 The second way in which ergodicity seems to be too strong is that even if eventually we can come by proofs of ergodicity for the relevant systems, the assumption is too strong because there are systems that are known not to be ergodic and yet they behave in accordance with the Second Law. Bricmont (2001) investigates the Kac Ring Model and a system of \(n\) uncoupled anharmonic oscillators of identical mass, and points out that both systems exhibit thermodynamic behaviour and yet they fail to be ergodic. Hence, ergodicity is not necessary for thermodynamic behaviour. Earman and Redei (1996, p. 70) and van Lith (2001, p. 585) argue that if ergodicity is not necessary for thermodynamic behaviour, then ergodicity cannot provide a satisfactory explanation for this behaviour. Either there must be properties other than ergodicity that explain thermodynamic behaviour in cases in which the system is not ergodic, or there must be an altogether different explanation for the approach to equilibrium even for systems which are ergodic.