Write up a proposal for how LSST DM should test and validate systematics control for weak-lensing measurements.

We should adopt the modern standards in measuring systematics tests for weak-lensing community.

I've had a series of discussion with Mike Jarvis to try to learn about where things are in 2019. In brief, Mike summarized the state of the art as the rho-statistics used in DES and HSC (see papers below). The TE

statistics as defined in the SRD are not inconsistent with these, but rho_1 and rho_2 are not inconsistent with the TEx statistics of the SRD, but are a different algebraic formulations.
1. Jarvis+16
https://ui.adsabs.harvard.edu/#abs/arXiv:1507.05603
"The DES Science Verification weak lensing shear catalogues"
Tests you can do on real data. See specifically Section 3.4 PSF Model Errors (rho_1 – rho_5).

2. Mandelbaum+18
https://ui.adsabs.harvard.edu/#abs/arXiv:1710.00885
"Weak lensing shear calibration with simulations of the HSC survey"
Tests you can do on simulated images. It will take more thought to decide how to include these in the LSST DM testing plan.

This will not involve any consideration of a modification to the SRD, but will provide in a lower derived-requirements document additional tests to perform to connect to the language of (at least an important subset of) the weak lensing community.