Activity Sampling

Activity sampling is the name given to the process of collecting information about machine or human activities by making a large number of instantaneous observations of the subject instead of by continuous timing, as in the case of time study.  This technique provides a rapid and effective means of studying the pattern of almost any type of activity and its usefulness increases as the number of subjects to be observed becomes greater. 

The degree of confidence and accuracy in the results can be varied at will to known levels by varying the number of observations in accordance with a statistical formula.

If the stage of activity or inactivity only is recorded, the process is called ‘Activity Sampling’ and this may be used to obtain estimates of: 

• The utilisation of plant or labour and the reasons for losses in utilisation

• The proportion of a given period that machines or persons are occupied by specific activities.

If, in addition to the state of activity, an estimate of the working pace of the operators is recorded, the technique becomes known as ‘Rated Activity Sampling’ and this may be used for: 

• Setting standard times for work in which several people are engaged as a team

• Checking the overall validity of existing time standards for a number of products   or activities.