Write in the Active Voice

Unless you have a good reason to do otherwise, always choose the active, rather than the passive, voice. With the active voice, the agent (the person or thing carrying out the action expressed by the verb) is the subject:

John opened the door.

There are two types of passive voice constructions. In one, the agent is identified, but the person or thing toward which the action is directed (rather than the agent) is the subject of the sentence:

The door was opened by John.

In the second type of passive voice construction, the agent is not identified at all:

The door was opened.

(Note: The verb "to be" [am, is, are, was, were, be, being, been] often flags the passive voice.)

In addition to being less natural, less direct, and less vigorous, sentences that fail to identify an agent can raise ethical questions, since they fail to attribute responsibility for the action they express. The passive voice can, however, be an effective means of doing at least three things:

a. Focusing attention on the thing acted upon:

The bus was destroyed by a freight train.

b. Describing action when the agent is unknown or unimportant:

The building was demolished over fifteen years ago.

c. Placing the agent at the end of a clause where he, she, or it can more easily be modified by a long modifier:

The house was built by John Hanson, who went on, years later, to become president of the Continental Congress.

Many science and technical writers once considered passive voice more objective than active voice and, hence, more appropriate to their writing. As the quotations below suggest, however, the traditional preference for passive voice in scientific and technical writing is changing:

We cannot object to this use of the passive construction in itself. We can object to its abuse —to use almost to the exclusion of all other constructions. When the passive is used as a rule, not as an exception to obtain a particular effect, writing soon begins to seem forced and uncomfortable.

— John Kirkman, Good Style: Writing for Science and Technology

The active is the natural voice, the one in which people usually speak or write, and its use is less likely to lead to wordiness or ambiguity. The passive of modesty, a device of writers who shun the first-person singular, should be avoided. I discovered is shorter and less likely to be ambiguous than it was discovered. The use of I or we...avoids dangling participles, common in sentences written in the third-person passive.

— Council of Biology Editors, CBE Style Manual, 5^th ed.

[Passive voice] implies that events take place without any one doing anything. Moves files, desks, and ideas without any assistance from a human being. Makes readers wonder whether they should be doing something or just sitting there waiting for the system to perform. It turns actions into states of being. It's somewhat mystical, but tends to put readers to sleep....

To get more active, say who does what. Assign responsibility to the system or to the program or, if necessary, to the reader. If you have to tell readers to do something, don't pussyfoot around—tell them. (Are you slipping into the passive because you don't dare to order readers around?)

— Jonathan Price, How to Write a Computer Manual

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