Purpose Barnes’ Iron Triangle was one of the first attempts to evaluate project success based on time, cost and performance, which were portrayed as interdependent dimensions. Over time, these criteria were expanded and especially criteria taking the satisfaction of stakeholder groups into account are becoming more and more popular. The purpose of this paper is to find out whether specific patterns for the selection of project success criteria across various fields of applications emerged which has not been regarded in literature before. Furthermore, the authors seek to identify of additional key factors influencing project success assessment next to the choice of project success criteria. Design/methodology/approach The paper uses a review of recent literature published in academic journals, in standard references and in widespread project management frameworks (Organisational Competence Baseline, PRINCE2 and PMBoK Guide). Findings The findings show that Barnes’ ideas are an integral part of all approaches investigated in the study. Additionally, the relevance of the so-called “soft criteria” related to the satisfaction of stakeholder groups, could be substantiated. However, the authors found no indications that patterns for the selection of project success criteria have emerged across various fields of applications. Factors influencing project success assessment are not taken into account in the examined articles in a systematic manner. This motivates for further research in this field. Research limitations/implications Access limitations, papers not yet digitally available or the interpretations have an impact on the results. Practical implications For appropriate project assessment the sound and well-rounded selection of hard and soft criteria and the consideration that not the field of application, but influencing factors yet to be analysed influence the selection of project success criteria are crucial. Project management professionals should choose the criteria suitable for their projects individually on a project-by-project basis. Originality/value This paper reveals that no patterns have so far been developed to assess project success in various fields of application. Furthermore, factors influencing project success assessment are not considered in a systematic manner.

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The evolution of project success assessment started with Barnes' Iron Triangle, which was one of the first attempts to evaluate project success based on time, cost and performance. Those criteria were expanded over time, focusing on the satisfaction of stakeholder groups. The question arises whether this focus is also manifest in practice. This article aims to find out whether companies use satisfaction criteria to assess project success and whether different internal project participants are satisfied with project success assessment within their companies. Research designTo obtain new information about project assessment in practice, we chose a qualitative research approach and conducted expert interviews. Experts from different corporate hierarchy levels were asked about the project assessment method applied within their companies, and their opinion about this approach. The interview roadmap was fine-tuned in a pretest at a randomly selected company to ensure its handiness and understandability. The field study was conducted between January and March 2016 with 21 persons interviewed face-to-face and one telephone interview. To improve the quality of digitalized transcripts and protocols, we DECLARATION OF CONFLICTING INTEREST The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article. FUNDING The author(s) received no financial support for the research, authorship, and/or publication of this article.1 eliminated redundancies and mistakes, gathered scattered and similar information, compiled information by content, and reduced data needing analyzing.

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