These are the standard ISR Roll-back-to-Float lessons discussed on the ISR website; for children 6 months to 18 months. These lessons usually take six weeks to complete. 

These are the standard ISR Swim-Float-Swim lessons discussed on the ISR website; for children 19 months to 6 years old. These lessons usually take six weeks to complete. (Roll-back-Float last year then you register as a Swim-Float-Swim) 

These lessons are for children who have already completed survival lessons (swim-float-swim; NOT Roll-back-Float). As the name implies, these lessons enable the children to "refresh" the skills that they have already learned. Students attend lessons Monday-Friday. Since these skills are not new to the children, refresher lessons usually take approximately three weeks. NOTE**Refresher lessons ARE NOT for previous roll-back-to-float students; Please choose the Swim-Float-Swim Lessons. These lessons should take approximately 4-6 weeks.