Impresa is an attempt to build a "Roleplaying Game Design Kit", offering different modules with which to build a customized RPG system. It was dropped from the Precis Intermedia RPG line shortly after it's release.
Impresa characters are convertible to Active Exploits and genreDiversion.
A character is mainly defined by abilities and skills. Every skill is governed by an ability. The ability rating (0-6) defines how many d10 may be rolled in a skill check. The skill value (2-8) sets the maximum number a die may show to be counted as a success (called step). The difficulty of the attempted task determines the numbers of steps required to succeed at the task.
There is also a lick ability that may be used to add dice to a roll by expending luck points.
Characters gain experience points whenever they succeed at tasks of a certain difficulty. The experience point is attached to the skill that was used and can be spent to either add dice to a skill roll or may be traded for improving the skill value.
Combat is divided into 5-second turns. Acting sequence is determined by a d10, but more dice may be added by sacrificing certain ability dice in for the remainder of the turn. For each extra die, the character also gains an additional action but the action must use the ability that was used to increase the initiative value.
Damage is rolled with a number of d10 depending on the weapon. Every die that rolls below 10 minus the armor rating inflicts a level of fatigue or injury. There are five levels of injury and the higher ones give a penalty to skill rolls.
Impresa lays the groundwork for using magic or super powers by offering additional abilities and skills, but this topic is not expanded in the main rules.