Singapore's civil servants are the most efficient among their Asian peers, a business survey on 12 economies released on Wednesday showed, but they tend to clam up unhelpfully when things go wrong.

The island-state was ranked first for a third time in a poll of 1,274 expatriates working in 12 North and South Asian nations on the efficiency of bureaucrats in those countries. The poll was last held in 2007.

During normal times, when the system is not stress-tested, it operates very well, Hong Kong-based Political & Economic Risk Consultancy said in a 12-page report of Singapore's bureaucracy.

However, during difficult times - or when mistakes are made that reflect badly on the system - there is a tendency among bureaucrats to circle the wagons in ways that lack transparency and make accountability difficult, the report said.

India's suffocating bureaucracy was ranked the least-efficient by the survey, which said working with the country's civil servants was a slow and painful process.

They are a power centre in their own right at both the national and state levels, and are extremely resistant to reform that affects them or the way they go about their duties, PERC said.

Thailand, despite four years of on-off street protests and a year of dysfunctional government was ranked third. For all the country's troubles -- or perhaps because of them -- respondents to our survey were impressed with the way Thai civil servants have been carrying out their duties, PERC said. It said state offices associated with corruption presented the most difficulties for Thai citizens and foreigners.

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