Through the 1980s South East Asia saw a boom period - but an economic crash in 1997 left most economies struggling. Singapore has the most developed economy of the region - based on banking and trade.
Thailand quickly reformed the economy and the economy grew quickly, along with Philippines, balancing industrial growth with traditional industries. Malaysia has also grown considerably, moving into electronics and electronic goods.
Other nations had a slower growth, war left Cambodia and Vietnam behind for many years, and Laos remains landlocked so lacks the trade capabilities.
ASEAN was formed to promote trade, development and economic stability