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Evaluation is a vast field of designs and methods in continuous development. The numerous parameters and choices associated with different methodological options can be difficult to fully understand without deep study and desk review. The motivation for the Periodic Table of Evaluation was to create a one-pager visual that catalogues methodological...
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... Extending beyond classifications in text and table format, scholars have also developed various visualizations invoking images such as trees, rivers, the periodic table, subway systems, maps, and most recently gardens. These visual frameworks are the focus of this special issue (listed historically from year of first publication): the evaluation theory tree (Christie & Alkin, 2004;Alkin, 2013;Alkin & Christie, 2023), the tree of evaluation approaches (Mertens & Wilson, 2012, the evaluation river (Azzam & Donaldson, 2012, 2013, the periodic table of evaluation (Vaca, 2017), the evaluation metro map (Lemire, 2020), the map of evaluation uses (Quadrant Conseil, 2022), and the garden of evaluation approaches (Montrosse-Moorhead et al., 2024). ...
Evaluation theory has played and continues to play an important role inthe practice and profession of evaluation. Over the years, and as the range of evaluation theories has continued to grow, evaluation scholars and practitioners have developed various visual classification frameworks of evaluation theory, invoking images such as trees, rivers, the periodic table, metro maps, concept maps, and most recently gardens. The purpose of this special issue is to explore various visualizations of evaluation theory and to discuss their benefits and implications for the practice and profession of evaluation.
Evaluation competency frameworks across the globe regard evaluation approaches as important to know and use in practice. Prior classifications have been developed to aid in understanding important differences among varying approaches. Nevertheless, there is an opportunity for a new classification of evaluation approaches, in particular one that is practitioner-oriented, intended to guide decision-making in practice, and inclusive of all scholarship. The evaluation garden presented in this article begins to map approaches against eight dimensions of practice and situates them in their philosophical orientations and methodological dispositions. This allows for approach comparison, a more nuanced understanding of where they overlap and differ, and how and where they can be intentionally combined. The goal is to offer a visual classification that addresses prior criticisms, that is of use to a wide range of audiences, and that helps evaluation practitioners be able to more easily integrate evaluation approaches in practice.