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One particular activity that substantially affects the efficiency of material flow within supply chains, and which is located within the distribution centre, is order picking. The performance of an order picking system is typically determined by batching, picking sequence, storage policy, zoning, layout design, picking equipment and design of picking information. The main research problem in this paper was to investigate whether the sequence of order execution can have an effect on the performance of the order picking system. The original bound cavities method has been developed, which defines the sequence of execution of received orders in "pick and pass" systems, where the tendency is to perform zone changes in places where there is a continuity of no items for extraction. The paper shows the total picking time and time saving calculations, as well as benefits of its use, which are proven through simulation models of a zone order picking system with two and three pickers.

Transport of people in buildings and at relatively short distances is possible by escalators. Escalators have a great application in the transport of the people and they represent an important part of vertical transport. As escalators are used at all ages, it is necessary to design them to be safe. Due to the large number of moving parts and the complicated construction of the escalator, it is necessary to perform periodic checks and controls of their correctness and safety for the transport of people. The paper gives an overview of the basic elements of escalators, and some potential dangers and appropriate safety measures for their prevention.

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