From Pave:

Here are tips for getting ready for an assessment with the Developmental Disabilities Administration (DDA), which is managed by the Washington State Department of Social and Health Services (DSHS). Be sure to send information to the DDA case manager ahead of time and keep a copy. If you save the assessment electronically in Word/Google Documents, it can be easily reviewed and updated any time.

https://wapave.org/how-to-prepare-for-a-dda-assessment/