computer science

Table Producing Language

Table Producing Language 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 Table Producing Language rather than just read about it. In short: Table Producing Language (TPL) was an IBM mainframe program, developed by the US Bureau of Labor Statistics (BLS), for producing statistical tables. It has been superseded by the commercial product TPL Tables developed by QQQ Software.

Key takeaways

Table Producing Language 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 Table Producing Language to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Table Producing Language from memory before moving on to harder problems.

Reference excerpt

Table Producing Language (TPL) was an IBM mainframe program, developed by the US Bureau of Labor Statistics (BLS), for producing statistical tables. It has been superseded by the commercial product TPL Tables developed by QQQ Software.

Overview The development of TPL was initiated by BLS in the early 1970s and firstly was presented publically at Assosisation for Computer Machinery (ACM) Annual Conference, in 1974. The language initially was designed by Richard Heddinger and Pamela Weeks under the direction of Peter Stevens, a Chief of the Division of General Systems, and curated by Rudolph C. Mendelssohn, an Assistant Commissioner.

History The TPL development started by BLS, in the early 1970s, with a study of the full range of tables. Its goals were a system able to produce most Bureau tables, driven by a language that did not require computer science training, and output fit for printing. TPL was presented at the 1974 ACM Annual Conference. By 1975, BLS ran TPL on IBM 360/65, 370/165, and 370/168 machines under OS/MVT. For outside users (non-BLS-internal versions) TPL machines ran on the 360/50, 370/155, and 370/158. The software was distributed on tape in object code. The system was built with the XPL compiler generator, which includes a dialect of PL/1. Within one year, the core of the system was in experimental production at BLS. TPL version of 3.1 was tested and operated on IBM 360/65 mainframe, which enabled it to process around 2,000 variables for a single table, to handle any fixed-length formats and to have no limits on tables amount being operated. Further TPL was adopted in other organizations. The Law Enforcement Assistance Administration (LEAA) Research Support Center integrated it into Michigan Terminal System. The Energy Information Administration used it to produce statistical tables. A 1981 article described its use for library reports. In 1982, United Nations review of survey data processing covered it. BLS issued later versions, such Version 4.0 in 1978, and a Language Guide with a Print Control Language. TPL influenced later software - SAS PROC TABULATE was based on it. The rtables framework cites TPL as a precedent for declarative tabulation.

References

External links QQQ Software

Worked examples

Example 1 — a first encounter with Table Producing Language

Start with the simplest possible case. Write down what Table Producing Language 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 Table Producing Language 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 Table Producing Language 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 Table Producing Language

In research: Table Producing Language 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 Table Producing Language 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: Table Producing Language is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer programming stubs, IBM mainframe software, Statistical software, so understanding it makes those chapters shorter.
In everyday life: Look for Table Producing Language 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 Table Producing Language in 20 minutes

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

Frequently asked questions

What is Table Producing Language in simple terms?

Why does Table Producing Language 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 Table Producing Language?

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 Table Producing Language.