This work aims to improve comprehension of the practices system by examining the interrelationships among them with the DEMATEL technique. A number of project management best practices have been identified and corroborated by prior studies and semi-structured interviews with project specialists. Relationships among these practices have been categorised as “cause” and “effect” factors. Data on 537 engineers, project managers, and administrators was collected, encoded, and assessed. Nonparametric tests and descriptive have been utilised to characterise the sample, evaluate hypotheses, and address the enquiries. All responders agreed and endorsed the necessity of the techniques specified in this project. Despite this total being consistent, significant disparities in the perceived relevance of these best practices emerge between construction professionals and the project team. A statistically significant correlation existed between the cause and effect of best practices, alongside notable differences in participants' perceptions of best practices and success indicators based on gender, age, education level, profession, current work experience, and overall experience. Ultimately, recommendations were provided to the construction sector to enhance their project management methods.