Abstract
Behaviours of computer software developers on analysis phase, detail design phase, test phase and documentation phase were analyzed in order to investigate the work conditions which are suitable for software development tasks. The observed element tasks were put in order from the view point of information creation of human. Appear ance rate of element tasks in a day, duration period of time of each element task were analyzed. Relation between element tasks was also analyzed with cross and HAYASHI 4 theories. These results show such tendency that there is a relation of transition among thinking, VDT task, writing and arrangement on desk as refreshment behaviour. Based on the results, environmental conditions for software development tasks were discussed.
