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I present an overview of the JWST Advanced Deep Extragalactic Survey (JADES),a joint program of the JWST/NIRCam and NIRSpec Guaranteed Time Observations(GTO) teams involving 950 hours of observation. We will target two well-studiedfields with excellent supporting data (e.g., from HST-CANDELS): GOODS-North andSouth, including the Ultra Deep Field. The science goal of JADES is to chartgalaxy evolution at z > 2, and potentially out to z > 10, using the rest-frameoptical and near-IR though observations from $\approx$ 1 - 5 $\mu$m.Multi-colour NIRCam imaging with 9 filters will enable photometric redshiftsand the application of the Lyman break technique out to unprecedenteddistances. NIRSpec spectroscopy (with spectral resolving powers of R = 100,1000 & 2700) will measure secure spectroscopic redshifts of thephotometrically-selected population, as well as stellar continuum slopes in theUV rest-frame, and hence study the role of dust, stellar population age, andother effects. Measuring emission lines can constrain the dust extinction, starformation rates, metallicity, chemical abundances, ionization and excitationmechanism in high redshift galaxies. Coupling NIRCam and NIRSpec observationswill determine stellar populations (age, star formation histories, abundances)of galaxies and provide the information to correct their broad-band spectralenergy distribution for likely line contamination. Potentially we can searchfor signatures of Population III stars such as HeII. We can address thecontribution of star-forming galaxies at z > 7 to reionization by determiningthe faint end slope of the luminosity function and investigating the escapefraction of ionizing photons by comparing the UV stellar continuum with theBalmer-line fluxes.

Spectroscopy with the JWST Advanced Deep Extragalactic Survey (JADES) -- the NIRSpec/NIRCam GTO galaxy evolution project