Early Learning STEM Australia Early Learning STEM Australia (ELSA) is a play-based digital learning program for children in preschool to explore science, technology, engineering and mathematics (STEM). ELSA allows children to play, experiment and make sense of the world around them – which is part of STEM, and also part of being a child. ELSA’s STEM Practices encourage children to ask questions, make predictions, experiment, and reflect on what happened and why.