The main objective of the present research is to evaluate the influence between just-in-time technique (JIT) and total quality management TQM in project performance evaluation (PPE) in the paint industry; and to identify the important factors that should be considered for the successful application of JIT in project management in the paint industry ar Riyadh Governorate. A questionnaire was distributed to administrators, economists and accountants in the paint industry. The study used the partial least squares program for analysis purposes. The results indicated that the just-in-time technique has a positive impact on the evaluation of project performance in the balanced scorecard in its dimensions (financial, customers and internal operations), and a negative impact on the growth and learning dimension. The results also revealed a positive impact of total quality management on the evaluation of project performance in all dimensions of the balanced scorecard, and it plays an important mediating role in improving the impact of total quality management on the evaluation of performance by the balanced scorecard.