"Close observation" means carefully watching, paying attention to, or studying someone or something in great detail.
Sentences with «close observation»
Based on close observation of animal development, scientists had assumed that a cell's fate is assigned early in life — and is irreversible. (sciencemag.org)
Attention to detail through close observation of other personnel is required. (careerbuilder.com)
You should be able to determine the quality of the dog's temperament — the single most important thing when choosing a pet, by close observation and interaction with the dog. (komondorclubofamerica.org)