Which student needs intervention based on their phonemic skills?

The student who needs intervention based on their phonemic skills is Ella, who blends and segments up to 3 sounds. Phonemic awareness is crucial for reading development, and students typically need to progress beyond blending and segmenting three sounds to ensure they have a solid foundation for more complex phonics skills that involve longer words and syllables.

In comparison, Tom demonstrates the ability to blend 4 sounds, indicating a stronger grasp of phonemic blending. Sam's ability to segment words with up to 5 sounds shows an even greater proficiency, which is above the expected level of development for most early readers. Jill's accurate blending of sounds also suggests that she has the necessary skills to continue developing her reading ability without requiring intervention.

Overall, Ella's current skill level suggests that additional support would help her advance in her phonemic awareness, crucial for her reading development.