What do I need to know about IAS?

IFS needs more mental flexibility for moving around the world for service to the government. IAS does not need to move around that much like an IFS. So, being an IFS one should be mentally prepared about service, family and other concerned things of life.
For More Information Please Refer:
https://www.quora.com/Which-one-is-better-IAS-or-IFS
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