In all cases, consistency within a transcription is required.

Use the grade 1 terminator when it is necessary to terminate grade 1 mode before the end of a symbols-sequence.

The guidelines relating to unknown pronunciation or syllabification apply in particular to proper names, abbreviations, acronyms, contrived words (as in science fiction) and anglicised foreign words.

When the word is unfamiliar and when the pronunciation or syllabification is unknown and difficult to ascertain, then it is permissible for contraction use to be based on the best judgment of the transcriber and/or proofreader. When translation software is being used, its contraction usage may be followed.

Grade 1 mode is also set by the numeric indicator.

When grade 1 mode is set by the numeric indicator it is terminated by a space, hyphen, dash or grade 1 terminator.

Refer to: Section 6.5, Numeric Mode.

Several contraction rules are based on the pronunciation and/or syllabification of the word. The Preference rule states that a contraction is not to be used when it would "hinder the recognition of the word". Sections 10.10.8 and 10.10.9 (the Preference rule) refer to the pronunciation of a word.
These rules represent best practices to be applied when the transcriber or proofreader is familiar with the word, when the required information about the word can be found in the text itself or when it is readily available in reference material at hand, such as a dictionary or braille word list.

For fragments of words, follow print and follow the contraction rules, 10.1 to 10.11.

Grade 1 mode is required to prevent a letter from being misread as an alphabetic wordsign.

Refer to: Section 10.1, Contractions.

For words in dialect, follow the contraction rules, 10.1 to 10.11.