TAILIEUCHUNG - The Handbook of Project Management_5

Tham khảo tài liệu 'the handbook of project management_5', khoa học xã hội, kinh tế chính trị phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Planning your project l 137 When third parties are required to carry out part of the work of a project it is essential to come to an understanding with them about the basis of their estimates. Remember that their estimate is probably a bid and includes contingencies and profit. Contingencies are discussed later but always avoid including contingencies in your estimates. Clearly identify extra time that is added for holidays etc. However if you are not careful people will add extra time and cost as a form of protection and argue that this can help bring in the project early and under budget. Ruthlessly strip such contingencies out of estimates. Padding estimates in this way can make an apparently good investment look like a bad investment or if the work is approved withhold funding and approval from other potentially valuable projects. These problems should never occur if you have an active PST and adopt the principles and processes we have discussed in earlier chapters. THE GOLDEN RULES To minimize the probability of falling into the pitfalls pay particular attention to the golden rules of estimating The individual doing the estimating must have a good understanding of the work he or she is estimating. Anyone expected to be involved in actually doing the work must be involved in estimating the task durations. These are the only people who know their limitations although they may not always admit to them and they will clearly identify when there is a steep learning curve before output is matched to the schedule requirements. Everyone involved in estimating must clearly understand the purpose and objectives of what they are doing and how to estimate effort and the size of the tasks. Only then will they produce estimates that will ultimately come true and avoid the mistake of predicting their best possible performance. EFFORT AND DURATION Fundamentally an estimate is a decision about how much time and resource is required to carry out a piece of work to acceptable .

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