Urban areas of developing countries face the challenge to implement adequate water and sanitation infrastructures while using natural and financial resources sustainably.
It was during September 2014 when President Obama asked communities around the United States to accept the challenge to "implement a coherent cradle-to-college-and-career strategy for improving the life outcomes of all young people".
X-ray ToF CSI may provide limited three-dimensional information, signifying an improvement on the current CSI systems used for cargo screening, however, the challenges to implementing such a system are numerous and significant extra work is required before such a system can be implemented.
Unfortunately, the challenges to implementing such trials are significant.
Nor are the challenges to implementing such evaluations.
Despite the challenges to implementing Xpert, a number of opportunities for strengthening many aspects of TB prevention, diagnostic, and treatment programs are emerging.
Some of the challenges to implementing PEC in Africa have been lack of clarity regarding the definition and the scope of PEC and who should be trained to deliver which elements and what would constitute the minimum skills required.
The challenges to implementing evidence-based PTs are enormous: several barriers have been identified ranging from inadequate investments in mental health care to stigma associated with mental illness (Saraceno et al., 2007).
Our study revealed a number of new findings in relation to how providers' values and attitudes affect their provision of services and added to existing knowledge about the utility of the Street Level Bureaucrats theory for understanding the challenges to implementing sensitive policies in a lower-middle income setting.
In this section, we describe three broad questions related to chemical mixtures that epidemiological studies could address; in Table 1, we list examples of how these questions have been addressed using different approaches, as well as the challenges to implementing them.
