Book of the month: Invisible Women: Exposing Data Bias in a World Designed for Men.
by Caroline Criado Perez.
Review by Deborah Foy, Global Executive Director, Opportunity International Inc.
As a young child, one of my favourite books was an old copy of Ripley's Believe It or Not! given to me by my grandparents. I loved its extraordinary, almost unbelievable facts. I hadn't expected a book about gender inequality to provoke the same reaction, but Invisible Women did. The main difference was that this time, my amazement quickly turned to anger.
In her book, Caroline Criado Perez reveals how much of our world has been designed around men, because women's bodies, experiences and needs are so often missing from the data used to make decisions. From crash-test dummies modelled on male bodies, to medical research that has historically overlooked women, the examples are jaw-dropping, sometimes absurd and often deeply shocking. It’s one of those rare books where you find yourself wanting to underline something on almost every page.
The book has prompted me to reflect on our own work at Opportunity and within the international development sector. Where might we be overlooking women's experiences or making assumptions about their needs, simply because we're not asking the right questions or collecting the right data?
Some years after the book's publication, we're still uncovering extraordinary examples of the same biases. For example, a 2024 study of more than 2,300 informal workers in India found that women faced 3 times the risk of heat-related illness compared with men. One of the reasons was inadequate sanitation provision. Imagine working all day in extreme heat but having to consciously restrict your water intake to avoid needing to go to the loo.
In Ghana, research published earlier this year found that 92% of health workers recognised bilharzia, yet fewer than 17% had adequate knowledge of how it affects women's reproductive organs. Women with this form of the disease can be misdiagnosed with sexually transmitted infections, potentially facing stigma and accusations of infidelity as well as missing appropriate treatment. It’s a powerful example of how an apparently technical gap in medical knowledge can have profound consequences for a woman's health, relationships and dignity.
Closer to home, research published in February 2026 in the UK found that 82% of AI-generated images of doctors depicted men (despite women making up the majority in the NHS training figures used for comparison). More shockingly still, both AI systems portrayed every GP and orthopaedic surgeon as male. It’s alarming to think that even our newest technologies risk perpetuating the very prejudices that have excluded and disadvantaged women for centuries.
I was so fired up by this book that I bought copies for my daughter, niece and friends! I also found myself discussing it at length with equally astonished colleagues across the Opportunity family.
Here in the UK, we often like to think that women have achieved equality. But Invisible Women is a startling reminder that removing legal barriers doesn't mean the playing field is level. As a close friend recently described it to me, women are still swimming upstream, navigating systems, assumptions and technologies that weren't designed with us in mind.
For those of us working to expand economic opportunity for women, Criado Perez's words are particularly challenging: “We have to stop acting as if theoretical, legal equality of opportunity is the same as true equality of opportunity.”