![]() Originality/value – This research develops the understanding of a key project management concept by clarifying which concepts are part of the Iron Triangle, based on evidence of how the concept is used in research. Other concepts that are core to the Iron Triangle were also identified, and how these have changed over time. ![]() These links were significantly stronger than links to alternatives, such as Scope, Performance, or Requirements. Findings – Significant links were found between Time, Cost, and Quality, verifying these concepts as the vertices on the Iron Triangle. Key concepts in the project management literature were explored using scientometric research techniques, to understand the relationship between these concepts. ![]() However, the status of quality is contested. Time and Cost are consistently identified as part of the Iron Triangle. Three corpora were constructed, representing the project management and Time, Cost, and Quality Management literature. Design/methodology/approach – This paper explores 45 years of project management research, drawing on a database of 109,804 records from 1970 to 2015. The purpose of this paper is to explore which concepts are part of the Iron Triangle, and how these concepts have changed over time. However, there is disagreement about which criteria should be represented on the vertices of this triangle. Purpose – The Iron Triangle, also called the Triple Constraint, is a central concept to project management research and practice, representing the relationship between key performance criteria.
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