Book excerpt: This book is for business architects. "Expert systems based on ontogenetic maps" opens the possibilities to deal with the objective knowledge included in the ontogenetic maps for decision making. Unicist expert systems are second opinion systems to ensure the quality of business decisions in the field of diagnoses, strategies and business architecture. The unicist expert system uses ontogenetic maps that allow evaluating the functions involved and their validity, considering the threshold of "energy" that is necessary for each process. Every function is a business object in itself that has to be consistent with the rules of the unified field of the business and the evolution laws. The nature of adaptive systems in business demands the existence of catalysts, to accelerate processes and entropy inhibitors to maintain the focus of the energy that is being used. Catalysts and entropy inhibitors are necessary when a business process needs to generate additional value. Without them, the trend towards the actual value generation prevails. This book presents a real application of the expert system and its over-simplification in a "5-click Strategy" to be used in selling processes of differentiated products or services. The functionality of an expert system is its use to provide a second opinion diagnosis - to validate diagnoses, strategies and architecture -that integrates the necessary ontogenetic maps to define the possibility of developing successful actions.