A minimum of two rotations is required, and students can choose a lab anytime after April 1. Recommendations of rotation length and number differ by Home Program, with students able to opt for shorter rotations to gain a wider breadth of experience. All students are strongly encouraged to choose a thesis lab by the end of their third quarter (June). See your Home Program's handbook for specific requirements and recommendations.
If you choose a lab outside of your original Home Program, you may transfer into the Home Program with which the thesis advisor is affiliated or stay within your original Home Program. This decision is made jointly by the student, the thesis advisor, and the graduate advisors in the respective Home Programs, with optimization of the student's training as the primary consideration.
For information about choosing rotations and thesis labs, see Choosing Rotations and a Thesis Lab.