Quantifying Bias in Hierarchical Category Systems.

Categorization is ubiquitous in human cognition and society, and shapes how we perceive and understand the world. Because categories reflect the needs and perspectives of their creators, no category system is entirely objective, and inbuilt biases can have harmful social consequences. Here we propose methods for measuring biases in hierarchical systems of categories, a common form of category organization with multiple levels of abstraction. We illustrate these methods by quantifying the extent to which library classification systems are biased in favour of western concepts and male authors. We analyze a large library data set including more than 3 million books organized into thousands of categories, and find that categories related to religion show greater western bias than do categories related to literature or history, and that books written by men are distributed more broadly across library classification systems than are books written by women. We also find that the Dewey Decimal Classification shows a greater level of bias than does the Library of Congress Classification. Although we focus on library classification as a case study, our methods are general, and can be used to measure biases in both natural and institutional category systems across a range of domains.

Talking to children about their HIV diagnosis: a discussion rooted in different global perspectives.

An online meeting was arranged with four professionals representing four countries to debate current practices and future steps in naming HIV to children (disclosing HIV status). This article considers the evidence and reports on the commentary and debate from the meeting. Naming HIV to children remains a challenge. Although studies identify some of the facilitators and barriers to informing children of their HIV diagnosis, further review of practice is required. This article presents a global perspective of naming practices from different settings. The article comprises commentary and a report of the online debate, along with supporting evidence. The four participating authors concluded that health professionals must work in collaboration with families to support early naming of HIV to children or having an open discussion about HIV in clinics. Naming when a child is younger reduces self-stigma and empowers children and young people to adhere to their medication, make informed decisions and share their own diagnosis appropriately. The authors concluded that health professionals play a key role in educating colleagues and the public to reduce stigma and discrimination. Professionals working with children and families living with HIV require support and resources to instil confidence in naming and facilitate naming of HIV status to a child.