Reverse-Modelling
Posted: Fri Apr 17, 1998 8:29 pm
Gerhard Werner enquired about reverse modeling. Apparently his query =
relates to a complex manufacturing system. I would like to offer two =
possible solutions:
a) The first proposed solution might be rather simplistic, but then, the =
most effective solutions are often quite simplistic:
Most manufacturing systems are devised along an "ideal way" (compare =
maximum capacity according to the manufacturer versus real-life =
experience). One way of identifying variances would be to run two =
models, one reflecting the "ideal" system, and the other reflecting the =
real system. A simple program on a spreadsheet would then identify then =
variances above a predetermined tolerance level, thus pointing to the =
problem areas.
b) The second proposal is to model the system in terms of Professor =
Goldratts Theory of Constraints. Resource utilization can be modeled as =
stocks, or, alternatively, (more in line with Professor Goldratts =
theory), inventory should be modeled as stocks. Using Theory of =
Constraint principles, the bottlenecks can then be identified.
Regards,
Schalk Jacobs
From: "Schalk Jacobs" <busexcel@lantic.co.za>
relates to a complex manufacturing system. I would like to offer two =
possible solutions:
a) The first proposed solution might be rather simplistic, but then, the =
most effective solutions are often quite simplistic:
Most manufacturing systems are devised along an "ideal way" (compare =
maximum capacity according to the manufacturer versus real-life =
experience). One way of identifying variances would be to run two =
models, one reflecting the "ideal" system, and the other reflecting the =
real system. A simple program on a spreadsheet would then identify then =
variances above a predetermined tolerance level, thus pointing to the =
problem areas.
b) The second proposal is to model the system in terms of Professor =
Goldratts Theory of Constraints. Resource utilization can be modeled as =
stocks, or, alternatively, (more in line with Professor Goldratts =
theory), inventory should be modeled as stocks. Using Theory of =
Constraint principles, the bottlenecks can then be identified.
Regards,
Schalk Jacobs
From: "Schalk Jacobs" <busexcel@lantic.co.za>