In any industry, your resume should contain only information that is relevant to your current job objective. Technical resumes pose a special set of problems for a variety of reasons. In some technical arenas, it is not uncommon to change jobs frequently or to do contract work. Many technical jobs are project-based. Other technical personnel may find that with rapidly changing technology, their resumes are packed with technical certifications and professional development courses.The result can be a too-lengthy, confusing resume. Don’t fall into the trap of feeling that you must include everything you’ve done in your career on your resume. It simply isn’t true. In fact, the opposite is true.For IT resumes, including irrelevant information can simply make you look outdated and unqualified for the job. This is especially true when determining which technologies to include in your job history or in a technical tools section of the resume.Technology terms are often used as keywords to filter the best resumes, so make sure you are up to date on the latest technology for your industry. Consider the type of job you are seeking. If you are a programmer, you’ll probably want to include all the programming languages and tools you’ve used at least in the last 10 years. For a network administration role, don’t list operating systems older than seven years.There is no specific rule of thumb that applies to all technology jobs, so use your best judgment in identifying those technologies that are both relevant and recent enough to include on your resume.