Professional reliability in operational units depends not only on legal and procedural competence but also on psychological readiness for action under uncertainty, time pressure, and high responsibility. The article aims to conceptualize psychological readiness as a dynamic system supporting reliable professional action. Methods. A problem-oriented analysis of contemporary research in legal, cognitive, and organizational psychology, conceptual comparison, and structural-functional modelling were used. Results. A five-component model is proposed comprising motivational-value, cognitive-perceptual, emotional-volitional, communicative, and reflective-regulatory components. Professional reliability is shown to depend on the coordinated functioning of perception, alternative-hypothesis testing, emotion regulation, rapport building, and metacognitive monitoring. The analysis supports separating observable facts from interpretation, avoiding overreliance on nonverbal behavioural cues, and using an information-gathering style of professional communication. Practical significance. The model can guide psychological training, scenario-based exercises, professional selection, and structured debriefing of complex incidents. The article concludes that sustainable psychological skills require repeated practice under progressively increasing demands, supervision, and organizational support.