1. Proficient with X
This usually implies that X is an instrument, e.g. "proficient with an axe", "proficient with firearms", etc.
2. Proficient in X
This usually implies that X is a skill or a discipline, e.g. "proficient in using Google", "proficient in martial arts", etc.
In your example, "proficient with technical manuals" seems to suggest that the person uses technical manuals as an instrument (perhaps for hitting IT helpdesk operatives with).
On the other hand, "proficient in technical manuals" suggests he has a wide knowledge of technical manuals, which is probably not your intended meaning.
Perhaps "proficient in writing technical manuals" would do the trick!
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AnonymousCan one say that a person has "proficient computer skills" or is it preferable to say that they are "proficient with computers"?Hello LF,
The person, not the skills, are "proficient". (The level of skill is what makes the person "proficient".)
If anyone can add to that will be good
This is OK, but pretty vague.
eg Can you build one?
eg Can you program one?
eg Can you use various kinds of software applications?
People are waiting to help.
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