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Estimating Schedule for Systems Engineering Projects:�Notes from the Workshop

Boehm CSSE

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11/15

Jim Alstad

Boehm Center for Systems and Software Engineering

Jim Alstad

310/344-0894

Alstad.home@computer.org

Boehm COCOMO Forum

Workshop on this topic

Aerospace@Chantilly & Online

November 15, 2023 at 14:25 Eastern

ESSE: Notes

Boehm CSSE

Center for Systems and Software Engineering

2 of 6

Agenda (Reminder)

Introduction

  • Workshop format
  • Valerdi & Wheaton Staffing Profile Chart

Presentations from others

Jim on moving toward a duration estimating model

  • The Consult phase
  • Phase duration estimation

A duration estimation exercise

Throughout, Jim will take notes

Bibliography

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Boehm CSSE

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11/15

ESSE: Notes

Boehm CSSE

Center for Systems and Software Engineering

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Notes

  • Marilee:
    • Chart was done through expert judgement, including a Delphi refinement
    • Chart is believed to be to scale
    • Check with Ricardo for any details he has
  • Mauricio:
    • Paper by Ricardo on estimating schedule
    • /https://dspace.mit.edu/bitstream/handle/1721.1/84092/cp_090420_gaffney%2cvalerdi%2cross_cser.pdf?sequence=1&isAllowed=y
    • Will be attached to Notes
    • Consult phase shown in chart is too low
    • SE may need to do additional work in preparation for manufacturing (Marilee agrees)

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ESSE: Notes

Boehm CSSE

Center for Systems and Software Engineering

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Notes 2

  • Marilee:
    • Have been issues with too low a level of SE during “Consult”
    • Digital transformation could imply even higher level during Consult
  • Sal Bruno
    • May need to consider non-waterfall variations (spiral, etc), which would affect the schedule planning in a major way.
  • Bob et al
    • Need for SEs drops off after their initial work
    • Few are needed during, e.g., system test
    • SEs don’t actually perform system tests, just oversee
  • Rita Creel

Bob

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ESSE: Notes

Boehm CSSE

Center for Systems and Software Engineering

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Notes 3

  • Marilee:
    • Remembering development of Staffing Profile Chart—some aspects were more notional
    • Possibly Staffing Profile Chart is not so representative of actual projects
    • We should review the new 15288!
  • Path forward
    • Review 15288 and reconsider Staffing Profile Chart
  • Marilee
    • Shouldn’t we need to consider overall project schedule
  • Brad
    • Try developing a COSYSMO duration estimating formula by analogy with COCOMO duration estimating formula

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Boehm CSSE

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ESSE: Notes

Boehm CSSE

Center for Systems and Software Engineering

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Notes 4

  • Winsor:
    • Try adding schedule information to a COSYSMO cost estimating data set (COSYSMO 1? COSYSMO 3?)
  • Marilee
    • See if original questionnaires for COSYSMO 1 are available, and if they have schedule data

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Boehm CSSE

6

11/15

ESSE: Notes

Boehm CSSE

Center for Systems and Software Engineering