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Even clearly defined rules require a complex translation process to be operationalized by technology, as shown by MLB's seven-year effort to automate ball and strike calls.

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2026-06-30 18:59 UTC pith:GOIG6ITK

load-bearing objection The MLB ABS case shows that even rulebook-clear enforcement still needs years of sociotechnical translation work because ground truth mixes written rules with prior practice and stakeholder balancing.

arxiv 2605.16237 v3 pith:GOIG6ITK submitted 2026-05-15 cs.CY cs.HC

Inside Baseball: The Automated Ball-Strike System as an Object Lesson in Technological Rule Enforcement

Andrea Wen-Yi Wang , Waki Kamino , David Mimno , Karen Levy , Malte F. Jung This is my paper
classification cs.CY cs.HC
keywords automated decision systemstechnological rule enforcementstrike zonesociotechnical systemsbaseball umpiringimplementation challengesground truth in rules
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper examines Major League Baseball's Automated Ball-Strike System to challenge the idea that straightforward rules are easy to automate. It traces how the strike zone, though defined in the rulebook, demanded years of design adjustments because its practical meaning had always blended written rules with umpires' real-world calls. The study shows that implementing such a system involves balancing multiple stakeholder values within an existing ecosystem. This leads to a call for evaluating automated enforcement not just by distance from the formal rule but by how the system is experienced in practice. The case illustrates broader issues in turning rules into technological systems.

Core claim

Although the strike zone is an area clearly defined in the rulebook, it took MLB seven years to figure out how to automate calling balls and strikes with ABS, showing how even seemingly straightforward rules require a complex translation process to operationalize via technological systems. The distance between rule and implementation exists because the ground truth of the strike zone has historically been a hybrid of the rulebook definition and umpires' enforcement decisions, and because ABS must fit into an ecosystem that balances multiple stakeholder values.

What carries the argument

The seven-year design process of the Automated Ball-Strike System (ABS), which operationalizes distance to the strike zone by negotiating historical umpire practices and stakeholder interests rather than applying the rulebook definition alone.

Load-bearing premise

The ground truth of the strike zone can be treated as solely the rulebook definition instead of a long-standing hybrid with umpires' enforcement decisions.

What would settle it

A direct test comparing ABS call accuracy and acceptance when it strictly follows the rulebook definition versus when it incorporates historical umpire strike zone data would show whether the hybrid approach is required for practical use.

Watch this falsifier — get emailed when new claim-graph text bears on it.

If this is right

  • Evaluation of automated rule systems must account for how they are experienced in practice rather than centering only on fidelity to the written rule.
  • Technological enforcement systems need to balance multiple stakeholder values within existing ecosystems instead of assuming a neutral mapping from rule to output.
  • In-depth social science approaches are needed to assess implementation beyond conventional accuracy metrics.
  • Similar translation distances are likely to appear in other domains where rules meet automated enforcement.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same hybrid-ground-truth issue could arise in automated traffic enforcement or regulatory compliance tools where historical human discretion has shaped effective rules.
  • Designers of future systems might need to include historical practice data as a core input rather than starting from formal rules alone.
  • This perspective could shift focus in system evaluation from pure technical accuracy to acceptance by affected parties over time.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

0 major / 2 minor

Summary. The paper presents an in-depth case study of Major League Baseball's seven-year experimentation with the Automated Ball-Strike System (ABS). It claims that even though the strike zone is clearly defined in the rulebook, automating ball-strike calls required extensive design work because the ground truth has always been a hybrid of the rulebook definition and umpires' enforcement practices, and because implementation must balance multiple stakeholder values within the existing ecosystem. Drawing on Science and Technology Studies (STS) frameworks, the authors argue that this reveals a 'distance' between clear rules and technological operationalization, challenging conventional evaluation paradigms that center only on rule-to-implementation distance and instead calling for social science approaches to assess how such systems are experienced in practice.

Significance. If the historical and contextual analysis holds, the paper supplies a concrete, non-circular object lesson for FAccT on the sociotechnical complexities of automated rule enforcement. It credits the use of an external seven-year case study (with traced design decisions) to illustrate why in-depth interpretive methods are needed beyond technical metrics, contributing to conversations on fairness and accountability in sociotechnical systems.

minor comments (2)
  1. [Abstract] Abstract: The claim that 'it took MLB seven years to figure out how to automate' would benefit from a brief parenthetical example of one key design decision (e.g., sensor placement or zone calibration) to preview the empirical substance for readers.
  2. The manuscript would be strengthened by explicitly naming the specific STS analytic frameworks invoked (e.g., which concepts from actor-network theory or boundary objects) when they are first applied to the ABS case.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for their supportive review, accurate summary of the manuscript's contributions, and recommendation for minor revision. The assessment of significance aligns well with our intent to provide a concrete STS case study for FAccT audiences.

Circularity Check

0 steps flagged

No significant circularity identified

full rationale

The paper is a qualitative STS case study of MLB's ABS development, tracing historical and ecosystem factors in rule operationalization. Its central claims rest on external historical records, rulebook text, and stakeholder analysis rather than any derivation chain, equations, fitted parameters, or self-citations that reduce assertions to inputs by construction. No load-bearing steps match the enumerated circularity patterns; the argument is self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The paper relies on established STS frameworks and the premise that strike-zone ground truth is historically hybrid; no free parameters, new entities, or ad-hoc axioms are introduced beyond domain assumptions from the field.

axioms (1)
  • domain assumption The ground truth of the strike zone is contested because the rule in practice has always reflected a hybrid between the rulebook definition and umpires' enforcement decisions
    Directly invoked in the abstract to account for the observed distance between rule and technological implementation.

pith-pipeline@v0.9.1-grok · 5830 in / 1214 out tokens · 34601 ms · 2026-06-30T18:59:29.640412+00:00 · methodology

0 comments
read the original abstract

Clearly-defined rules are often assumed to be straightforward to automate and evaluate. We challenge this assumption through an in-depth study of Major League Baseball's (MLB) seven-year experimentation with the Automated Ball-Strike System (ABS). ABS is envisioned to call balls and strikes accurately: a seemingly straightforward use of technology to objectively determine the distance between a pitch and the strike zone. Although the strike zone is an area clearly defined in the rulebook, it took MLB seven years to figure out how to automate calling balls and strikes with ABS, showing how even seemingly straightforward rules require a complex translation process to operationalize via technological systems. In this paper, we trace the design decisions that led to the current implementation of ABS. Our case study reveals that "distance" exists even between a clear rule and its technological implementation. Using analytic frameworks from Science and Technology Studies (STS), we show that such distance exists because (1) historically, the "ground truth" of the strike zone is contested: the rule in practice has always reflected a hybrid between the rulebook definition and umpires' enforcement decisions; and (2) the use of ABS is embedded in an existing eco-system, where the implementation of a technological enforcement system needs to balance multiple stakeholder values. This perspective challenges conventional evaluation paradigms that center on the distance between a formalized rule and its technological implementation, and instead calls for evaluating how such systems are experienced in practice. Addressing this question requires in-depth social science approaches, contributing to ongoing conversations in FAccT about the implementation and evaluation of sociotechnical systems.

Figures

Figures reproduced from arXiv: 2605.16237 by Andrea Wen-Yi Wang, David Mimno, Karen Levy, Malte F. Jung, Waki Kamino.

Figure 1
Figure 1. Figure 1: The official strike zone per the MLB rulebook, a three [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Making the strike zone visible. (a) The Brooklyn Dodgers experimented with electronic strike zones in the 1950s. Sports Studio Photos/Getty Images Sport via Getty Images [62]. (b) ESPN began to overlay a computer graphic called the ‘K-Zone’ since 2001 in their televised broadcast. YouTube video, posted by Detlef, 0:59 [26]. Despite the rules designating um￾pires as the final arbiters of strike zones, there… view at source ↗
Figure 3
Figure 3. Figure 3: Moving the ABS strike zone from the front of home plate (red) to [PITH_FULL_IMAGE:figures/full_fig_p011_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: MLB designed a roughly 10-second video to play when players invoke ABS to challenge an umpire’s call. This video [PITH_FULL_IMAGE:figures/full_fig_p013_4.png] view at source ↗

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