Incremental sheet forming (ISF) is a relatively new forming process for small batch production and prototyping.In ISF,a blank is shaped by the CNC movements of a simple tool in combination with simplified dies.The deformation is governed by the fact that the plastic zone is strictly limited to the contact region between the tool and the work piece.As a consequence,the standard forming strategies show severe thinning and often an inhomogeneous wall thickness distribution that strongly depends on the inclination of the part surface.This limits the range of possible wall inclination to approximately 65 degrees and requires that a given part must be checked for feasibility prior to manufacture.If the design is not feasible,the tool path must be optimized such that excessive thinning can be avoided,which demands for fast and reliable simulation methods to reduce the experimental effort.Standard forming strategies do not allow for wall angles and sheet thicknesses.The geometrical accuracy of formed parts is limited because current process planning tools and forming strategies do not allow for a compensation of springback.The present paper reviews some approaches that were proposed in the past regarding both process limits and process modeling.In addition,the latest developments aiming at surmounting the process limits are detailed,including a process combination of ISF and stretch forming.A simplified process model will be presented that yields drastically reduced calculation times compared to FE simulations.