In order to avoid using gender-related pronouns, some writers use a plural pronoun with a singular subject. For example, "A technical writer should choose their words carefully." Other alternatives are, " a technical writer should choose his or her words carefully" and " Technical writers should choose their words carefully." Which format do you prefer? Discuss these alternatives and other ways around this writing problem.
I tell my students to go plural whenever possible. It's very common to use forms of "they" as indefinite singular pronouns, but it eventually leads to really awful expressions: "A teacher has to ask themself what's correct." Or should it be "themselves"? Ugh.
If you do stick with a singular, then you're usually stuck with "him or her," which is also awkward and self-conscious...especially if you then get into "himself or herself."
Of course you have no problems when you're dealing with a single-gender group: "Each of the nuns checked her watch." "A priest should listen to his archbishop." But most groups are too mixed for such an easy solution.