<Li>' Illumination Experiments (1924--27) to find out the effect of illumination on worker's productivity .' </Li> <Li>' Relay Assembly Test Room experiment (1927--28) to find out the effect of changes in number of work hour and related working condition on worker productivity .' </Li> <Li>' Experiment in interviewing Working: In 1928, a number of researchers went directly to workers, kept the variables of previous experiment aside, and talked about what was, in their opinion, important to them . Around 20,000 workers were interviewed over a period of two years . The interviews enabled the researchers to discover a rich and intriguing world that previously remained undiscovered and unexamined within the Hawthorne studies undertaken so far . The discovery of the informal organisation and its relationship to the formal organization was the landmark of experiments in interviewing workers . These experiment led to a richer understanding of the social, interpersonal dynamics of people at work .' </Li> <Li>' Bank wiring Room Experiments (1931--32) to find out social system of an organization .' </Li>

Which of the following is included in the open systems perspective of organizations