A good task design improve the efficiency of the business, because reduces cost and helps you to analysis the risk classification, and permit manager the influence of human and organizational factors of the complexity of socio-technical systems. A discussion is held on the techniques proposed by Embrey, Lees, Hollnagel, Reason, Rasmussen and Avila dealing with the task of project subject and its forms of control. Understanding the complexity of production systems enables the development of suitable tools to prevent accidents and to mitigate their consequences. The task performance depends on cognitive and organizational requirements beyond the technical: (a) organizational climate for transparency in the reporting of incidents; (b) managerial profile to communicate routine operating and emergency; (c) indicators for decision-making on the task; (d) sufficient knowledge base for the team accomplish the task; (e) communication tools for the production shift and return the view for the staff; (f) trust, cooperation, understanding of the risks and the causal relationship of events to perform the task; (g) understanding of the work patterns and the resulting on the performance indicators in the control of production; and (h) the appropriate design technology, process and equipment to allow review on the man-machine interface or man procedure. David Embrey discusses the Hierarchical Task Analysis HTA and presents criteria from the risk and complexity of the task. Lees presents discussion on the need of the side project of machine and man presenting cognitive requirements for machine design and machine operating requirements for human knowledge. Rasmussen and Reason discuss level of knowledge, understanding of the rules and skills needed to perform the task. Holnagel presents a way to plan the task with the analysis of goals, steps and commitments. Avila discusses the technology, the complexity of the task, the risk environments, barriers, tooling, pattern, knowledge and commitment and propose Procedures and Standards (PADOP), considering the analysis of the critical task by quantifying efforts, level of parallelism in its realization, the discussion on acceptance level based on target performance indicators and their measurement to suggest changes. An exercise is developed based on operational control practice in the chemical industry sulfuric acid purification. (C) 2015 The Authors. Published by Elsevier B.V.