This paper evaluates the effects of using the NUDIST (Non-numerical, Unstructured Data Indexing, Searching and Theorising) computer program to organize coded, qualitative data. The use of the software is discussed within the context of the study for which it was used: an Australian study that aimed to develop a theoretical understanding of the challenge that students who fail to learn pose for neophyte teachers' images of effectiveness. The potential for interacting with the data during the process of creating and collapsing categories into more over-arching theoretical constructs is considered as it relates to NUDIST's procedural and structural influence on eventual analytical outcomes. Topics covered in the paper include: (1) the aims and processes of qualitative analysis; (2) the computer as a tool in qualitative analysis; (3) NUDIST in qualitative analysis; and (4) examples of using NUDIST to theorize in the self-image study. A description of NUDIST and a description of the study for which it was used are appended. (Contains 14 references.) (KRN)