This introductory text provides a concise and practical introduction to the primary concepts and techniques of specially structured flowshop scheduling models to minimize the rental cost of machines taken on rent under a specified rental policy. Classical flowshop scheduling problems are under assumption that the processing times of jobs are always random. But there are significant situations where the processing time are not merely random but bear a well defined relationship to one another and hence, the concept of specially structured is significant in the field of scheduling. The concepts / illustrative examples format introduced in the text helps the readers to formulate the real world problem easily. The c++ programs under each section will enable the readers and industrial people to apply these concepts practically. This book is mainly oriented towards the Specially Structured flowshop scheduling models to minimize the rental cost. This book can be read without any prior knowledge theory and may be of interest to all people.