How effective they are?
By observing someone closely can be realised which language should be used, or whether there is any disability or illness. If there is a learning disability or hearing or visual impairment then particular method or style of communication should apply for establishing effective communication.
Studying previous records or case histories
Previous records and case histories helps to identify the individual’s particular illness or disability and what kind of support does individual need to establish in order to accomplish the communication and language needs.
Communicating with family, friends and colleagues
Family, friends and colleagues who will have a great deal of information about a service user. They will have developed ways of dealing with communication and language possibly over a long period of time.