The business environment in many emerging economies is characterised by complex institutional and operational constraints that impede enterprise growth and investment. A comprehensive, diagnostic understanding of these multifaceted challenges is required to inform effective policy and managerial strategy. This study aims to diagnose the predominant institutional and operational challenges facing businesses, to analyse their interrelationships, and to assess their perceived impact on firm performance and strategic decision-making. A sequential explanatory mixed-methods design was employed. First, a large-scale survey of business managers and owners quantified the prevalence and severity of challenges. Subsequently, in-depth semi-structured interviews with a purposively selected sub-sample explored the nuanced mechanisms and lived experiences behind the quantitative data. Quantitative analysis revealed that 68% of firms identified access to finance and bureaucratic regulatory compliance as the two most severe institutional constraints. Qualitative themes highlighted a pervasive 'enforcement gap', where formal rules are inconsistently applied, leading to strategic reliance on informal networks. A significant positive correlation was found between the perceived severity of infrastructure deficits and reduced investment in expansion. The business landscape is shaped by a synergistic nexus of formal institutional weaknesses and acute operational bottlenecks, which collectively foster an adaptive but inefficient reliance on informal coping mechanisms. Policy interventions should prioritise streamlining regulatory enforcement and deepening financial inclusion through credit guarantee schemes. Firm managers are advised to develop formalised risk mitigation strategies for infrastructure reliability. Business environment, institutional voids, operational challenges, mixed methods, Tanzania, emerging markets, behavioural strategy This paper provides a novel, integrated diagnostic framework that quantifies challenge prevalence while capturing the behavioural adaptations of firms, offering a holistic evidence base for targeted reform.