Short, simple sentences are easier to read and understand. Sentences should be simple declarative statements. Style also means passive or active voice. Active voice is when the subject of the sentence acts, but if the subject is acted on, the voice is passive. Passive voice nearly always takes more words and is less direct.
Active voice takes fewer words and is more direct.
Active voice is preferred in most cases, but is not always appropriate. Avoid the use of abbreviations unless they are well-known industry standards or are defined in the specification. Avoid the use of symbols. Use numerals consistently and set particular rules for capitalization. Set rules for spelling and select a particular dictionary for specification production.