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WSA QASIG TOC in 5 minutes. November 8, 2006 Jay Bakst Technologies Services Group. Contingency vs. Buffer. Parkinsons Law : Work expands to fill the time allowed Goldratt’s Principle : A project will accumulate delays, it will not accumulate gains

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wsa qasig toc in 5 minutes

WSA QASIGTOC in 5 minutes

November 8, 2006

Jay Bakst

Technologies Services Group

contingency vs buffer

Contingency vs. Buffer

Parkinsons Law:Work expands to fill the time allowed

Goldratt’s Principle:A project will accumulate delays, it will not accumulate gains

Moral: implicit task buffers lead to unexpected delays

use of buffer
Use of Buffer

“Expecting early finishes to balance out late finishes is only a figment of the scheduler’s imagination”

Carol Ptak, Theory H.O.W.

  • If task schedule more than median time:
    • More than half finished early
    • Each early task wastes project buffer
  • If median used:
    • Half tasks will be late
  • If optimal time used:
    • Most tasks will be late
    • Move use of buffer later in project
results
Results:
  • Explicit identification and use of Buffers lead to reduced buffer time and reduced project time

Moral: Proper use of buffers gives you more time to do useful testing