A jargon-free guide to the skills that run an ordinary day, and why a bad day isn’t a character flaw.
Quick Answer
Executive function is the set of mental skills you use to run an ordinary day: holding information in mind, resisting distractions and urges, and switching plans when things change. Researchers group them as working memory, inhibition and cognitive flexibility. It isn’t a measure of intelligence, and struggling with it doesn’t automatically mean ADHD.
What does executive function actually mean?
Harvard’s Center on the Developing Child calls it the brain’s air traffic control: it helps you hold information in mind, focus your thinking, filter distractions and switch gears. Researchers describe executive functions as top-down control processes we use when running on autopilot would be unwise, not enough, or impossible (Diamond, 2013).
What are the three core executive function skills?
| Skill | In plain words | Everyday example |
|---|---|---|
| Working memory | Holding information in mind and working with it | Remembering a request while you look up an account |
| Inhibition | Resisting a strong urge or a distraction | Not opening your phone mid-conversation |
| Cognitive flexibility | Shifting your plan when things change | Rerouting calmly when your usual road is closed |
These skills are related but separable (Miyake et al., 2000), so you can be strong at one and still struggle with another.
Is executive function the same as intelligence or ADHD?
No to both. In a meta-analysis of 83 studies, weaker executive function in ADHD was not explained by differences in intelligence or academic achievement. Effect sizes were medium (.46 to .69), and the authors concluded these weaknesses are neither necessary nor sufficient to cause all cases of ADHD (Willcutt et al., 2005).
Why do I have good days and bad days?
Stress, lack of sleep, loneliness and lack of exercise each impair executive functions, and they can be improved with practice (Diamond, 2013). A “bad day” may be a sign of low fuel, not a flaw in you.
How do I spot it in my own day?
- Name the skill. Did you lose the thread, give in to an urge, or get thrown by a change?
- Check the fuel. Which is lowest this week: sleep, stress, connection or movement?
- Move the memory job out of your head: a calendar, a note, a list by the door.
- Change one thing for a week, then notice what changes.
Want supports that fit your real days?
Book a free discovery call to turn this into a real plan through ADHD and executive function coaching. We'll look at how executive function shows up in your days and build routines that stick.
ADHD coach in training, enrolled in the ADD Coach Academy's ICF-accredited coach training program and approved to work with clients under its practicum. Coaching is not therapy or medical treatment.
Sources: Center on the Developing Child at Harvard University (n.d.), InBrief: Executive function; Diamond (2013), Annual Review of Psychology; Miyake et al. (2000), Cognitive Psychology; Willcutt et al. (2005), Biological Psychiatry. Full references are in the free eBook. This post is for education only and is not a substitute for diagnosis or treatment.
