Figure 3 shows the distribution of comments categorized by the interviewees and theirratings. The interviewees ratedalmost 69% comments as either useful or somewhat useful. Most of the comments identifying functional defects (categories from 5 to 11 in Figure 3) were rated as ‘Useful’. More than 60% of the “Somewhat Useful” comments belong to the first four categories: documentation in the code, visual representation of the code (e.g. blank lines, indentation), organization of the code (e.g. how functionality is divided into methods), and solution approach. These four all belong to the class termed “evolvability defects” as classified by Mantyla et al. [15] and represent issues that affect future development effort rather runtime behavior.