The book provides a comprehensive, systems-oriented approach to PPC. Key topics include:
Each chapter includes solved problems, case studies, and exercises, making it highly practical.
Sipper provides step-by-step MRP explosion examples, including low-level coding, gross-to-net calculations, and lot-sizing rules (L4L, EOQ, POQ). Any PDF with offset tables or misaligned time-phased records renders these chapters unusable.
From ABC classification to economic order quantity (EOQ) and safety stock calculations, Sipper’s tables and graphs are legendary. The "fixed PDF" is critical here because original scans often distort the complex nomographs and probability tables.
Sipper offers a pragmatic solution to "MRP nervousness" (when small changes in demand cause massive rescheduling). He recommends:
The fixed PDF includes clear time-phased charts demonstrating these concepts without page-spanning table breaks.
Many practitioners use a simplistic Z * σ_d formula. Sipper’s fixed edition provides a corrected formula that includes lead time variability:
[ SS = Z \sqrt(LT \cdot \sigma_d^2) + (d^2 \cdot \sigma_LT^2) ]
Where:
A broken PDF would print this as gibberish. The fixed version preserves the integral of the normal loss function tables, allowing precise calculation.
Sipper introduces a 2x2 matrix based on product volume and variety. Fixed PDF users can actually read the axes in the chart:
Action: Map your product portfolio onto this matrix. If you find a mismatch (e.g., using job shop scheduling for high-volume products), you have identified a major inefficiency.