Understanding source code through projectional editor

The purpose of this paper is to give a report of an observational study involving program comprehension with the projectional editor that enables custom views of the source code. We briefly discuss the issues of program comprehension and motives behind projectional code editing. We also give an overview of two projectional editors focused on concern location and compare their features and use cases. The Code Bubbles editor is evaluated in an observational study observing the process of a source code comprehension. The study suggests the benefits of code projections even for large, unknown code base.