After divorce, how do majority of parents react to custody arrangements?

Typically, the parents abide by the court-ordered arrangements for custody. However, it is not uncommon for the terms to change shortly thereafter the divorce due to change in lifestyles (i.e., re-marrying, financial problems, ect.). Original custody arrangements/orders can be modified through the court, so long as a significant change in circumstance has occurred, and the parent or parents can substantiate that change.