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Cosmology is one of the four science pillars of LSST, which promises to betransformative for our understanding of dark energy and dark matter. The LSSTDark Energy Science Collaboration (DESC) has been tasked with derivingconstraints on cosmological parameters from LSST data. Each of the cosmologicalprobes for LSST is heavily impacted by the choice of observing strategy. Thiswhite paper is written by the LSST DESC Observing Strategy Task Force (OSTF),which represents the entire collaboration, and aims to make recommendations onobserving strategy that will benefit all cosmological analyses with LSST. It isaccompanied by the DESC DDF (Deep Drilling Fields) white paper (Scolnic etal.). We use a variety of metrics to understand the effects of the observingstrategy on measurements of weak lensing, large-scale structure, clusters,photometric redshifts, supernovae, strong lensing and kilonovae. In order toreduce systematic uncertainties, we conclude that the current baselineobserving strategy needs to be significantly modified to result in the bestpossible cosmological constraints. We provide some key recommendations: movingthe WFD (Wide-Fast-Deep) footprint to avoid regions of high extinction, takingvisit pairs in different filters, changing the 2x15s snaps to a single exposureto improve efficiency, focusing on strategies that reduce long gaps (>15 days)between observations, and prioritizing spatial uniformity at several intervalsduring the 10-year survey.

Optimizing the LSST Observing Strategy for Dark Energy Science: DESC Recommendations for the Wide-Fast-Deep Survey