Abstract.
Contents

1 LSST as a Dark Energy Experiment
1.1 Introduction and overview
1.2 Description of the LSST system
1.3 Planned survey strategy and delivered data products
1.4 Overview of dark energy science
1.5 Precursor surveys
1.6 Gains from LSST

2 The LSST Dark Energy Science Collaboration
2.1 Need for the Collaboration
2.2 Governance and organization
2.3 Working Groups
2.4 Development and execution of LSST DESC policies and procedures
2.5 Membership
2.6 General structure of work plan for next three years

3 The Analysis Framework and Key Systematics for Investigation
3.2 Large-scale structure
3.3 Supernovae
3.4 Clusters of galaxies
3.5 Strong lensing
3.6 Theory and joint probes
3.7 Photometric redshifts and other common issues across multiple probes

4 Simulation Tools and Technical Infrastructure
4.1 Simulations
4.2 Computing infrastructure
4.3 Technical coordination

5 Detailed Work Plan
5.1 Weak lensing
5.2 Large scale structure
5.3 Supernovae
5.4 Clusters
5.5 Strong lensing
5.6 Theory and joint probes
5.7 Photometric redshifts
5.8 Cross-working group tasks
5.9 Simulations improvements and development
5.10 Development of a software framework
5.11 Development of a computing model
5.12 Technical coordination