Sæle, R. G., Dahl, T. I., Sørlie, T., & Friborg, O. (2017). Relationships between learning approach, procrastination and academic achievement amongst first-year university students. Higher Education, 74(5), 757–774. http://www.jstor.org/stable/26448802
Procrastination significantly decreases GPA for college students in this study.
It is noted that with both study methods procrastination contributes for a large amount of the variability
From this, I can conclude that procrastination is detrimental to the learning process and needs to be mitigated.