MT post editing is the process to improve a machine-generated translation by fixing grammar mistakes, incorrect terminology, mistranslation, wrong word order, or syntax errors. It's an important step to ensure that MT translated texts meet the quality requirements of the final output. With the proliferation of Google translator, Bing and other customized machine translation systems in recent years, MT post-editing has gained popularity as a method to gain translation productivity by human translators. Depending on the source content quality (such as content written in a controlled or simple language) and the availability of good terminology glossaries, MT post editing can help a company gain 10% or more on translation efficiency.