IEF may refer to:

• Index of Economic Freedom
• Information Engineering Facility
• Isoelectric focusing

The Index of Economic Freedom is a series of 10 economic measurements created by the Wall Street Journal and The Heritage Foundation to measure the degree of Economic freedom The IEF (Information Engineering Facility was the first name of a full lifecycle Computer-aided software engineering (CASE tool which has now gone through three different Isoelectric focusing (IEF, also known as electrofocusing, is a technique for separating different Molecules by their Electric charge differences

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