The Institute of Interim Management was formed and launched in April 2001, with the encouragement and support of the Interim Management Association (IMA) and the Chartered Management Institute (CMI).^[2]

Until August 2002, the IIM operated as a Special Interest Group through the CMI infrastructure. Given the IIM's growing need for greater emphasis on its own specialist area of management, and to facilitate a higher profile for Interim Management within industry and commerce, in August 2002, by mutual agreement with the CMI, the IIM pursued an independent status.^[3][4]

Activities for IIM Members and wider members of the Interim Management community are organised and run by its volunteer Board of Interim Managers and supporting community individuals.

A key activity since 2010, is the IIM Interim Management Annual Survey, which has grown in size and stature ever since. It covers key areas of interest to all interims such as numbers on assignment and off,male/female split and other demographics, average day rates as well as the Leading ISP rankings, a ranking of the top ISPs viewed from the lens of an Interim Manager.

The IIM organised 140+ events from its formation until the COVID-19 pandemic stopped them in their tracks. Since mid-2020, we have like many groups, moved online and typically run around 15 webinars, including a quarterly series for those new or interested in a career in Interim (Introduction to Interim Management) and 4-6 each year derived from the Annual Survey mentioned above. We aim to restart face to face events during H1 2024.

The following membership categories exist for Managers and Directors:.^[5]

• Companion (CIIM) - This category is awarded by the Board of the Institute for significant and sustained contribution to the Institute of Interim Management.^[6]
• Member (MIIM) - Requires a recognised management or professional qualification AND Is an established Interim manager, who can demonstrate to the satisfaction of the IIM a successful track record of Interim assignments AND Has at least three years' experience in board level/senior management positions OR May be without such a qualification but has at least six years' experience in board level/senior management positions.
• Associate (AIIM) - Requires a recognised management or professional qualification AND Can demonstrate a conscious career choice to be a professional Interim manager AND Has at least three years' experience in board level/senior management positions OR May be without such a qualification but has at least six years' experience in board level/senior management positions.
• Retired (RIIM) - Intended primarily for retiring and retired Members, this new category of membership offers continuity and involvement with the interim community beyond their fee earning time and an opportunity to "give something back" by getting involved with the running of IIM, working on projects and so on.

• Institute of Interim Management
• (LinkedIn group)