Self-service adoption follows an S-curve: initial resistance, accelerated adoption, and eventual saturation. Early stages are slowed by trust issues, usability gaps, or regulatory friction. Acceleration occurs as processes simplify, interfaces improve, and incentives align. Saturation is reached when all suitable segments migrate or hybrid adoption stabilises. Continuous optimisation and feedback loops are essential to maintain growth. Studies emphasise UX design and progressive disclosure as critical success factors (Forrester, 2021; McKinsey, 2022).