Although the exact cause of the incident is unknown, the following list below refers to generally accepted "Deadly Sins" that must be considered for all falling activities. Please take the time to review and discuss with your crews.

1. Failing to progressively fall danger trees into open areas with the falling of other timber and before falling adjacent live trees.
2. Using the practice of "Domino Falling".
3. Leaving cut-up trees and failing to mark such trees and notify the work place supervisor and workers whom may enter the affected area of the location of the cut-up trees.
4. Failing to take appropriate measures to control the fall of trees, which may include:
   • Not ensuring the undercut is complete and cleaned out
   • Not leaving sufficient holding wood
   • Carelessly cutting off the corners of holding wood
   • Not ensuring that the back cut is placed higher than the under cut
   • Failing to have wedging tools immediately available at the tree being felled
   • The unnecessary brushing of timber.
5. Permitting workers, other than the faller and those permitted by the regulations, to be within two tree lengths of the tree being felled.
6. Falling trees within the specified minimum distances from unguarded overhead energized high voltage electrical conductors without complying with the requirements.