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Background: Following the conclusion of a stepped-wedge cluster randomized trial of the Systems Analysis and Improvement Approach (SAIA) to optimize the prevention of mother-to-child HIV transmission cascade in Manica Province, Mozambique, we conducted a natural experiment to test the sustainability of the delivery model with limited financial inputs., Methods: District nurse supervisors were encouraged to continue to facilitate SAIA cycles in subordinate health facilities and provided phone credit and tablet access to upload implementation data. No additional resources (eg, funds for transport, refreshments, or supplies) were provided. Barriers to implementation were collected via conversations with district supervisors., Results: Monthly facilitation of SAIA cycles continued in 11 of 12 (92%) districts and 13 of 36 (36%) facilities through 12 months posttrial, which declined to 10 districts and 10 facilities by the end of the 15-month posttrial period. Despite interest among district supervisors to continue implementation, logistical and financial barriers prevented visits to facilities not in close proximity to district management offices. Turnover of district supervisors resulted in replacements not having knowledge and experience facilitating SAIA. The lack of refreshments for facility staff and limited supplies (pens and papers) were cited as additional barriers., Conclusion: Despite the scalability of the SAIA model, it is susceptible to implementation decay without sufficient health system resources. Additional research is needed to test sustainment strategies that address identified barriers and enable continued delivery of the implementation strategy core components at a sufficient level of fidelity to maintain desired health system improvements and patient-level outcomes., Competing Interests: The authors have no conflicts of interest to disclose., (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)