19. A processing device as claimed in claim 15 , further comprising a controlling unit arranged for controlling an iterative step, in which similarity distance computation is performed by using an updated set of features and weights for retrieving the second subset of similar cases for the user.
19. A processing device as claimed in claim 15 , further comprising a controlling unit arranged for controlling an iterative step, in which similarity distance computation is performed by using an updated set of features and weights for retrieving the second subset of similar cases for the user. 20. A processing device as claimed in claim 19 , further comprising an evaluating unit arranged for generating a new set of features and weights as a new baseline for similarity distance computation based on a plurality of personal settings for features and weights collected from a group of users.