Asking you about the key skills a technical writer should possess provides the interviewer with both a summary of the position from your perspective as well as a list of skills you possess. When preparing for the interview, you should all carefully review the job posting, which lists the requirements for this job and the tasks you will be engaged in. This will provide you with the basis for many of your answers throughout the interview. Reviewing your resume, so you are familiar with the skills and experience the interviewer has used to qualify you for this role will also be helpful.