Customer Reviews

Orlicky's Material Requirements Planning

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I am the system administator at my company. Out of frustration at many problems we have been having with the MRP module of our integrated system, I looked for a good source of knowledge about how MRP *should* work. In Orlicky's MRP I found that source. Orlicky's MRP is probably one of the best written books on the subject that I've seen. I had no trouble at all understanding the complex concepts that were presented, despite my lack of MRP knowledge and experience. Indeed, during the time that I read the book, I discovered that there were several things we were doing wrong because we didn't have a good understanding about the way MRP should work. For example, for a long time we had been laboring under the fallacy that a released work order should increase allocations not only for the primary components of a parent but also for the components of those components! Orlicky's MRP set me straight, stating that mistaking the Planning phase of MRP for the Execution phase (or vice-versa) was a common problem. I will never have that problem again thanks to this book. Another thing I learned from this book was how the bill of material, MRP, and backflushing were interrelated. This book is an excellent manual for those who wish to learn more about MRP, and it's a good source to refer to when looking for answers about why your MRP system isn't performing well.

Without question this is the classic MRP text. Originally written in 1975, this 1994 updated version covers the basic logic and setup of MRP. Though most production and inventory management books cover MRP, they tend to cover it so quickly that if you didn't already understand MRP, you probably still won't after reading them. Orlicky's Material Requirements Planning moves more slowly and provides much more detail. It's also written in an easy to understand style that makes it great for beginners.

The book is not perfect, however. I would have liked to see more details on some topics such as planning bills and phantom bills. Also the structured approach that would lead you to believe you must have a formal Master Production Schedule (MPS) to run MRP is misleading (this is a common problem with virtually all MRP books). MRP can run fine being fed directly by the forecast in certain environments.

Probably the most important reason to read this book is the simple fact that it is likely the people that designed your MRP software used this book as a roadmap.

Everybody interested in MRP has seen Orlicky's book as a reference work. This book compliles it's work plus all the developments of this technique since its issue in the fifties. The beauty of this work is that it gathers all the pitfalls, successes and fails encountered by the "MRP crusades". It also contends about the realationship between MRP and JIT and it's possible combination.

I want to study "The detail logic of material requirements planning".