The most significant barrier to effective planning is change. Effective planning strategies typically include changes, both real and perceived, to people, systems, processes and structure. This can be highly disruptive to an organization.
People may fear their roles within an organization diminishing or disappearing altogether due to anticipated changes. System technologies may need an overhaul to accommodate the new strategy, and this could affect the ability of employees to do their jobs.
Organizational structure may also be revamped, shifting the chain of command as old departments within an organization are eliminated and new ones are created. Processes will also be under scrutiny during effective planning, and concerns may be raised about how implementing more effective processes could phase out specific jobs.