The inclusion of a concise instrument to measure certain fundamental age-appropriate cognitive skills would be a source of valuable information (Grosh and Glewwe, 2000).The modules proposed by MPPN include dedicated questions to that end. This is not only applicable to the school population; it is valid for adults too, since there is no information on whether they have the cognitive skills to participate adequately in modern societies. Aspects such as income from second jobs, payment in kind, the distinction between gross and net income or how to measure public transfers, to name but a few, are issues that need to be properly addressed before the monetary resources of households can begin to be measured more adequately.