Abstract: The present technology concerns techniques for analyzing a legacy system based on at least one trail. The at least one trail includes multiple instances of screens of the legacy system. Plural pair-wise distance measures of the screen instances in the at least one trail are calculated. The pair-wise distance measures indicate a similarity of the respective pair of screen instances that indicates that the pair may originate from the same screen of the legacy system. At least one cluster analysis algorithm is applied on the plural pair-wise distance measures to group the screen instances into at least one screen group, and a map of the legacy system is built based on the at least one screen group.

Abstract: The present invention concerns a method for analyzing a legacy system (20) based on at least one trail (100, 101), wherein the at least one trail (100, 101) comprises a plurality of instances (110) of screens of the legacy system (20) and wherein the method comprises the following steps: a. calculating a plurality of pair-wise distance measures of the plurality of screen instances (110) in the at least one trail (100, 101), wherein the pair-wise distance measures indicate a similarity of the respective pair of screen instances (110) that indicates that the pair may originate from the same screen of the legacy system (20); and b. applying at least one cluster analysis algorithm on the plurality of pair-wise distance measures to group the screen instances (110) into at least one screen group (200) and building a map (250) of the legacy system (20) based on the at least one screen group (200).