  The main aim of this work is to present two different methodologies for
configuration averaging in disordered systems. The Recursion method is suitable
for the calculation of spatial or self-averaging, while the Augmented space
formalism averages over different possible configurations of the system. We
have applied these techniques to a simple example and compared their results.
Based on these, we have reexamined the concept of spatial ergodicity in
disordered systems. The specific aspect, we have focused on, is the question
"Why does an experimentalist often obtain the averaged result on a single
sample ?" We have found that in our example of disordered graphene, the two
lead to the same result within the error limits of the two methods.
