Project Controls and Learning SCaN Project

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Objectives. • Study the replenishment cycles of the Tracking and. Data Relay Satellite System (TDRSS) network from a systems engineering perspective.
Space Communication and Navigation (SCaN) Project Dynamics Daniel Adsit, Aleksandra Markina, Marc Sanchez Net and Ana Diaz Artiles, MIT

SCaN Project:

Project Controls and Learning

• Provides communication services to all NASA missions • Uses ~2-3% of NASA’s budget • The TDRSS network is operated within SCaN

Objectives •



Study the replenishment cycles of the Tracking and Data Relay Satellite System (TDRSS) network from a systems engineering perspective Understand the effects of learning, work intensity and schedule slippage controls on the project

System Dynamics Model

Learning effect: After the first satellite is built fraction correct and complete (FCC) and productivity are improved for subsequent satellites.

Results Design Willingness to Use Intensity & Extra Hours, 0-1

Cumulative Effort, 37704-38977 Staff*Weeks

Method

Design Willingness to Slip Schedule, 0-1

Build/Test Willingness to Use Intensity & Extra Hours, 0-1

Project Duration, 825-854 Weeks



The project has been modeled based on a 2-phase model with: - Effect of Learning when building multiple satellites - Willingness to work extra hours or increase intensity to mitigate schedule pressure - Willingness to slip schedule so as to mitigate schedule pressure • The model has been calibrated based on known information from TDRSS 3rd generation

Calibration Design: Concept Studies 1

Acquisition 2 Strategy

Planned Duration

Actual Duration

Design

264 weeks

312 weeks

Build/Test

432 weeks

500 weeks

Task

No Controls

• • •

• Sat 3 5 LT Build

1

Project Kick-off: Early 2012

2

Contract awarded: Dec 2007

3

Launch TDRS-K: Jan 2013

4

Launch TDRS-L: Jan 2014 (planned)

5

Launch TDRS-M: Dec 2015 (planned)

Best Controls

Worst Controls

Project schedule and cost are moderately influenced by variations on FCC and productivity Significant saving can arise from improving the learning curve The best project is achieved by allowing schedule slippage in the Design Phase and increasing the work pressure in the Build/Test Phase

Top Three Questions •

Sat 1 3 LT Build Sat 2 4 LT Build

Standard Controls

Conclusions

Build/Test: Acquisition and Acceptance Satellite Design

Definition and Studies

Build/Test Willingness to Slip Schedule, 0-1



How can effects of learning be estimated for a given project from past data from similar projects? Can project dynamics models capture disparate project management practices of government and commercial partners? What modeling techniques are most appropriate for addressing stakeholder interactions during requirements negotiations?

Stevens Institute of Technology- School of Systems and Enterprises