Ongoing wide area galaxy surveys are producing large volumes of data, placing impressive constraints on our cosmological understanding of theUniverse, even rivaling the precision delivered by cosmic microwavebackground (CMB) experiments. The statistical power of the available data sets can only be harnessed with careful control of potential sources of systematic error that can affect both the observational measurements and the theoretical modelling. I will set the scene by describing current results from the Kilo-Degree Survey (KiDS) and the Dark Energy Survey (DES), both of which have recently completed intricate analyses combining different measurements of weak gravitational lensing and galaxy clustering. I will discuss how we can characterize some of the more precarious moving parts of the analysis (e.g. photometric redshifts) with information from overlapping spectroscopic and CMB data sets. I will conclude with a look forward to a bright future with the Wide-Field Infrared Survey Telescope and the Large Synoptic Survey Telescope.