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Neodymium is found only in tiny quantities in parts used in the speakers of cellphones, for example, making it a challenge to collect meaningful amounts, said Utaro Sekiya, the manager of Dowa's recycling plant.
"It's a challenge to collect comprehensive data," says Nathan Bell, CGS's director of research and policy analysis.
Although most hormonal measures of interest can be examined easily in blood samples, these samples are often a challenge to collect from infants and children.
But there are major challenges to collecting data on VOCs.
Some public transport is deemed "informal," creating challenges to collecting data— particularly in a manner that protects privacy and in a format that is accessible for civic, social, and government sectors.
Yet in many contexts, there are significant challenges to collecting this data, including cost constraints, the lack of availability and trained operators of hand-held GPS devices, and the difficulty in finding staff who have the time or training to organize spatial data.
Challenges to collecting appropriate data have been noted [ 5, 9]; increased effort should be put into routine data collection to ensure that good quality data to measure standard indicators are collected, and shared.
There were also considerable challenges to collecting the letters for the audit especially in the first part of the audit cycle where GPs had to identify letters penned several weeks or months previously.
In addition, the challenges to collecting data in humanitarian settings are well-recognized [ 55, 56], and population-based surveys may be particularly challenging in these unstable and insecure settings [ 57].
