|Which is correct?
Ajax and Flex are __________ technologies in RIA development for SOA.
Complementary refers to things that work together to make something more complete. If we say that Ajax and Flex are complimentary, it means that they say nice things.
Complimentary can also mean given freely as a courtesy but the context in which the complimentary item is offered has to be made clear. For example: Hotels often provide complimentary high-speed Internet for guests.