Carter, 89, arrived here today to observe the November 19 polls.
Atlanta-based Carter Center, an international poll observation organisation, headed by the former US President, has mobilised 64 election observers including 12 long-term observers for monitoring the election.
"We have been very pleased at the preparations for the election.
"We have great confidence... That the people of Nepal will orchestrate a very successful and honest and fair and a peaceful election," he told reporters.
The Carter Center had also sent its observers to monitor the first Constituent Assembly polls in Nepal in 2008. Carter had also visited Nepal then.
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He is also scheduled to meet senior political leaders, civil society members and journalists in Nepal.
The European Union (EU) has already deployed 100 election observers across the country.
The UN Secretary-General Ban Ki-Moon has said that he has been highly encouraged by Nepal's preparations for the upcoming Constituent Assembly polls on November 19.
Ban, in a statement, appealed to all stakeholders in Nepal to conduct the Constituent Assembly elections peacefully and redouble the efforts in the urgent task of writing the constitution.
"The UN Secretary General has also expressed his commitment to supporting Nepal on its path to a peaceful, prosperous and democratic future," the spokesperson said.