Trường hợp là người lao động? Tại sao có 10 dặm của giao thông detoured và chỉ có 10 bãi của công việc đang hoạt động? Không chỉ vậy, nhưng bạn lái xe ngang qua chỗ đó sáu tháng trước và hầu như bất cứ điều gì đã thay đổi. Bắt vượt ra ngoài sự thất vọng trước mắt của bạn với sự chậm trễ giao thông, | 140 RESOURCE LEVELING GAMES OF CHANCE In life they say that two things are certain death and taxes. When it comes to computer-based resource leveling there are also a couple of things that you can bet on. First don t expect to obtain an optimum solution. Second you will rarely obtain the same solution even within the same program. And we might add there are no assurances that the higher-priced or more functionally endowed products will provide shorter or more consistent results. That is not to assume that the software designers are either lax or inept regarding the resource leveling function. On the contrary a lot of effort has gone into most of these products to support effective resource scheduling and excellent resource leveling capabilities have been available for more than 20 years. The problem is primarily one of tradeoffs and of real world considerations. It may very well be possible to generate an optimized solution. However you may not wish to pay the price for executing such routines. First it would tend to require extensive computer resources. Second it would require so many iterations to slow down the process to an unacceptable level. However even more important it would require the user to make critical and unnecessary decisions long before they are needed and then to relinquish control of this complex process to the computer. And because conditions change as the project is being scheduled and executed the decisions made at the beginning may no longer be appropriate down the line. User intervention may be required to produce the right resource schedule. The issue here is that there are usually sensitive criteria that must be considered when deciding which task should get the limited resources. In the first place it would be tedious to define all of these decision factors to the computer after all we are already protesting the amount of detail that must be entered to produce a decent project model . But more to the point it would be even more difficult
