TY - JOUR AU - Apostolos Mouzakitis PY - 2025 DA - 2025/12/07 TI - Entropy and Fisher Information in Process Viability: The IEPI Framework JO - Japan Journal of Research VL - 7 IS - 1 AB - Entropy quantifies informational dispersion in stochastic systems, whereas Fisher information measures local sensitivity to parametric perturbations. This paper introduces the Information Entropy Performance Indicator (IEPI), a discrete information-theoretic framework that jointly characterises uncertainty and responsiveness to assess the viability of stochastic processes. A functional entropy range [H_min^*,H_max^* ] defines a bounded regime between deterministic rigidity and stochastic instability. Analytical results establish a formal coupling between Shannon entropy and Fisher information, yielding a responsiveness-induced entropy floor and enabling precise viability criteria. IEPI thus provides a mathematically rigorous basis for steering adaptive processes within defined informational limits. SN - 2690-8077 UR - https://dx.doi.org/10.33425/2690-8077.1220 DO - 10.33425/2690-8077.1220