Primary law and terminology
RCW 26.09.187 and 26.09.191 (parenting plan). In Washington, courts generally describe the schedule as a parenting plan. The court's decision is based on the child's best interests, not simply a parent's preferred percentage of time.
Joint custody and parenting time
No presumption; the plan allocates residential time and decision-making using statutory factors and restrictions.
Child preference
The wishes of a sufficiently mature child are a residential factor.
Relocation and move-away cases
RCW 26.09.430-.480 requires 60 days' notice, with a rebuttable presumption that the intended relocation is permitted.
Changing an existing order
RCW 26.09.260 requires a substantial change plus one of the statutory grounds.
Where to file
Under the UCCJEA the child generally must have lived in the state for the 6 months before filing (or since birth, if younger). Washington requires a Parenting Plan (WPF DR 01.0400) in every case with minor children.