The book spans the range from the factors influencing sales productivity to the implementation of sales processes. It addresses the fundamental questions of sales. The interested practitioner receives valuable contributions for optimizing their sales productivity, forecast accuracy, and leadership in sales. A more complex answer can be found in the considerations of systemic sales, communication theory, leadership in sales, and customer relationship management. Suggestions for practical implementation are provided for sales managers or dedicated salespeople in the form of sales processes, focusing on tactical and strategic sales processes as well as customer relationship management processes.