IUG Recommendation 24: Multi-Year Key Programs IUG encourages multi-year key programs, with observations spanning two AOs. In the first year of such a key program, a normal 5 page long justification for a key program is to be submitted. This justification should describe the science case and technical feasibility for the total observing time requested. In the following AO, this initial proposal is to be followed up by a "confirmation proposal" of up to two pages in length, in which the timeliness of the science context of the original proposal is to be discussed in light of the scientific progress since its submission. Where possible, the feasibility of the original proposal should be updated based on the already taken data. During the subsequent AO, TAC is to be provided with the original proposal from the previous AO.