There are three main types of organizational development interventions: individual, group, and organizational. The document outlines several examples of interventions for each type. An effective OD intervention process involves entering and contracting, diagnosis, designing the intervention, leading and managing change, and evaluating and institutionalizing the changes. Interventions can be categorized into four buckets: human process, strategic, human resource management, and technostructural. Organizations should be able to identify the need for interventions early to address issues with minimal effort before they escalate.