Some methods, - such as just-in-time and agile and direct deliveries - inevitably lead to smaller, more frequent deliveries. This suggests some movement away from large trucks and into smaller delivery vehicles, which are inherently less efficient. However, it has spurred the growth of parcel delivery such as FedEx, UPS and DHL - and it has encouraged operators to look for efficiencies, such as round-the clock deliveries to unattended destinations, better planning of deliveries, and higher vehicle utilization.