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The Cluster Lensing And Supernova survey with Hubble (CLASH) is a 524-orbitmulti-cycle treasury program to use the gravitational lensing properties of 25galaxy clusters to accurately constrain their mass distributions. The survey,described in detail in this paper, will definitively establish the degree ofconcentration of dark matter in the cluster cores, a key prediction of CDM. TheCLASH cluster sample is larger and less biased than current samples ofspace-based imaging studies of clusters to similar depth, as we have minimizedlensing-based selection that favors systems with overly dense cores.Specifically, twenty CLASH clusters are solely X-ray selected. The X-rayselected clusters are massive (kT > 5 keV; 5 - 30 x 10^14 M_solar) and, in mostcases, dynamically relaxed. Five additional clusters are included for theirlensing strength (Einstein radii > 35 arcsec at z_source = 2) to furtherquantify the lensing bias on concentration, to yield high resolution darkmatter maps, and to optimize the likelihood of finding highly magnifiedhigh-redshift (z > 7) galaxies. The high magnification, in some cases, providesangular resolutions unobtainable with any current UVOIR facility and can yieldz > 7 candidates bright enough for spectroscopic follow-up. A total of 16broadband filters, spanning the near-UV to near-IR, are employed for each20-orbit campaign on each cluster. These data are used to measure precise(sigma_phz < 0.02(1+z)) photometric redshifts for dozens of newly discoveredmultiply-lensed images per cluster. Observations of each cluster are spreadover 8 epochs to enable a search, primarily in the parallel fields, for Type Iasupernovae at z > 1 to improve constraints on the time dependence of the darkenergy equation of state and the evolution of such supernovae in an epoch whenthe universe is matter dominated.

Cluster Lensing And Supernova survey with Hubble (CLASH): An Overview