Generality is assured by requiring that the causal factors in the situation be understood and that the relationship of the situation to the target be understood. Detectability is maximized by the control of noise and by using experimental designs which produce strong effects. Meaningfulness is established via the maximization of accountable variance both across subjects and across phenomena. Beliefs are considered conjecture until supported by fact. Only one kind of existence is accepted.
Sense data is considered the final arbiter of beliefs.
All events are considered to have a cause, and a cause must precede its effect.