4MOST Scientific Operations
C.J. Walcher, M. Banerji, C. Battistini, C.P.M. Bell, O., Bellido-Tirado, T. Bensby, J.M. Bestenlehner, T. Boller, J. Brynnel, A., Casey, C. Chiappini, N. Christlieb, R. Church, M.-R.L. Cioni, S. Croom, J., Comparat, L.J.M. Davies, R.S. de Jong, T. Dwelly, H. Enke, S. Feltzing

TL;DR
The 4MOST instrument is a multi-object spectrograph designed for simultaneous Galactic and extragalactic observations, with unique operational features and a consortium-driven service model within ESO's facility framework.
Contribution
This paper details the operational model and features of 4MOST, emphasizing its survey capabilities and consortium-based service delivery within ESO.
Findings
4MOST enables simultaneous multi-survey observations.
It incorporates distinct operational features for survey efficiency.
The consortium provides both instrument and service to the community.
Abstract
The 4MOST instrument is a multi-object spectrograph that will address Galactic and extragalactic science cases simultaneously by observing targets from a large number of different surveys within each science exposure. This parallel mode of operation and the survey nature of 4MOST require some distinct 4MOST-specific operational features within the overall operations model of ESO. The main feature is that the 4MOST Consortium will deliver, not only the instrument, but also contractual services to the user community, which is why 4MOST is also described as a facility. This white paper concentrates on information particularly useful to answering the forthcoming Call for Letters of Intent.
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