Literature review for sample size analysis in time studies Conference Paper uri icon


  • An important method related to Lean strategies is Hoshin Kanri which combines operation and strategic management in order to solve both short and long-term problems in companies. Time studies are an effective way in order to apply this method. This paper regards to literature review in time studies of a process. In the literature review, two approaches of defining a sample size are presented: statistical analysis and conventional guide’s method, both currently used in some companies. Future analysis of the data collected in a company’s production line is devoted to verify whether or not the sample size is adequate, using both methods presented in this work.
  • In industrial context, it is important to act strategically and focus not only on daily challenges but also on the future ones. Hoshin Kanri is a methodology that builds a link between strategic and operational management. Problem identification and process understanding are key factors for this method, they can be facilitated through labor standards, which can be set through the time studies of a process. For a reliable study of time, it is necessary to define the task in study, divide it in measurement points, define how many times the task will be measured (sample size), measure the time and calculate the variance, average, maximum and minimum values. The determination of sample size is indispensable for an adequate study of time.
  • This work has been supported by FCT - Fundação para Ciência e Tecnologia within the Project Scope: UIDB/05757/2020
  • This work has been supported by FCT—Fundação para a Ciência e Tecnologia within the Project Scope: UIDB/05757/2020.

publication date

  • January 1, 2022