The psychologist investigates the ideal construction of the self, i.e.
Today it investigates why modern candles don't fit into older candlesticks.
The staff then investigates the account and if it's not legit, they remove it.
The company also investigates fraud, saving customers millions.
In the Ethics to Eudemus, as Porphyry properly called the Eudemian Ethics, Aristotle in the first four books successively investigates happiness, virtue, the voluntary and the particular moral virtues, in the same order and in the same letter and spirit as in his Ethics to Nicomachus.