Digitization of processes is one of the important elements of Industry 4.0, which is becoming an increasingly popular form of introducing improvements in production processes. The aim of the article is to study a modern solution aimed at improving the workflow, which is the digitization of assembly processes. The article raises issues related to the introduction of digital instructions to the assembly process on the example of pump assembly. The focus was mainly on the comparison of work efficiency by comparing the time of product implementation using traditional paper and digital instructions. The impact of the use of programmable tools on the time of order completion and the achievement of the "zero defects" effect was also examined. The study also allowed to determine the economic benefits of introducing digital instructions.