Whether you are writing your first resume or updating an older one, remember to stop and think about which key words to add to your resume. You could get lost in the sea of applications if you do not make your qualifications and key words pop out to the hiring managers.
To do this, focus on the open job announcement's "QUALIFICATIONS, SKILLS and REQUIREMENTS". This may take some time because it is important to have the resume geared exactly for the open position!
Your resume needs to pass that initial scan test from hiring managers and recruiters. From my human resources and recruiting experience, the first thing that is looked at when scanning the resume is "the qualifications". Showing that you are qualified will help you make it to the next step in reviewing your resume - you do this with key words! You want to ensure the critical information jumps out off the page!
If you would like a free review of your resume, I would be happy to look at and give you feedback.