Consider this study.
Dr. Gail Matthews, a psychology professor at the Dominican University of California, conducted a study that is worth sharing here. The study found that participants who wrote down their goals achieved at a significantly higher level than those who didn’t.
In fact, you are 42% more likely to achieve your goals if they are written goals.
The study also found that more than 70% of participants met their goals when they also sent weekly updates.
Source: Goals Research Summary (PDF here: Goals Study), by Gail Matthews, Ph.D., Dominican University of California