The archived DeltaMeco page on core values lists three principles that a manning agency chose to emphasise.
Quality
Supplying well-qualified seafarers depends on continuing investment in their training and development. See training and development.
Efficiency
An agency should work effectively. The page cites an accounts service offered to every client as standard, described on the accounts page.
Service excellence
The third value is attentive, traditional customer service, with feedback welcomed from clients.