arxiv ref: 1711.03319Title: Parton Shower and NLO-Matching uncertainties in Higgs Boson Pair ProductionAuthors: S. Jones, S. KuttimalaiNode: ALU-FRESRs: ESR8Work Packages: WP2: Predictions and simulations of signal and backgroundMilestones: M2.1.1 Specialised codes for the SM-like Higgs boson scenarioM2.1.2 Better control of theoretical uncertainties for the SM-like Higgs boson scenario