Abstract:There are suggestions that security may be an integrated part of any systems development method. One way to do this is to use a meta-methodology. With this theory as a leading star, a model, called the Pentagon Model is built as a bridge between The Systems Lifecyc\e (SLC) method and a company's security tools. The model describes what to do in order to develop more secure information systems, rather than a detailed description on how to do to succeed in this work. The level of security in the systems is determined by the context and will differ from case to case. This demands a flexible tool for integrating appropriate security solutions for each system. The Pentagon Model is designed to work together with the SLC, an approach used by most developers today. This way we eliminate the re-engineering of the model to fit in different projects, which might be necessary with a fixed and static model.