In many investigative games, important clues are missed because of failed dice-rolls, resulting in play grinding to a halt. Using a “point spend” system, the GUMSHOE rules revolutionize investigative scenarios, by ensuring that players are never deprived of the clues they need to move the story forward.
The GUMSHOE System is player-facing, putting die rolling in the hands of the players whenever possible. It also contains full guidance on designing your own investigations.
The GUMSHOE System
is a role-playing game system created by Robin Laws, designed for running investigative scenarios. The premise is that investigative games are not about finding clues, they are about interpreting the clues that are found. The GUMSHOE System is used in various games published by Pelgrane Press.
Source: Wikipedia, "GUMSHOE System", available under the CC-BY-SA License.