Wikipedia provides a fairly comprehensive definition: “Interim management is the temporary provision of management resources and skills. Interim management can be seen as the short-term assignment of a proven heavyweight interim executive manager to manage a period of transition, crisis or change within an organization. In this situation, a permanent role may be unnecessary or impossible to find on short notice. Additionally, there may be nobody internally who is suitable for, or available to take up, the position in question.[1]”. For more information: https://en.wikipedia.org/wiki/Interim_management