The NDIS often espouses a "key worker" model for delivering multi- or trans-disciplinary therapy for children with autism or developmental delay. Sometimes, the expectation of key worker services are written into NDIS plans. 

The NDIS does not describe what this means. Searching the NDIS website finds no useful information. The NDIS's response to a Freedom of Information request for their information about key worker model showed they

decided to refuse access to the information you have requested on the basis that the documents are non-existent or unlocatable pursuant to section 24A of the FOI Act.

While this key worker model has been suggested, it is not a reality. Allied health professionals are not trained for the role. The NDIS has not sought training for allied health professionals to do the role. 

A recent document says

Lead practitioner 

An allied health, developmental or early childhood educator who is the main professional working with the family. This is sometimes called a Key worker. They help coordinate the team around the child, provide information and advice, emotional support, identify and address needs and support the family to develop self-advocacy skills. 

Some allied health professionals have figured out how to work together. Some have taken on such a role with varied degrees of success. 

Few allied health professionals are taught formally to train and supervise NDIS-funded therapists. 

The NDIS key worker service model is just a bureaucratic fantasy. Attempting to find such a service using the NDIS Provider finder service does not produce a meaningful result.