1. A managing apparatus for managing a software development and maintenance system, the managing apparatus comprising: an issue memory configured to store a set of issues, each issue of the set of issues specifying an implementation of software feature or a bug fix of a software code base of a software system; a construct memory configured to store a set of constructs, each construct of the set of constructs being an implementation of an issue and an element of the software code base of the software system; an issue vector generating device configured to establish a set of issue vectors, wherein each element of an issue vector of the set of issue vectors specifies changes of a construct of the stored set of constructs in association with at least one issue of the stored set of issues; a computing device configured to compute a statistical value using the established set of issue vectors; and a determining device configured to determine a relationship between an issue and implementation of the issue, the determination of the relationship comprising determination of a degree of interdependence between two issues of the set of issues, the determination of the degree of interdependence comprising indication, based on the computed statistical value, to which extent implementations of the two issues are intermingled with each other, such that the implementations affect the same set of constructs to an extent that is defined by a statistical correlation or a Pearson index of the established set of issue vectors.