1. A method for determining an intended action of a user of a computing system environment, the computing system environment comprising a voice system, the intended action being specified via a spoken input of the user, wherein the method comprises acts of: obtaining a decoding of the spoken input of the user, wherein the voice system has a precise machine-based grammar to allow the user to invoke the intended action by speaking one or more predetermined voice commands and wherein the spoken input is a free form voice instruction that is different than the precise machine-based grammar; and extracting the intended action from the decoding of the spoken input using an iterative hierarchical extraction process comprising analyzing the decoding of the spoken input in multiple hierarchically dependent semantic stages, comprising: determining a first level of classification of the intended action from the decoding of the spoken input during a first semantic stage of the iterative hierarchical extraction process, the first level of classification having a plurality of sub-classifications associated with the first level of classification; and determining, from among the plurality of sub-classifications associated with the first level of classification, a second level of classification of the intended action from the same decoding of the spoken input during a second semantic stage of the iterative hierarchical extraction process.