The case assessment must include consideration of both parties' ability to provide support as well as significant changes in circumstances pertaining to the welfare of the child(ren). Caseworkers can use a variety of automated sources, self-generated documents, and interview methods to obtain current financial, assets, and wage data for the responsible parents. Additionally, the availability of health insurance must be pursued if no medical support provisions are included in the order. Written verification from employers should be the primary source of third-party verification. Once the most current income information becomes available, caseworkers should use the Obligation Calculation Worksheets to determine the change in the support obligation. Fifteen percent (15%) is the minimum amount of potential increase or decrease in the support obligation to justify an attempt at adjustment by CSE. Child Support Guidelines, an increase or decrease of fifteen (15%) or more is considered a change of circumstances warranting modification of an order that is three (3) years old or older. However, if the order is less than three (3) years old, additional evidence of a significant change in circumstances is required for review and potential adjustment of the order. Other factors specific to the case, such as the needs of the children involved, must also be taken into consideration as the review process continues. Once the case evaluation is completed, caseworkers determine if an adjustment is needed. Whether or not an adjustment is necessary, caseworkers notify both parents. Caseworkers obtain the judge's signature, and then the order is filed with the court.