Depending on your project type, scope, and requirements, you may choose to use either IEEE 1490 or PMBOK as your primary reference or guidance. However, you can also benefit from using both standards in a complementary way, as they can offer different perspectives and insights on your project. For example, you can use IEEE 1490 to gain a deeper understanding of the technical aspects and challenges of software engineering projects, and to apply the best practices and techniques for each software engineering knowledge area. You can use PMBOK to manage the overall project aspects and processes, and to align your project with the expectations and needs of your stakeholders and organization. You can also use both standards to cross-check and validate your project deliverables, quality, and performance.