"To conduct an investigation" means to carefully and thoroughly gather information and evidence in order to find out the truth or solve a problem. Full definition
Assist in conducting an investigation into the crash and finding expert witnesses to make your case. (pricebenowitz.com)
Since the airline was in the process of conducting an investigation of the incident, it could not provide a detailed account on social media. (businessinsider.com)
Perform responsibilities of conducting investigations in case of emergency recruitment for the business. (members.climber.com)