Once you know which recommenders you want to seek out, approach them well in advance. Give them a months notice (or more) - the fall season is a busy time for everybody and chances are you aren't the only person asking for recommendations.

When you do approach the recommender, you need to go prepared. I personally always brought all the documents that I needed to give to the recommender in a folder that he/she could keep. You should bring in the folder:

1.) The recommendation form for the college(s) that you are applying to
2.) An addressed and stamped envelope (make life easier for the recommender)
3.) When the recommendation needs to be completed (the recommender will usually just mail it if #2 has been fulfilled)
4.) A résumé, which you may need to explain to the recommender so he/she will know where to look in citing evidence of your talents
5.) Another sheet with points that you think should be emphasized and are valid (e.g. if you want your involvement in student government to be highlighted)

The fourth point is especially relevant if you can have your two different recommenders talk about slightly different topics. Your Physics teacher may be able to go more indepth about the outstanding aerodynamics research you did whereas your History teacher can rave about your participation within Model UN. Thus you can achieve specific descriptions of what you've done while still covering the expanse of your accomplishments.

When everything is said and done, and the college application deadline nears, ask the recommender again if the references have been sent in. Also, one last point, do not forget to send thank you notes/a small present to those who wrote your recommendation (after they write it of course!).

To read more about recommendations and finding the right recommender, click here.