The Linear Sequential Models are used in the systems where the life cycle is long, in the development of large systems and / or in the systems where it is compulsory to meet some requirements with certain regulations. Systems with a long life cycle will be in use for a very long time, so carrying out the maintenance process without having requirements, design, development, modification etc. documents will cause too many resources (cost, time) to be consumed. For this reason, the Linear Sequential Model is used in the development of large-scale, long-lasting systems that comply with certain regulations.