Level Changes Most organizational changes have their major effects at the group level. This is because most activities in organizations are organized on group basis. The groups could be departments, or informal work groups. Changes at the group level can affect work flows, job design, social organisation, influence and status systems, and communication patterns. Managers must consider group factors when implementing change. Informal groups can pose a major barrier to change because of the inherent strengths they contain. Formal groups can resist change, as exemplified by the resistance demonstrated by unions to the changes proposed by management. Because of the powerful influence that groups can have on individuals, effective implementation of change at the group level can frequently overcome resistance at the individual level.