Revised Code 3109.04 governs court awards of parental rights and responsibilities, as well as the modification of shared parenting agreements, providing in pertinent part as follows: (E)(1)(a) the court shall not modify a prior decree allocating parental rights and responsibilities for the care of children unless it finds, based on facts that have arisen since the prior decree or that were unknown to the court at the time of the prior decree, that a change has occurred in the circumstances of the child, the child's residential parent, or either of the parents subject to a shared parenting decree, and that the modification is necessary to serve the best interest of the child. In applying these standards, the court shall retain the residential parent designated by the prior decree or the prior shared parenting decree, unless a modification is in the best interest of the child and one of the following applies: (i) the residential parent agrees to a change in the residential parent or both parents under a shared parenting decree agree to a change in the designation of residential parent. (ii) the child, with the consent of the residential parent or of both parents under a shared parenting decree, has been integrated into the family of the person seeking to become the residential parent. (iii) the harm likely to be caused by a change of environment is outweighed by the advantages of the change of environment to the child. (b) One or both of the parents under a prior decree allocating parental rights and responsibilities for the care of children that is not a shared parenting decree may file a motion requesting that the prior decree be modified to give both parents shared rights and responsibilities for the care of the children. the motion shall include both a request for modification of the prior decree and a request for a shared parenting order that complies with division (G) of this section. Upon the filing of the motion, if the court determines that a modification of the prior decree is authorized under division (E)(1)(a) of this section, the court may modify the prior decree to grant a shared parenting order, provided that the court shall not modify the prior decree to grant a shared parenting order unless the court complies with divisions (A) and (D)(1) of this section and, in accordance with those divisions, approves the submitted shared parenting plan and determines that shared parenting would be in the best interest of the children. (2) In addition to a modification authorized under division (E)(1) of this section: (a) Both parents under a shared parenting decree jointly may modify the terms of the plan for shared parenting approved by the court and incorporated by it into the shared parenting decree. Modifications under this division may be made at any time. the modifications to the plan shall be filed jointly by both parents with the court, and the court shall include them in the plan, unless they are not in the best interest of the children. If the modifications are not in the best interests of the children, the court, in its discretion, may reject the modifications or make modifications to the proposed modifications or the plan that are in the best interest of the children. Modifications jointly submitted by both parents under a shared parenting decree shall be effective, either as originally filed or as modified by the court, upon their inclusion by the court in the plan Modifications to the plan made by the court shall be effective upon their inclusion by the court in the plan. (b) the court may modify the terms of the plan for shared parenting approved by the court and incorporated by it into the shared parenting decree upon its own motion at any time if the court determines that the modifications are in the best interest of the children or upon the request of one or both of the parents under the decree. Modifications under this division may be made at any time. the court shall not make any modification to the plan under this division, unless the modification is in the best interest of the children. (c) the court may terminate a prior final shared parenting decree that includes a shared parenting plan approved under division (D)(1)(a)(i) of this section upon the request of one or both of the parents or whenever it determines that shared parenting is not in the best interest of the children. the court may terminate a prior final shared parenting decree that includes a shared parenting plan approved under division (D)(1)(a)(ii) or (iii) of this section if it determines, upon its own motion or upon the request of one or both parents, that shared parenting is not in the best interest of the children. If modification of the terms of the plan for shared parenting approved by the court and incorporated by it into the final shared parenting decree is attempted under division (E)(2)(a) of this section and the court rejects the modifications, it may terminate the final shared parenting decree if it determines that shared parenting is not in the best interest of the children. (d) Upon the termination of a prior final shared parenting decree under division (E)(2)(c) of this section, the court shall proceed and issue a modified decree for the allocation of parental rights and responsibilities for the care of the children under the standards applicable under divisions (A), (B), and (C) of this section as if no decree for shared parenting had been granted and as if no request for shared parenting ever had been made. Therefore, when a court is seeking to modify the designation of a residential parent, it must apply R.C. 3109.04(E)(1)(a), and find a change in circumstances prior to modifying a shared parenting plan. However, if the court is only seeking to change the method of implementation of a shared parenting plan, by changing its terms, it may apply R.C. 3109.04(E)(2)(b) and look only to what is in the best interest of the child.