Eastside Healthcare Network operates in a highly volatile healthcare market characterized by frequent regulatory changes and constant adjustments to reimbursement rates. The finance team currently prepares annual budgets every October for the upcoming calendar year. However, by March or April, these budgets often become outdated and fail to reflect current market conditions. Department managers frequently express frustration because they are held accountable for targets that quickly become unrealistic, while executives find it difficult to make informed strategic decisions based on financial projections that are no longer relevant. Which budgeting approach would best help Eastside Healthcare Network adapt to its volatile operating environment?