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Recently, methods for monitoring and analyzing office workers' business activities are in demand to improve their efficiency. This paper discusses about methods to analyze office workers' procedures. Some methods have been proposed for monitoring business activities as following: time-study methods, PC-operation-log methods and sensor-log methods. However the above methods incur high cost or have critical restrictions. We developed a system for analyzing work tasks and status to monitoring workers' activities which overcomes the drawbacks. This system includes the PC-operation-log method and a videolog method. The video-log method uses multi-view video logs and captures moving objects in particular extracted domains connected to workers actions. It categorizes the worker's tasks and status and records them along with time stamps. The PC-operation-log method analyzes all a worker's mouse and keyboard operations. The system combines the results from the video-log method and those from the PC-operation-log method according to the work procedure. A set of experiments on the video-and-PC-operation-log method were performed on the work of a bank teller. The experiments showed that the accuracy of the combined video-and-PC-log method was 93.8% (in the best case), while that of the video-log method using only a single side-view camera was 47.0%. This huge improvement in accuracy result suggests that the video-and-PC-log combination is effective and applicable to the analysis of office workers' business activities.