Slender System Connection This option enables user to perform coupled analysis which means simultaneous analysis of vessel motions and mooring/ riser dynamics. The vessel load model may account for wind, wave and current forces, which are applied as nodal loads. For further description of vessel load model, confer SIMO user manual. Note that his option requires access to the computer program SIMO. An artificial stiffness may be given for each slender system connection, this is applied only in static analysis. This may be used to improve convergence to limit displacements in static analysis, typically for very soft modes like rotation of turret. Boundary change in static or dynamic analysis is however the preferred method to improve convergence in such cases.