Better support for collaborations preparing for large-scale projects: the case study of the LSST Science Collaborations by Bianco, FB, Banerji, M, Blum, R, Bochanski, J, Brandt, WN, Burchat, P, Gizis, J, Ivezić, Z, Keaton, C, Kaviraj, S, Loredo, T, Mandelbaum, R, Marshall, P, McGehee, P, Schafer, C, Schwamb, ME, Sokoloski, JL, Strauss, MA, Street, R, Trilling, D, Verma, A