Final answer:
The Delphi method is a structured process involving experts making forecasts for HR planning in a firm.
Step-by-step explanation:
The workforce forecasting method that involves a structured process where a group of experts makes human resource forecasts for a firm is known as the Delphi method. This method is recognized for its systematic approach to generate consensus among experts through a series of questionnaires and rounds of feedback, allowing for a diverse range of knowledge and opinions to informedly predict future HR needs without the need for face-to-face meetings. Other options listed, such as replacement charts, scenario planning, nominal group technique, and Markov models, also play various roles in human resource planning and forecasting but differ in their approaches and specific uses.