Engage commitment from those people who will be affected by the plan
This is how you Start and ensure Support for planning, and the implementation of the plan. The people you need to include are primarily the Chief Executive Officer and their immediate reporting managers, and the layer of staff or management at one remove from the Chief Executive Officer (CEO).
In turn the CEO must engage with the governing body, who in turn engage the beneficiary groups they are there to represent. Other stakeholder groups may possibly be affected by the implementation of the strategic corporate plan in the operation of the enterprise. Their interests must be respected. It must be remembered that the processes for engaging people operate in various ways in all the other stages of the planning process.