Final answer:
Implementation as the fourth step of the nursing process begins after a care plan has been developed and there is mutual goal setting between the nurse and the patient.
Step-by-step explanation:
The fourth step of the nursing process is implementation, which begins after a care plan has been developed. During the implementation phase, the nurse carries out the planned interventions to promote the patient's health and well-being. It is important for the nurse to ensure that the care plan is tailored to the patient's needs and that there is mutual goal setting between the nurse and the patient.