Explain how Zero Based Budgeting can help to control Budgetary slack in an organization of your choice?

Keeping in view the budgetary slack i.e the low estimation of Revenues and over estimation of expenses on the higher side the zero based budgeting may play a key role in maintaining a sustained level of budget for the company's expenses and level of income. Starting from zero for line of items the company can analyse its needs and cost from the beginning and also keeping in view the industry trends (comparing same as ours). this will give us a limit of budgeted expenses and revenues for the current year, which can be further be utilized for management decision making.