Attention is a limited resource, not a moral quality. Young children are still developing the ability to filter distractions, hold a goal, and return after an interruption. What looks like they won’t focus is often really, they can’t hold this much, for this long, in this environment.
Ormrod’s work on learning and self-regulation helps here, learners who plan a course of action and monitor progress do better and those skills are taught, not assumed. A vague sit and work is a huge ask. A clear first step, a visible timer, and a short span match how attention grows.
Motivation and emotion sit underneath focus, too. If the task feels impossible, which is low self-efficacy, or pointless, which means they give it low value, the mind looks for exits. Anxiety and frustration also steal working memory. And every ping, sibling, and open tab is a cue pulling them off the trail. Cueing and setting events, the conditions around the work, matter as much as the child.