Final answer:
The evaluation step of the nursing process addresses the effectiveness of the nursing plan by assessing the patient's progress and comparing it to the expected outcomes.
Step-by-step explanation:
The step of the nursing process that addresses the effectiveness of the nursing plan is the evaluation step.
During the evaluation step, the nursing assistant assesses whether the nursing plan has achieved its intended goals and outcomes. This involves reviewing the patient's progress, comparing it to the expected outcomes, and determining if any adjustments need to be made to the plan.
For example, if a patient's goal was to improve pain management, the nursing assistant would evaluate whether the pain management interventions implemented in the nursing plan have effectively reduced the patient's pain.