After the investigation and interview, he found that what satisfied the employees belonged to the work itself or the content of the work: what dissatisfied the employees belonged to the working environment or working relationship.
After the survey visit, he found that it was the work itself or the content of the work that satisfied the employees: what made the employees dissatisfied was in the working environment or in the work relationship.
After the investigation and interview, he found that what makes the employees satisfied belongs to the work itself or work content: what makes the employees dissatisfied belongs to the work environment or work relationship.