Creators of health and medical communications often test their work with a subset of their target audience before its wider release. This practice is particularly important when content creators are not themselves part of their target audience, as is often the case for communications that address vulnerable communities such as senior citizens[64] or immigrants with English as a second language.[65] Usability research can include techniques such as “think aloud” testing, in which potential users talk the researcher through their navigation of a given computer program or text. Evaluations by experts in other fields, such as design or user experience, are also employed.