BASIC TASK RESOLUTION SYSTEM
These rules assume a standardized system for determining the success or failure of any given task. That system is:
d20 + Modifiers vs. Target Number
The Modifiers and Target Number are determined by the type of task.
If the result of the d20 roll + the Modifiers equals or exceeds the Target Number, the test is successful. Any other result is a failure.
A "natural 20" on the die roll is not an automatic success. A "natural 1" on the die roll is not an automatic failure, unless the rules state otherwise.