EXAMPLE
Nearly every baby has the aptitude to start to crawl, typically between 6-10 months, then walk, then run somewhere between 18-24 months.
The inborn Potential to do something (skill) to a certain level (competency) to achieve something (capability).
EXAMPLE
Nearly every baby has the aptitude to start to crawl, typically between 6-10 months, then walk, then run somewhere between 18-24 months.