1. A system for classification, the system comprising: a storage apparatus, configured to store information pertaining to each item of a set of items, the information being indicative of: (a) a quantity of occurrences of the item in a sample; (b) a quantity of successful occurrences of the item in the sample; and (c) at least one attribute of the item with regard to at least one variable out of a set of variables; wherein the quantity of occurrences of at least one of the items is larger than one; and a processor, comprising: a classification scheme determination module, configured to define a classification scheme for classification of items into classes based on at least one of the variables in a defining process which includes assigning a score to a variable out of the at least one variable, based on a plurality of quantities of successful occurrences of items, each of the quantities is a quantity of successful occurrences having a corresponding attribute out of a plurality of attributes of the variable; a class management module, configured to obtain a respective subset of the plurality of items for each out of a plurality of the classes, by applying the classification scheme to attributes of a plurality of items of the set; and to determine, with respect to each class of the plurality of classes, an outcome estimation based on quantities of successful occurrences of items of the respective subset of items of said class; and a performance analysis module, configured to compute for an analyzed item a performance assessment which is based on an outcome estimation of a class out of the classes that is a result of application of the classification scheme to attributes of the analyzed item, thereby enabling a selective application of an industrial process, wherein the selective application is responsive to the performance assessment.