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  • 2017
  • Working Paper
  • HBS Working Paper Series

Digital Agility: The Impact of Software Portfolio Architecture on IT System Evolution

By: Alan MacCormack, Robert Lagerström, Martin Mocker and Carliss Y. Baldwin
  • Format:Print
  • | Language:English
  • | Pages:48
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Abstract

The modern industrial firm increasingly relies on software to support its competitive position. However, the uncertain and dynamic nature of today’s global marketplace dictates that this software be continually evolved and adapted to meet new business challenges. This ability—to rapidly update, improve, remove, replace, and reimagine the software applications that underpin a firm’s competitive position—is at the heart of what has been called IT agility. Unfortunately, we have little understanding of the antecedents of IT agility, specifically with respect to the choices that a firm makes when designing its portfolio of software applications. In this paper, we explore the relationship between software portfolio architecture and IT agility. In particular, we use modular systems theory to examine how different types of coupling impact the ability to maintain, retire, and commission new software applications. We test our hypotheses with a unique longitudinal dataset from a large financial services firm. Our sample comprises information on over 2,000 software applications observed over a four-year period. We find that applications with higher levels of coupling cost more to maintain, are less likely to be retired, and are less likely to be commissioned. However, we show specific types of coupling present greater challenges than others in terms of their impact. In particular, applications that are cyclically coupled (i.e., mutually interdependent) are the most difficult to manage in terms of maintaining and updating the software portfolio. Our results suggest that IT managers have a critical design role to play in firms that seek enhanced digital agility.

Keywords

Information Systems; Software; Architecture; Modularity; Agility; Coupling; Applications and Software; Design; Decisions; Performance

Citation

MacCormack, Alan, Robert Lagerström, Martin Mocker, and Carliss Y. Baldwin. "Digital Agility: The Impact of Software Portfolio Architecture on IT System Evolution." Harvard Business School Working Paper, No. 17-105, May 2017. (Revised October 2017.)
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About The Authors

Alan D. MacCormack

Technology and Operations Management
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Carliss Y. Baldwin

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More from the Authors
  • Your Company Needs a Space Strategy. Now. By: Matthew Weinzierl, Prithwiraj (Raj) Choudhury, Tarun Khanna, Alan MacCormack and Brendan Rosseau
  • FIELD Immersion 2022: Salt Lake City, Utah By: Alan MacCormack and Kerry Herman
  • Computer-Implemented Methods and Systems for Measuring, Estimating, and Managing Economic Outcomes and Technical Debt in Software Systems and Projects: US Patent 11,126,427 B2 By: Daniel J. Sturtevant, Carliss Baldwin, Alan MacCormack, Sunny Ahn and Sean Gilliland
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