As value is in the eye of the beholder, experienced entrepreneurial startup (ESU) founders adopt a stakeholder value alignment approach in their business model design. Value is created, captured, and extracted through distinct three-dimensional (3D) business models that are technology- or problem-driven, market- or demand-driven, and exit-driven, designed to function simultaneously. Within these models, costs play enabling, mediating, and moderating roles. Effectual value creation arises from a triangulation of strategies focused on intellectual capital (IC) development, time and timing, and cost management. This approach introduces new technological, human, and financial dimensions to integrated strategic managerial accounting (SMA), viewing costs optimistically as enablers and mediators of new venture value. It challenges the traditional Contingency Theory view, which treats costs merely as moderators of profitability. This chapter begins by defining what a business model (BM) is—and what it is not. It explains how Knowledge Economy BMs are value driven rather than product-driven, dispelling common misconceptions that BMs are synonymous with B2B, specific technologies (e.g., blockchain), or subscription models like Monthly/Annual Recurring Revenue (M/ARR). Instead, products and services are outputs of value propositions, while technologies (e.g., automation, robotics, digitization, AI/ML) act as enablers and mediators of efficiency and effectiveness. Experienced tech and non-tech ESU entrepreneurs start by identifying the problems they aim to solve, becoming passionate experts in defining the problem and its impact (first step). They then align their solutions to the defined problem while measuring the resulting impact (second step). Finally, they select the appropriate technologies to implement these solutions (third step).