Existing common law provides the standards that a petitioner must satisfy in order for a court to modify a prior custody determination. This bill would replace those existing common law standards and provide a new standard for determining if the modification of any existing custody order is warranted by requiring a material change of circumstances and a showing by a preponderance of the evidence that the modification is in the best interest of the child. This bill would also provide factors that a court must consider when determining whether the modification is in the best interest of the child.