(19)General risk drivers of the items assigned a rating category should also be taken into account. The size and the degree of activity diversification of the items assigned a rating category should be considered as relevant indicators of their underlying risk profile. It should also be possible to consider as qualitative factors other measures of creditworthiness assigned to items of the same rating category, in order to convey additional information with respect to the default behaviour of the relevant rating category. The relevance, objectivity and reliability of the different measures of creditworthiness should be carefully analysed before their application for the purpose of the mapping exercise.