1 INTRODUCTION

2 THE DES YEAR 1 DATA
2.1 Photometric Catalog
2.2 Cluster catalog
2.3 Shear catalogs
2.4 Photometric redshift catalog

3 STACKED LENSING MEASUREMENTS
3.1 Mass density profiles
3.2 Covariance matrices

4 SYSTEMATICS
4.1 Shear systematics
4.2 Correction for cluster members in the shear catalog
4.3 Photometric redshift systematics

5 THE STACKED LENSING SIGNAL
5.1 Surface density model
5.2 Miscentering correction
5.3 Multiplicative corrections
5.4 Stacked mass corrections
5.5 The complete likelihood
5.6 Stacked cluster masses

6 THE MASS–RICHNESS–REDSHIFT RELATION
6.1 Modeling the mass–richness relation
6.2 Mass covariance
6.3 Likelihood for the mass–observable relation

7 COMPARISON TO RESULTS IN THE LITERATURE

8 SYSTEMATIC IMPROVEMENTS FROM DES SV TO DES YEAR 1, AND FROM YEAR 1 TO YEAR 5

9 SUMMARY AND CONCLUSIONS