The goal of this clinical trial is to compare the effect of the Graded Repetitive Arm Supplementary Program (GRASP) with the usual care on upper extremity function in individuals with stroke.

The main questions it aims to answer are:

• Compare the effectiveness of the GRASP program delivered by train occupational therapists
• Explore the patients' and therapists' experiences of the GRASP program using interviews and surveys

Stroke participants will receive either the GRASP program or Usual Care for four weeks (3 sessions/week). Stroke participants will be evaluated before, immediately after, and 3 months after the intervention. Therapist participants will be trained for the delivery of the GRASP program. Interviews and surveys/questionnaires will be administered to understand patients' and therapists' perspectives on the implementation of the GRASP program.

Inclusion Criteria:

• 1) are aged 20 years or older, 2) stroke onset > 3 months, 3) have upper extremity hemiparesis due to the first-ever stroke, (4) have some voluntary movement in the affected UE, including the ability to lift the affected arm to chest level and hold for 5 seconds, some ability to extend the affected wrist, and some ability to grasp and release an object such as a cup handle, and 5) are able to follow 2-step instructions.

Exclusion Criteria:

• 1) orthopedic conditions affecting the arm/hand or other neurological conditions, 2) severe pain that prevents movement in the affected arm and hand, and 3) unstable medical status.