In an era when AI tools such as chatGPT can craft codes following specific directions, aspiring data scientists or analysts need to develop robust higher-order reasoning and problem-solving capacity – skills less likely to be replaced by AI. Caselet, a bite-sized case study tool, facilitates self-paced online practice to expedite the development of Data Science Problem Solving (DSPS) skills for data science learners. Designed to bridge the gap between textbook data science knowledge and real-world problem-solving demands, Caselet practice is grounded in established learning science principles and augmented by intelligent coaching and learning engineering functions to ensure its effectiveness at a large scale.