Người ta có thể đã tồn tại và do đó sẽ là điểm khởi đầu cho JPP. Nếu một trong những hiện không tồn tại, nó phải được phát triển như là một phần ban đầu hoặc điều kiện tiên quyết để bắt đầu JPP. Tình hình sẽ chỉ ra cách tốt nhất để tiến hành. | Critical Chain Project Management 261 Penetration into the Middle Third of the Buffer Penetration into the middle third of the buffer does call for some action on the part of the CCPM project manager. In this case the correct action is to investigate the cause of the slippage and put a get-well plan in place. The earlier in the sequence this occurs the more serious the problem. Penetration into the Final Third of the Buffer Penetration into the final third of the buffer is serious regardless of when in the sequence it occurs. Obviously if it is in the first third of the duration of the sequence it is very serious. If it occurs late in the final third there may be little that can be done. In any case action is called for. Figure is a matrix that can be used to determine schedule slippage severity and need for action as a function of buffer penetration and distance into the task sequence. Buffer Penetration First Third Second Third Final Third First Third Task Sequence Second Third Penetration Final Third NO ACTION Serious problem immediate action required A very serious problem exists aggressive action is needed NO ACTION Define the problem and formulate a solution Serious problem implement the solution Task sequence will be ahead of schedule NO ACTION Monitor the situation for any further penetration Figure Buffer penetration and action decisions. 262 Chapter 12 To grasp the significance of the penetration matrix let s first consider the diagonal from the top left cell to the bottom right cell in Figure . The cells on the diagonal reflect situations where task sequence penetration is about equal to buffer penetration. The statistician would say that is what we should expect on the average. However the further we move into task sequence penetration moving down the diagonal the more we should be paying attention to the team s performance on the work being done on the tasks in the sequence. The nearer we are to the ending tasks in the sequence the less .
