KM3 Physics and Software Scientific Motivation This part of the effort is aimed at three major goals: Determine the Science of Interest and Return Neutrino Physics Neutrino Astrophysics Simulations of events/physics and detector Software for reconstruction of events, display of events, etc. KM3 Software System Concept Current Status of Effort Detailed MC (generates OM hit distributions) Complete Stage 1 (particle generation) complete Stage 2 (track / OM hit generation) Very far along Stages 3 and 4 (PMT physics, triggering) Just beginning Stage 5 (Reconstruction) Not yet started Event Display/Visualization yet started KM3 Software System Goals The KM3 software effort has for its goals the following outputs The Monte Carlo program, documentation, major results and test cases Simulation of the potential results from a km-scale neutrino detector Muon energy resolution Electron energy resolution $\nu_\tau$ energy resolution and flavor separation Estimate on the density of detectors (OMTs) needed to detect WIMPS and other items of HEP interest. Reference to Papers relating to the KM3 electronics and digital optical module: Title: Simulation Software and Results for km-scale neutrino detector Authors: Douglas Lowder et al. A description of the simulation software, tests cases, and results. Title: Simulations of Site Optical Properties Authors: William Chinowsky et al. Predictions and requirements for site optical properties measurements.