Creative an effective resume is difficult and can be confusing for many job seekers.  The good news is that there are many resume writing tips to consider and use.  Using a fully functional-style of resume isn’t a good way to go when a job candidate has gaps in their employment history.  When job candidates are trying to prepare their resume and they need to decide what is the best way to handle this gap of time in their employment history. Mentioning functional skills as a header and listing several relevant achievements that relate to those skills.  Although this strategy will cover the gap in time within the resume however HR hiring managers and professional may be able to see that a functional resume was used to hide things.  This will affect the way the reader perceives those issues and may think it is bad. 

Provide a chronologically employment list of your work history and create a detailed profile sharing functional skills.  This will help potential employers and hiring recruiters who can easily follow the sequence of your work history and overall employment.  It’s important to check your online presence by doing a Google, Twitter, and Facebook searches of your name.   Don’t write a resume that is longer than two pages to three pages.  A maximum of two pages is enough to share with a potential employer your work history, achievements, and goals. For job seekers with a highly technical field then a third page may be necessary.  Job candidates who are in search for academia positions or jobs overseas will need to have a CV type of resume which is longer than three pages. 

Reference:  http://www.quintcareers.com/resume-dos-donts.html