 A shallow approach that involves "ask the user about each ambiguity" would, by Piron's estimate, only automate about 25% of a professional translator's job, leaving the harder 75% still to be done by a human.One of the major pitfalls of MT is its inability to translate non-standard language with the same accuracy as standard language.Heuristic or statistical based MT takes input from various sources in standard form of a language.