If you have stated a skill in the summary portion of your resume, you need to support it through an example of your related accomplishment in the experience portion of your resume, whether you are using a functional or chronological resume format, writes Sherri Edwards in her article for Quint Careers, Ten Resume Tips.
Describing a specific incident, event, work experience, or project will show evidence or “prove” you have a specific skill. Fancy language may appear engaging, but for the discerning decision maker, it does not take the place of facts. Facts sell. Using concrete examples in your resume will also prepare you for your interview. Using vague statements may get you in the door, but at some point, you will have to come up with specifics to make it real. Better to do it now than assume you will be able to produce supporting details on cue during and interview without preparation.