Difference between Sequential and Weak Sequential Equilbria

Question

This is in reference to the Game theoretic concepts as Nash equilibrium refinements. Sequential equilibrium are often defined as satisfying two conditions: consistency and sequential rationality. Whereas Weak Sequential Equilibria (sometimes referred to as Weak Perfect Bayesian) also necessitates sequential rationality, but has a weaker consistency requirement,which is my main source of confusion. Moreover, SE and WSE(WPBE) are often coincide as sets of solutions which really only adds to the frustration of trying to differentiate these almost identical concepts. My main question is, how would I go about checking the consistency requirement for a given extensive form game?