practice of temporarily blocking internet access for people in a specific geographic area, to prevent them from accessing information or communicating with each other. The first known instance of just-in-time blocking was documented by the OpenNet Initiative during the 2005 Kyrgyz parliamentary elections.

Key takeaways

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

Reference excerpt

Just-in-time blocking is the practice of temporarily blocking internet access for people in a specific geographic area, to prevent them from accessing information or communicating with each other. The first known instance of just-in-time blocking was documented by the OpenNet Initiative during the 2005 Kyrgyz parliamentary elections. It's also been observed during the 2006 Belarus presidential elections, the 2006 Tajik presidential elections, and is alleged to have taken place in Bahrain, Uganda, and Yemen, during their 2006 presidential and parliamentary elections. In 2016, internet watchdog organization Turkey Blocks identified two separate regional internet shutdowns commencing prior to the arrests of mayors in predominantly Kurdish southeast of Turkey, a measure believed to have been implemented by the government to prevent protests and limit critical media coverage. In the two-week period leading up to the 2013 Iranian presidential elections, anti-censorship groups Herdict and ASL19 found access to popular websites such as Facebook, Meyar News, Twitter, the BBC and YouTube was intermittently blocked in Iran. Mohammad Hassan Nami, then Iran's Minister of Communications and Information Technology, told Tasnim News Agency that the restrictions were part of “security measures taken to preserve calm in the country during the election period."

References

Worked examples

Example 1 — a first encounter with Just-in-time blocking

Start with the simplest possible case. Write down what Just-in-time blocking 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 Just-in-time blocking 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 Just-in-time blocking 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 Just-in-time blocking

In research: Just-in-time blocking 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 Just-in-time blocking 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: Just-in-time blocking is common in secondary-school and first-year university syllabi. It links to neighbouring topics Access control, Internet censorship, Internet stubs, so understanding it makes those chapters shorter.
In everyday life: Look for Just-in-time blocking 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.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Just-in-time blocking” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Just-in-time blocking in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Just-in-time blocking 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 Just-in-time blocking out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Just-in-time blocking in simple terms?

Why does Just-in-time blocking 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 Just-in-time blocking?

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 Just-in-time blocking.