What is an index and do you need one? | Editor Group (2024)

Want to know former US president Bill Clinton’s thoughts on the Watergate scandal? The 1993 World Trade Center bombing? Monica Lewinsky? There’s no need to read all 957 pages of his autobiography,My Life. Simply flick to the back of the book and check the index for the page number.

An index is a list of all the names, subjects and ideas in a piece of written work, designed to help readers quickly find where they are discussed in the text. Usually found at the end of the text, an index doesn’t just list the content (that’s what a table of contents is for), it analyses it.

Where are indexes used?

In addition to back-of-the-book indexes found in non-fiction books and technical reports, indexes are also used to make other sources of information – including journal articles, maps and atlases, art collections, online databases and websites – easier to navigate. Where books are published online, in PDF or e-book format, indexes link directly to points in the text.

Indexes are a common inclusion in many annual reports and are mandatory for annual reports produced by Australian Government departments, executive agencies and other non-corporate Commonwealth agencies.

What makes a good index?

An index provides a map to a report’s content. It does this through identifying key themes and ideas, grouping similar concepts, cross-referencing information and using clear formatting. A good index will:

  • be arranged in alphabetical order
  • include accurate page references that lead to useful information on a topic
  • avoid listing every use of a word reor phrase
  • be consistent across similar topics
  • use sub-categories to break up long blocks of page numbers
  • use italics for publications and Acts
  • cross-reference information to point to other headings of interest or preferred terms.

For example, a back-of-the-book index might read:

sales, sales process, 147, 149, 158,see alsostrategy(directs the reader to a related term)

scripts, 56–59(grouping term)

podcasts, 56–57(sub-term)

video, 58–59

search engine optimisation, 100, 156

Security Analysis(David Dodd and Benjamin Graham), 89–90(reference to a book)

spelling,seeproofreading(directs the reader to the word or phrase used in the text)

While software is available to help indexers arrange, format and edit entries, indexers will also use their judgement when deciding what to put into an index, what to leave out and how to organise it.

Don’t forget to add a table of contents

A good index may be the difference between people referring to a report regularly and it gathering dust on the bookshelf. If you don’t have an index, it’s important to at least have a good table of contents.

Located at the front of a report, a table of contents allows readers to easily see what the report is about and how sections of the text are arranged, in the order they appear.

A good table of contents will include headings, outlining the main sections or themes; sub-headings that indicate what each section of copy is about; and the page numbers they appear on. Additional content such as tables and boxes can also be added.

Want to make your report as easy to navigate as possible? Bookend it with a table of contents and an index – readers will have no excuse for not being able to find the information they’re after.

We can help create a roadmap for your reports, books and other larger documents. Learn more aboutindexingorcontact us here.

Read more:

How to create an award-winning annual report

What is an index and do you need one? | Editor Group (2024)

FAQs

What is an index and do you need one? | Editor Group? ›

An index is a list of all the names, subjects and ideas in a piece of written work, designed to help readers quickly find where they are discussed in the text. Usually found at the end of the text, an index doesn't just list the content (that's what a table of contents is for), it analyses it.

What is the index used for? ›

An index is an alphabetical list with page numbers that refer to all the major topics in a book. It is found at the back of the book and can be helpful if the reader is researching information. Like an index finger, it points the reader to certain information.

Why do we need an index? ›

The primary role of index numbers is to simplify otherwise complicated comparisons. It is especially useful when comparing currencies that have lots of different nominal values. Some countries even use index numbers to modify public policy, such as adjusting government benefits for inflation.

Does group by need an index? ›

The most efficient way to process GROUP BY is when an index is used to directly retrieve the grouping columns. With this access method, MySQL uses the property of some index types that the keys are ordered (for example, BTREE ).

What is an index in a book used for? ›

An index is essentially a roadmap to the book, listing names, places, and things in alphabetical order and giving the page numbers associated with each topic. For nonfiction books, packed with valuable information, a well-made index can help quickly direct the reader to the information they're trying to find.

Why do people use index? ›

An index gives a quick measure of the state of a market. Index funds are a low-cost way to invest, provide better returns than most fund managers, and help investors to achieve their goals more consistently.

What is an example of an index? ›

In other words, an index is a statistically representative sampling of any set of observable securities in a given market segment. For instance, the well-known S&P 500 is a representation of the large-cap segment of the U.S. equity market.

What is the purpose of creating an index? ›

Indexing makes columns faster to query by creating pointers to where data is stored within a database. Imagine you want to find a piece of information that is within a large database. To get this information out of the database the computer will look through every row until it finds it.

What is the main advantage of using indexes? ›

It helps us find the rows or the values to be searched faster. They have various advantages like increased performance in searching for records, sorting records, grouping records, or maintaining a unique column.

When should we use index? ›

Indexes prevent duplicate entries in the column or combination of columns on which it is created. Since SQL indexes are primarily a performance tool, they are most useful when a database grows in size. The clustered index is one of the most popular types of indexes supported by SQL server.

What is index in a group? ›

In mathematics, specifically group theory, the index of a subgroup H in a group G is the number of left cosets of H in G, or equivalently, the number of right cosets of H in G.

When should you not create an index? ›

When Should Indexes Be Avoided?
  1. Indexes should not be used on small tables.
  2. Indexes should not be used on columns that return a high percentage of data rows when used as a filter condition in a query's WHERE clause. ...
  3. Tables that have frequent, large batch update jobs run can be indexed.

What should be included in an index? ›

An index is a list of all the names, subjects and ideas in a piece of written work, designed to help readers quickly find where they are discussed in the text. Usually found at the end of the text, an index doesn't just list the content (that's what a table of contents is for), it analyses it.

Do all books need an index? ›

If your book is fiction, then you won't need an index. That's because indexes are, at their most basic, navigation devices. While a work of fiction is read from front to back, non-fiction are often used as reference works where the reader will be wanting to find a specific piece of information on a specific topic.

What is the importance of an index? ›

It can be used to track the performance of a group of assets in a standardized way. Indexes typically measure the performance of a basket of securities intended to replicate a certain area of the market.

Who writes the index of a book? ›

Most indexing is done by freelancers hired by authors, publishers or an independent business which manages the production of a book, publishers or book packagers. Some publishers and database companies employ indexers. Before indexing software existed, indexes were created using slips of paper or, later, index cards.

What is the index method used for? ›

Index method involves multiplying an original construction cost by a multiplier that is reached based on the margin of increase in construction costs since a property was built. This method is often used as an indicator for specific building costs associated with a particular property.

What is the function index used for? ›

The INDEX function returns a value or the reference to a value from within a table or range. There are two ways to use the INDEX function: If you want to return the value of a specified cell or array of cells, see Array form. If you want to return a reference to specified cells, see Reference form.

What does the index tell you? ›

An index measures the price performance of a basket of securities using a standardized metric and methodology. Indexes in financial markets are often used as benchmarks to evaluate an investment's performance against.

What is an index used to determine? ›

An index is used as a benchmark to track the performance of a specific set of securities and compare the returns generated by a mutual fund, portfolio manager, etc. Index ETF funds are used to invest in a specific list of securities tracked by the index.

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