Which of the following should NOT be undertaken at the very beginning of the interviewing process?

A) Explaining the worker's role to the client
B) Encouraging client feedback on purpose
C) Goal attainment scaling
D) Stating the usefulness of the intervention process

Goal attainment scaling is a method used to set personal goals for the client and measure the outcome of interventions. It is not typically undertaken at the very beginning of the interviewing process, as it requires a clear understanding of the client's issues, needs, and strengths, which are usually identified through initial discussions and assessments.