What problems did the developers face

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Centralized approaches offer more data analysis than decentralized models: they allow for notifications about dangerous contacts, but they don’t give officials extensive access to the information. These models — such as those proposed by Google and Apple, and currently used by the NHS — are less intrusive. Their creators hope that privacy protections will increase trust in the app and encourage more people to use it.

There were other factors that influenced the UK’s choice. The country bangladesh number data has limited testing capacity and staff to track and trace. This meant that a decentralized system could be overwhelmed if it received notifications of every potential infection, while a centralized system that only counted confirmed cases would require fewer resources.

At the same time, officials were hungry for fame (and even knighthood) and planned to create an app that would be not just successful, but the best in the world. The choice was tilted in favor of a centralized model, and the problems associated with development were ignored.


One of the many technical hurdles was how Bluetooth works. Virtually all contact tracing apps use this technology to track who has been near whom. In theory, if Bluetooth is always on, the data will be very accurate and reliable, and the health system will not be overwhelmed by false positives, which would reduce trust in the system and require thousands of additional tests and forced people to self-isolate. But in practice, getting accurate results has been difficult, and improving their quality has required the efforts of developers around the world.