Slitting processes are used since years to increase the productivity of rolling mills, reducing at the same time the overall production costs. This technology is used mainly for the production of reinforcing bars, but successful applications exist also for round bar production. Without making major changes on mill layout, multi-slitting process enables to produce up to 4 bars starting from one billet. Danieli Morgardshammar, world leader in the supply of rolling mills for long products, is a front-runner in slitting technology since its first applications. In order to grant a smooth start-up and increase the reliability of multi-slitting processes, in particular for four strand slitting, Danieli Morgardshammar has developed different solutions and improvements to be applied along the mill. Starting from process designing, Danieli Morgardshammar package includes dedicated guide system, loopers, conveyors, alignment devices, water cooling manifolds and other equipment. Special training and start-up assistance can be provided with the intervention of specialized process, mechanical and automation engineers. This paper will present the modifications that Danieli Morgardshammar experienced to be necessary to improve multi-slitting processes, presenting the results of the latest applications realized during the latest mill start-up.