Abstract: According to an embodiment, a human reliability assessment tool includes at least one performance assessment worksheet regarding at least one of the group of the evaluation of a scenario, the making of a decision selecting a response to the scenario, and the carrying out of the response. The performance assessment worksheet is an electronic structured information entry document on machine-readable media enabled by a processor of a computerized device. A plurality of checklist information entry items is incorporated into the performance assessment worksheet. A modeling portion of the performance assessment worksheet is structured for recording an information entry relating to a step in a model of human performance. A linkage is formed between the checklist information entry items and a plurality of related effects within a relevant operational environment. An automated determination is made as to whether specific performance levels are achieved within the relevant operational environment.