Why should it be evaluated/measured:

To be accountable, not only there are formal requirements which need to be met, but the public should also perceive the judiciary as accountable. So, there are two levels of accountability – objective and subjective. Although there are provisions on the formal accountability procedure, the subjective perception of citizens on the accountability of the judiciary or of the judge is of equal importance. For example, judges and the judiciary should not be perceived as a “closed shop” concerned with the management of their interests, rather than with the interests of society[1].

[1] Ibid, p.11