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Use sentence-case capitalization for all UI text elements. This style is predominantly lowercase. Capitalize only the initial letter of the first word in the text and other words that require capitalization, such as proper nouns. For example, labels in a form would be written as “First name” and “Email address”.

The image below shows a page title, tabs, a module title, link text, button text, table headers, and table content all following the sentence case rule.

Sentence-style capitalization makes it easy for readers to distinguish between common nouns and proper nouns, and is generally considered the quickest form to read.

Carbon does not consider UI elements within a product to be proper nouns. Nor does Carbon support a concept of “important words” or “specialness”. Determining whether something is important or special is highly subjective and can result in inconsistencies across an organization.

Unless the name is a product or service name, or is trademarked, always use sentence-style capitalization.

In the following examples, the capitalization shows that Padlock, Visual Recognition, and IBM Cloud are either products or services.

When writing about a UI element, use the same capitalization as used in the UI. For example, if an input field is labeled “Name” then you refer to this as the Name input field. Similarly, if a drop-down menu has the label “Country” next to it, then it is correct to refer to the Country drop-down menu. Where a product page is titled “My network,” you refer to this in writing as follows: “Enter your network information in the My network page.”

Capital letters are reserved for the following:

If it’s not in the list above, it should not be capitalized.

Sometimes official company and product names use non-standard capitalization. If you refer to any of these, ensure you write them accurately. Here are some examples (all written correctly):

Title (or headline) case capitalization is where the first letter of most words is capitalized, but not articles, conjunctions, or prepositions (except if any of these are the first or last word in the sentence or phrase).

Title case is difficult to implement consistently across an organization because:

Title case can also slow reading and comprehension down as it is more difficult for readers to distinguish between proper nouns and common nouns.

All caps (or uppercase) capitalization is where every letter is capitalized.

All caps capitalization has been shown to be slower to read (especially when text is more than a few words) as individual letter shapes are less distinguishable from each other—they are the same height and have no ascenders or descenders. This style also typically requires more space in the UI per letter than sentence case does.

In addition, it can be difficult for the reader to distinguish between proper nouns and common nouns. In the first example below, it’s easy to distinguish product names from features whereas it takes longer to make these distinctions when the text is in all caps.

The names of people, places, and products are proper nouns and therefore all take initial capitals. Examples of proper nouns are:

There are many words that can act as either a common noun or a proper noun, depending on the context. So, you always need to think about how the word is being used. Here are some examples:

IBM product and service names

When referencing the name of any IBM product, use the official (full) name, not an abbreviation or just the product name initials, unless a shortened name has been specifically approved, as with IBM CICS.

Use all uppercase letters for well-recognized abbreviations. This applies to both initialisms, such as IBM, and to acronyms, such as GIF.

If there’s a chance that an abbreviation might not be known to the target audience, it’s good practice to spell it out in full the first time you use it. However, don’t spell out commonly known abbreviations, for example PDF, CEO, AM/PM.

Unless the word begins a sentence, phrase, or UI element name, don’t give it a capital letter.

Don’t give a word a capital letter to denote “specialness”. If you want to emphasize a particular word or phrase within a sentence, use italic or bold formatting (but not both).

The active voice is direct and punchy, and emphasizes the subject of the sentence. The subject clearly “acts upon” the verb (hence, “active”). For example, “John ate the apple”. In situations where either voice will work, generally choose the active voice for more directness.

The passive voice, on the other hand, flips the construction so that the subject is secondary to the verb and object (hence, “passive”). Often, the subject is not even included in the sentence. For example, “The apple was eaten by John” or just “The apple was eaten”. Only sentences that contain direct objects can be constructed in the passive voice. Thus, “John ate” cannot be constructed passively.

The passive voice makes for a more natural tone in certain use cases. For example, if the true subject of the sentence is a system, and the human is secondary, passive voice can be acceptable.

Engage your readers by using second person (you, your) where appropriate. First person (I, we, our) focuses on the writer rather than the audience, which is rarely appropriate in UI or technical contexts. Avoid the first person unless you have a compelling reason to use it.

One exception to this is in the case of possessive adjectives in the UI. You can use first person in headings or labels that are very specific to the user or customer data, such as “My Account” or “My Usage”. In explanatory text for the heading or label, however, use second person. For example, “Your usage is calculated from the first day of the month”.

While a more formal tone is often appropriate for technical and business writing, a more casual tone is becoming increasingly accepted (and expected) in UI and supporting materials.

Often overused, these terms can convey the wrong tone for technical material, and are not regarded the same way in all cultures. Use terms such as “please” and “thank you” carefully.

These terms are often misused. Remember, “can” implies ability, and “may” implies permission (and sometimes uncertainty).

These terms can also be confusing. Remember, when either “may” or “might” will work, generally go with “might” to avoid confusion with the multiple meanings of “may”.

Eric Radzinski, Leslie McDonald, Amy Laird, Jana Jenkins, Peter Hayward, and Francis DeRespinis, The IBM Style Guide: Conventions for Writers and Editors, (IBM Press, 2011)

Tom Waterton, How to emphasize key words in your text, (Medium, 2017)