ISO Standard Structure

Questions and Answers

What is the correct way to represent a value less than 1 in decimal form?

0.001 (correct)

001.

.001 (correct)

001

Which symbol should be used to indicate multiplication of numbers and numerical values?

x (correct)

How should numbers of items be expressed in a standard?

Using a combination of arabic and roman numerals

Using arabic numerals

Spelling out the numerals in full (correct)

Using roman numerals

Which system of units should be used in a standard?

International System of Units (SI) Signup and view all the answers

What is the purpose of undated references in a standard?

To include all future changes of the referred document Signup and view all the answers

How should numerical values of physical quantities be expressed in a standard?

Using arabic numerals followed by the international symbol for the unit Signup and view all the answers

What is the correct way to make dated references to a standard?

… in accordance with PAES 301: ____ … Signup and view all the answers

Why are undated references used in a standard?

To refer to a complete document or a part thereof Signup and view all the answers

How can the elements that form a standard be classified?

By their normative/informative nature and their position within the structure Signup and view all the answers

What type of element is the Foreword?

Informative preliminary element Signup and view all the answers

What is the purpose of the Table of contents?

To provide generated content Signup and view all the answers

What is the purpose of using arabic numbers in parentheses in a standard?

To facilitate cross-reference to formulae Signup and view all the answers

How should dimensions and tolerances be indicated in a standard?

In an unambiguous manner Signup and view all the answers

What type of element is the Normative reference(s)?

Normative general element Signup and view all the answers

What is the difference between Normative technical elements and Informative supplementary elements?

One is informative and the other is normative Signup and view all the answers

What is the correct way to express a range of percentages?

63% to 67% Signup and view all the answers

What type of element is the Title page?

Required element Signup and view all the answers

What is the symbol for the damping coefficient in the given example?

δ Signup and view all the answers

What is the purpose of the Introduction?

To provide background information Signup and view all the answers

How should the numbering of formulae in annexes be done?

Consecutively, independent of the numbering of clauses, tables and figures Signup and view all the answers

What is the correct way to express a center value with tolerance?

(65 ± 2) % Signup and view all the answers

What is the purpose of the Normative annex?

To provide requirements Signup and view all the answers

What is the purpose of the Informative annex?

To provide supplementary information Signup and view all the answers

What is the purpose of annex E in the standard?

To provide additional guidance on expressing tolerances on percentages Signup and view all the answers

What is the unit of measurement in the example '80 mm x 25 mm x 50 mm'?

Millimeters Signup and view all the answers

What type of content can be included in the Informative annex?

Only informative elements Signup and view all the answers

What is the primary purpose of defining concepts in a standard?

To clarify any term that is not self-explanatory or commonly known Signup and view all the answers

What should be avoided in terminology standards?

Use of trade names and archaic terms Signup and view all the answers

What happens to deprecated terms in a standard?

They are indicated as deprecated after the preferred term Signup and view all the answers

What is the recommended approach for defining concepts used in multiple standards?

Define the concept in an independent terminology standard Signup and view all the answers

What type of standard may include a 'Terms and definitions' clause?

Standard that deals with other aspects Signup and view all the answers

Why should common dictionary terms be included in a standard?

To clarify their specific meaning in the relevant context Signup and view all the answers

What should be checked before establishing a term and definition for a concept?

That no other term and definition for the concept exist in another standard Signup and view all the answers

What is the scope of concepts defined in an independent terminology standard?

Restricted to the field corresponding to the scope of the standard Signup and view all the answers

What is the verbal form used for statements of possibility and capability?

can and cannot Signup and view all the answers

What is the correct way to write units and symbols?

Write, for example, either 'kilometer per hour' or 'km/h' Signup and view all the answers

What should be done when combining numerical values with unit symbols?

Use a space between the numerical value and the unit symbol Signup and view all the answers

What is the recommended way to subdivide the degree?

Subdivide the degree decimally Signup and view all the answers

What should be avoided when using unit symbols?

Modifying internationally standardized unit symbols Signup and view all the answers

What is the correct way to write 'seconds'?

s Signup and view all the answers

What is the correct way to write 'cubic centimeters'?

cm3 Signup and view all the answers

What is the correct way to write 'liters'?

l Signup and view all the answers

Study Notes

Subdivision of the Subject Matter within an Individual Standard

A standard can be classified into elements in two ways: by their normative/informative nature and position within the structure, and by their required or optional presence.
The elements of a standard can be arranged in a typical structure, which includes:
- Title page
- Table of contents
- Foreword
- Informative preliminary elements (e.g., Introduction, Scope, Normative reference)
- Normative general and technical elements (e.g., Requirements, Normative annex)
- Informative supplementary elements (e.g., Informative annex, Bibliography, Index)

Forms of References

References to other standards should be made in a specific format, e.g., “… carry out the tests given in PAES 226:200…” or “… in accordance with PAES 301: ____, clause 3, …”.
Undated references may be made only to a complete document or a part thereof, and only in specific cases, such as if it is accepted that it will be possible to use all future changes of the document referred to.

Representation of Numbers and Numerical Values

When writing values less than 1 in decimal form, the decimal sign should be preceded by a zero, e.g., 0.001.
The symbol x should be used to indicate multiplication of numbers and numerical values, e.g., 1.8 x 10-3.
When expressing numbers of items, the numerals one to nine should be spelt out in full, e.g., “Carry out the test on five tubes, each 5 m long.”
When expressing values of physical quantities, arabic numerals followed by the international symbol for the unit should be used, e.g., 5 m.

Quantities, Units, Symbols, and Signs

The International System of units (SI) should be used, as set out in ISO 31.
Dimensions and tolerances should be indicated in an unambiguous manner, e.g., 80 mm x 25 mm x 50 mm.
Tolerances on percentages should be expressed in a mathematically correct form, e.g., “from 63 % to 67 %” or “(65 ± 2) %”.

Numbering of Formulae

If necessary, formulae should be numbered in order to facilitate cross-reference, using arabic numbers in parentheses, beginning with 1.
The numbering should be consecutive and independent of the numbering of clauses, tables, and figures.

Drafting and Presentation of Terms and Definitions

Terminology may take the form of an independent terminology standard or be included in a “Terms and definitions” clause in a standard.
Terms and definitions should be chosen to clarify concepts that are not self-explanatory or commonly known, and to avoid ambiguities.
Common dictionary or current technical terms should be included only if they are used with a specific meaning in the relevant context.

Checklist Concerning Quantities and Units

Do not mix symbols and names of units.
Combine numerical values written in figures with unit symbols, e.g., “5 m”.
Avoid using non-standardized abbreviated terms of units.
Internationally standardized unit symbols should not be modified by adding subscripts or other information.

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Description

Quiz on the subdivision of subject matter within an individual standard, including normative and informative elements, and their required or optional presence.