Christian Aid along with Islamic Relief and World Jewish Relief this week debated how they should work with people of other faiths.
Using examples of existing joint work in Mindanao in the Philippines, Kashmir and southern Sudan - delegates spent time learning from each others' experiences.
Development minister Ivan Lewis MP also spoke to delegates.
A timely gathering
The Keeping Faith in Development conference was held less than two months after the murder of Gayle Williams, a development worker in Afghanistan.
Her death highlighted the extremely sensitive and important issues raised by the presence of faith-based organisations in communities with different religions.
Christian Aid�s inter-faith manager, Nigel Varndell, said: �We wanted to dispel the myths that we only work with people of our faith.
'We also wanted to convince people of all faiths of the value of interfaith work, and to share examples of best practice.'
A distinctive contribution
Ivan Lewis told delegates that faith-based charities had a distinctive contribution to make in international development work.
In particular, he said that their identity as people of faith could help them to gain the trust of local communities with their own, albeit different, religious beliefs.
He also urged faith-based development organisations to do more to keep poor countries� need for aid high on the public agenda. He warned that while the critics of aid were increasingly likely to demand evidence of its effectiveness, development agencies had a responsibility to demonstrate its maximum effect.
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