The purpose of the research was to examine the function and application of delimitations--what the researcher includes and excludes in a study--in the dissertation process. The aim was to map the delimitations process to improve research, rigor and relevance of findings, and doctoral completion rates using a formalized and standardized approach applied flexibly. The structure of delimitations in dissertations were examined using descriptive quantitative statistics and a qualitative thematic analysis from 28 universities. The first stage included delimitations from 30 dissertations. Triangulation was conducted using the findings with a training set of delimitations in 15 dissertations with a rubric generated from the primary sample. Findings suggested doctoral students used delimitations haphazardly and lacked a systematic application to research. Three major themes emerged from the delimitations sections: rituals, equifinality, and pragmatism. Topics within delimitations sections centered around two axes: the internal topics of sampling procedures and factors/variables and external topics of research design and conceptual/theoretical framework. Poorly understood and developed delimitations negatively impacted findings in dissertations, completion rates, and future research skills of doctoral students. By applying delimitations to a design of research framework in a community of learners, doctoral students and dissertation chairs could improve the dissertation completion process and improve research results using a Delimitations Evaluation Rubric.