Chris Johnson, Index
The Basics: Hardware Management

Some consequences of designing equipment without a PPL are:
  1. Proliferation of non-preferred parts and materials with identical functions
  2. Increased need for development and preparation of engineering justification for new parts and materials
  3. Increased need for monitoring suppliers and inspecting/screening parts and materials
  4. Selection of obsolete (or potentially obsolete) and sole-sourced parts and materials
  5. Possibility of diminishing sources
  6. Use of unproven or exotic technology ("beyond" state-of-the-art)
  7. Incompatibility with the manufacturing process
  8. Inventory volume expansion and cost increases
  9. Increasing supplier base and audit requirements
  10. Loss of "ship-to-stock" or "just-in-time" purchase opportunities
  11. Limited ability to benefit from volume buys
  12. Increased cost and schedule delays
  13. Nonavailability of reliability data
  14. Additional tooling and assembly methods may be required to account for the added variation in part characteristics
  15. Decreased part reliability due to the uncertainty and lack of experience with new parts
  16. Impeded automation efforts due to the added variability of part types
  17. Difficulty in monitoring vendor quality due to the added number of suppliers
  18. More difficult and expensive logistics support due to the increased number of part types that must be spared.