There is disclosed a technique for determining parameters of a long-term lease of an asset. The method involves determining a set of payments defining an amortisation path from an initial value (A) to a final residual value (M) of said asset over a long-term lease period, and determining a plurality of sets of short-term lease payments such that the plurality of sets of short-term lease paths define respectively one or more interim short-term lease paths (ADF, DGI, GJL) and a final short-term lease path (JM), each interim short-term lease path (ADF, DGI, GJL) consisting of an amortisation portion that corresponds to said amortisation path (AD, DG, GJ) for a respective short-term lease period and a termination amortisation portion (DF, GI, JL) that links the amortisation portion to a short-term termination value falling on a residual value path to said final residual value at a position such that the short-term lease corresponding to the short-term lease path satisfies a predetermined value condition, and the final short-term lease path (JM) consisting of an amortisation portion, whereby the plurality of amortisation portions of the interim and final short-term lease paths correspond collectively to said amortisation path.