https://www.selleckchem.com/products/tp-0903.html Educators require validated tools to assess learner competency in simulation-based mastery learning. We previously created a simulation to incorporate crisis resource management skills after a needs assessment of our pediatric residency program. We present the development of and content evidence for validity of a task list with time-to-task initiation designed to aid in rapid cycle deliberate practice (RCDP) debriefing and assessment of pediatrics resident learners. Five board-certified pediatricians developed the initial task list with 30 tasks. We used the Delphi technique to seek content evidence for validity of the initial task list using 17 board-certified pediatricians at 7 institutions across the United States. After finalizing the task list, we video recorded 3 pediatric experts performing the tasks in a simulation. We then used the Delphi technique to establish and to attain agreement on time-to-task initiation. We calculated Cronbach α coefficient to measure internal consistency of the expert recies in delivery of RCDP for a common pediatric resuscitation scenario. The impact of booster training on pediatric resuscitation skills is not well understood. Rapid cycle deliberate practice (RCDP) to supplement pediatric advanced life support (PALS) training is beginning to be used to improve resuscitation skills. We tested the impact of booster RCDP training performed at 9 months after initial RCDP training on pediatric resuscitation skills of pediatric residents. This study evaluated the impact of a 9-month RCDP booster training on PALS skills compared with usual practice debriefing (plus/delta) after an initial RCDP training session for PALS-certified pediatric interns. All pediatric interns at a single institution were invited to a 45-minute RCDP training session after their initial PALS certification. The PALS performance score and times for key events were recorded for participants immediately before and aft