People who do not speak English well or at all maybe at a disadvantage in their learning task. This can be very important, particularly for children or for those with very severe disabilities. This list is not exhaustive, but it does show that training requirements need to be considered very carefully. This is available on CD-ROM in the form of interactive multimedia training. People can work at times which best suit them.
People can work for as short or long a period as they choose.
People can review their training when and as often as they like. The training takes place in the comfort of the person's home.