1. A system for forecasting discovery costs comprising: a memory; and a processor, the processor configured to implement instructions stored in the memory, the memory storing executable instructions, the processor comprising: a trend engine that receives historical facts relating to past and current discovery and generates at least one model based on quantities and qualities of the historical facts; an expert review user interface (UI) that receives user input and that transmits the user input to a forecasting engine, wherein the user input includes input of a degree of progress within a matter lifecycle for a current discovery matter; and a forecasting engine that receives the at least one model and current facts, generates a discovery cost forecast for the current discovery matter based on the at least one model and the current facts, receives the user input from the expert review UI, overwrites one or more steps of the discovery cost forecast for the current discovery matter with the user input, and generates an updated discovery cost forecast for the current discovery matter.