The main purpose of the new publication is first of all to make ship designers and operators realize that stability rules are not perfect and their fulfillment does not mean that the ship will be safe in all conditions. Secondly, to present Onboard Stability Documentation standard which enables better understanding of ship stability and increasing its safety. Part I includes basic knowledge on ship hydrostatics and stability, presentation of current rules requirements concerning stability as well as information on ship’s behaviour in waves. Furthermore, it contains descriptions of stability accidents and proposals of design solutions which increase ship collision safety and survivability after damage. Shipyards prepare stability documentation according to their standards. Very often the documentation is difficult to understand and of little practical value. It is no surprise that it is just put aside. The solution which may lower costs of stability documentation, increase its quality as well as practical value is Onboard Stability Documentation standard. Easy to understand and logical standard will significantly facilitate and accelerate documentation approval process in Classification Societies but above all it will make officers’ work easier and increase ship stability safety. Proposal of such a standard for dry cargo vessels is presented in Part II of the publication. The book is addressed to a wide circle of professionals involved in ship design, approval of stability calculations and documentations, survey and operation of ships. It should be of interest to ship design offices, ship manufacturers, shipping companies (owners and operators), education institutes and others concerned with ship stability.