Your child managed a task last week and cannot seem to manage it today. It is reasonable to wonder what changed. A previous success does not tell us what support they need this time.
Sleep, health, surroundings, and the demands of the day can affect how a task goes. The same is true for adults.
Consider anxiety, fatigue, sensory discomfort, communication needs, and difficulty getting started or organizing the steps. These are possibilities to explore, not conclusions to draw from one difficult occasion.
Context is part of the skill
Suppose a child speaks fluently at home but is nearly silent at school. That difference deserves assessment rather than a judgment about willpower. Anxiety, communication demands, relationships, and the setting may matter; this example alone cannot identify the cause or diagnose selective mutism. A context-sensitive assessment asks what makes communication easier and what support is needed.
A student may understand advanced material and still struggle with starting, shifting, or organizing work. High intelligence does not rule out ADHD-related impairment, although good grades and difficult homework do not establish ADHD either. Antshel et al. (2007)
Composure at school and distress at home can both be real. Different settings, demands, observers, and times of day may contribute. The difference is worth investigating; it does not prove masking, or tell us which setting is safe. Stratis & Lecavalier (2015)
Compare easier and harder moments
The goal is not to lower expectations every time performance varies. It is to map the variables. When is the skill easiest to access? What happens just before it disappears? Does noise matter? Time pressure? Audience? Hunger? A transition? The number of verbal steps? The possibility of being corrected? Patterns give us more useful information than arguments about effort.
Record the conditions that made the task easier. A note such as “started after we wrote down the first step” is more useful than a judgment about effort.
What the evidence can—and can’t—tell us
These studies concern impairment, observer differences, and a specific executive-function program. They support looking beyond a single performance, but do not establish the cause of an individual child’s changing abilities. A new or sustained loss of skills needs clinical assessment rather than an assumption of fluctuating access.
Research & guidance
- Antshel et al. (2007). Is attention deficit hyperactivity disorder a valid diagnosis in the presence of high IQ? ↗
Observational comparison of high-IQ children with and without ADHD.
- Stratis & Lecavalier (2015). Informant agreement for youth with autism spectrum disorder or intellectual disability: a meta-analysis ↗
Synthesis of 49 studies; reports from different observers agree only moderately on average.
- Kenworthy et al. (2014). Randomized controlled effectiveness trial of executive function intervention for children on the autism spectrum ↗
School-randomized trial in elementary-school children; findings concern the tested program.
Sources checked September 16, 2026. Wording revised October 12, 2026. This is a research-informed essay, not a systematic review or individual medical advice.