CHA stands for Community Health Assessment. The interRAI-CHA is a very versatile assessment instrument in that it is constructed modularly. There is a very short Preliminary Screener that may be used at the beginning of the assessment process. There is a Core assessment and then there are four supplemental assessments which are; Functional Supplement (FS), Deaf Blind (DB), The Preliminary Screener contains an Assessment Urgency Algorithm (AUA). The AUA helps to determine if the client should proceed to the next step, which is the Core assessment.