Beyond Failure Recovery: An Engagement-Aware Human-in-the-loop Framework for Robotic Systems
Pith reviewed 2026-06-27 00:21 UTC · model grok-4.3
The pith
Engagement-aware MPC plans interactions proactively to hold user engagement at a target level while respecting workload limits.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
E-MPC is a model-predictive controller that incorporates an explicit user-interaction dynamics model; the model predicts how engagement evolves as a function of interaction frequency and type, and the planner selects interaction actions at each step to drive predicted engagement toward a desired setpoint while enforcing a workload constraint and preserving task completion.
What carries the argument
Engagement-aware Model Predictive Control (E-MPC) that embeds a dynamics model of engagement evolution driven by interaction frequency and type.
If this is right
- Robots can schedule user input at regular intervals rather than only on failure, keeping users involved in decision-making for the entire task duration.
- Task performance metrics remain comparable to failure-triggered baselines while subjective engagement and workload scores improve.
- The same planning structure can be tuned to different target engagement setpoints for users who prefer more or less involvement.
- In physical caregiving, users with mobility constraints avoid long passive intervals without incurring extra fatigue from constant requests.
Where Pith is reading between the lines
- The method could be tested in domains outside caregiving, such as shared-control manufacturing or navigation assistance, where sustained attention matters.
- Learning the engagement dynamics parameters online from individual users would allow the planner to adapt without a pre-specified model.
- Adding explicit uncertainty bounds on the engagement predictions would let the controller trade off engagement risk against task risk in a more principled way.
Load-bearing premise
The dynamics model that maps interaction frequency and type to future engagement levels is accurate enough for the optimizer to reliably reach the target engagement without violating workload limits.
What would settle it
A follow-up study that measures actual engagement trajectories under E-MPC plans and finds statistically significant, systematic deviations from the model's predictions that cause either sustained disengagement or workload violations.
Figures
read the original abstract
Conventional human-in-the-loop approaches typically involve users only when a robot encounters failure or uncertainty, treating humans primarily as tools for improving robot performance. However, in many human-centered robotics settings, interaction should support engagement by keeping users involved in decision-making rather than limiting them to failure-driven interventions. This is particularly compelling in physical caregiving, where mobility limitations can reduce users' ability to intervene or modulate the robot's behavior in the moment. As a result, failure-driven interaction policies may relegate users to passive observers for long stretches of the task. For example, a user with mobility limitations may feel less engaged when being continuously and passively fed by a robot. At the same time, overly frequent interaction can be tiring and increase the user's workload. To address this trade-off, we propose Engagement-aware MPC (E-MPC), a user-engagement-aware method that plans interaction to maintain engagement while respecting a workload constraint. E-MPC leverages a user interaction dynamics model that captures how user engagement evolves as a function of both the frequency and type of interaction. Rather than requesting input only when difficulties arise during task execution, the robot proactively considers the user's preferred level of engagement throughout the task, balancing autonomy and interaction while ensuring task success. We evaluate E-MPC in simulation with several ablations and baseline comparisons. Results demonstrate the effectiveness of our approach across diverse user personas. In addition, we conduct a real-world user study with participants with emulated mobility limitations on a robot-assisted bite acquisition system, showing that E-MPC improves user experience while maintaining task success.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The paper proposes Engagement-aware MPC (E-MPC), an extension of standard MPC for human-in-the-loop robotic systems (e.g., caregiving for mobility-limited users). E-MPC uses a user interaction dynamics model that maps interaction frequency and type to evolving engagement levels; the planner proactively selects interactions to maintain a target engagement while respecting workload constraints and preserving task success. Evaluation consists of simulation ablations and baseline comparisons across user personas plus a real-world user study on a robot-assisted bite acquisition task with emulated mobility limitations, claiming improved user experience without loss of task performance.
Significance. If the engagement dynamics model is shown to be accurate and generalizable, the work offers a principled shift from reactive failure-recovery to proactive engagement maintenance in HRI. This could matter for assistive robotics where prolonged passivity harms user well-being; the combination of MPC with an explicit engagement state and the dual simulation-plus-real-user evaluation would be a concrete contribution if the model holds.
major comments (2)
- [Abstract / User Interaction Dynamics Model section] The central claim that proactive engagement planning improves UX rests on the accuracy of the user interaction dynamics model (Abstract). The manuscript must demonstrate that this model was derived or validated independently of the final user-study outcomes; otherwise the reported UX gains cannot be attributed to the engagement-aware component rather than other MPC elements or study design.
- [Evaluation section] Simulation ablations and the real-world study are presented as evidence across personas, yet the abstract supplies no quantitative metrics (e.g., engagement scores, workload ratings, statistical tests, sample size). Without these, it is impossible to judge whether the workload constraint is actually satisfied or whether task success is maintained at a level comparable to baselines.
minor comments (2)
- [Methods] Clarify whether the engagement dynamics model contains any free parameters fitted to the same user-study data used for final evaluation.
- [Abstract] The abstract states that E-MPC 'maintains task success'; explicit comparison tables or figures showing success rates versus baselines would strengthen this.
Simulated Author's Rebuttal
We thank the referee for the constructive feedback on the validation of the engagement model and the need for quantitative metrics in the abstract. We address each major comment below and will incorporate revisions where appropriate to strengthen the manuscript.
read point-by-point responses
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Referee: [Abstract / User Interaction Dynamics Model section] The central claim that proactive engagement planning improves UX rests on the accuracy of the user interaction dynamics model (Abstract). The manuscript must demonstrate that this model was derived or validated independently of the final user-study outcomes; otherwise the reported UX gains cannot be attributed to the engagement-aware component rather than other MPC elements or study design.
Authors: The user interaction dynamics model is grounded in prior HRI literature on engagement and workload, with its structure and parameters initially specified and ablated in simulation studies performed independently of the real-world user study. The simulation results across personas serve as the primary validation of the model's predictive accuracy for engagement evolution. The user study evaluates the end-to-end E-MPC framework rather than fitting the model itself. To address the concern directly, we will add an explicit subsection detailing the literature basis, simulation-based derivation, and pre-study validation steps so that readers can clearly separate model development from the final evaluation. revision: yes
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Referee: [Evaluation section] Simulation ablations and the real-world study are presented as evidence across personas, yet the abstract supplies no quantitative metrics (e.g., engagement scores, workload ratings, statistical tests, sample size). Without these, it is impossible to judge whether the workload constraint is actually satisfied or whether task success is maintained at a level comparable to baselines.
Authors: We agree that the abstract would benefit from quantitative results to allow readers to assess the claims at a glance. We will revise the abstract to include key metrics from both the simulation (e.g., engagement maintenance rates, workload constraint satisfaction percentages) and the user study (e.g., mean engagement scores, NASA-TLX workload ratings, task success rates, statistical comparisons to baselines, and participant sample size). revision: yes
Circularity Check
No significant circularity; derivation relies on independent dynamics model and external evaluations
full rationale
The paper's central claim rests on proposing E-MPC that uses a user interaction dynamics model to evolve engagement based on interaction frequency and type, then optimizes under workload constraints. This model is introduced as a modeling choice rather than derived from the target result, and effectiveness is shown via simulation ablations plus a real-user study with emulated mobility limitations. No equations or claims reduce the predictions to fitted inputs by construction, no self-citation chains justify uniqueness, and no ansatz or renaming is smuggled in. The load-bearing element is the model's accuracy (an empirical assumption), not a definitional loop.
Axiom & Free-Parameter Ledger
Reference graph
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[43]
[Show a demo of the hard drawing-based question] How engaged would you feel if you keep interacting with the robot by answering this type of drawing-based questions?
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[44]
[Show a demo of the easy MCQ] How engaged would you feel if you keep interacting with the robot by answering this type of food shape questions?
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[45]
How engaged do you want to be in this task? (Note: Your answer would change how often you are asked by the robot and the type of questions)
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[46]
draw pick up points
What is the largest workload you can accept in this task? (Note: 10% roughly corresponds to asking you one "draw pick up points" question in 5 minutes, 100% roughly corresponds to asking you "draw pick up points " questions 10 times in 5 minutes.) G. Post-Method Questions Asked in User Study
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For the last method, how successful was it for keeping you engaged at your desired engagement level?
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For the last method, is the workload you felt during the task acceptable?
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For the last method, how satisfied are you with how successfully the robot completed the task?
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For the last method, how satisfied are you with how the robot interacted with you?
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Statistics of User Study Table A1 shows detailed statistics of the user study results
For the last method, how satisfied are you with how in control/agency you felt during the task? H. Statistics of User Study Table A1 shows detailed statistics of the user study results. I. Eye-gaze Analysis The additional eye-gaze analysis is conducted using study videos by estimating head pose (using head direction as a proxy for gaze) and projecting it ...
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