I. INTRODUCTION

II. DARK ENERGY SURVEY YEAR 3 DATA  
A. Shape measurement  
B. The shape catalog  
C. The lens sample  

III. REDSHIFT CALIBRATION  
A. Methodology  
B. Deep Fields and redshift samples  

IV. SHEAR CALIBRATION

V. COSMOLOGICAL SIMULATIONS

VI. COSMIC SHEAR MEASUREMENT  
A. Correlation function measurements  
B. Covariance Matrix  
C. Mitigating observer bias  

VII. MODELING AND ANALYSIS CHOICES  
A. Cosmic shear signal  
B. Intrinsic Alignments  
C. The matter power spectrum and baryonic effects  
D. Modeling blending  
E. Redshift uncertainty  
F. Bayesian Inference  
G. An ‘Optimized’ analysis  

VIII. COSMOLOGICAL CONSTRAINTS  
A. Fiducial results  
B. ΛCDM -Optimized results  

IX. INTERNAL CONSISTENCY  
A. Internal consistency methodology  
B. Tomographic redshift bins  
C. Angular ranges  
D. ξ+ versus ξ−  
E. Previous DES results  

X. ROBUSTNESS TO REDSHIFT CALIBRATION  
A. Redshift sample to C  
B. Redshift method  
C. Modeling redshift uncertainty  

XI. ROBUSTNESS TO BLENDING AND SHEAR CALIBRATION

XII. WHAT LIMITS LENSING COSMOLOGICAL PRECISION?

XIII. CONCLUSIONS