MIL-DTL-23618H(AS)
b. Arrangement. Arrangement of information in procedural step format vice narrative
descriptive material also enhances comprehension. Text and illustrations shall be closely
coordinated.
c. Graphic data. Graphic data is of equal importance to text. Simple, clear graphics reduce
text requirement and raise the level of comprehension.
d. Typeface and type size. Text typeface and typesize are controlling factors of legibility. It
is preferred that a serif typeface (e.g., Times Roman, Courier, Prestige, Schoolbook) be
used for text and tabular data. Leading (vertical line spacing) and kerning (horizontal
character spacing) shall be such that clear, legible text is produced. For the purposes of
this specification, unless otherwise specified (see 6.2.1), normal (after reduction) size type
shall be used for text and text on illustrations and checklists. Type size for the title and
phase cover cards shall be in accordance with 3.3.1 or 3.3.2. For the purposes of this
specification, the following nominal type sizes shall mean the corresponding measured
sizes:
Nominal size
Allowable measured size (points)
small
6-1/2 to 8-1/2
normal
8-1/2 to 9-1/2
large
13-1/2 to 14-1/2
3.1.5.1.2 Readability. Readability is measured using criteria based on the reader's ability to
comprehend and retain the written information. To ensure that text material is both readable and
comprehensive, the overall writing style shall be directed toward specific standards that will
guarantee accomplishment of these objectives. Controlling factors include word length, sentence
length, paragraphing, and word usage. Prepared text shall conform to the following readability
standards:
a. Word length. The length of a word is measured by its number of syllables. Simple
common words of a few syllables shall be used to convey the intended meaning. The
average word length shall not exceed 1.60 syllables. The desired average word length is 1
to 1.5 syllables, but 1.51 to 1.60 is acceptable. Military terms and mandatory technical
words are excluded from this restriction.
b. Sentence length. Sentences should be short and concise in order to facilitate ease of
understanding and retention of thought. The average sentence length shall not exceed 20
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