You probably already know not to ask the CEO of your company to write your business school letter of recommendation – unless of course he or she is  someone you work closely with and who knows you very well.

Below are three more potential pitfalls when it comes to selecting a recommender. Avoid these mistakes or you may find your chances of admission crushed despite having an overall compelling application.

• Don't select someone who can't answer the questions: In other words, you may feel tempted to choose someone who knows you inside and out, but not in a professional setting. He or she can speak to your love of soccer, your compassion and your integrity, which are all great attributes. But this person cannot answer the specific career questions recommenders must address.

Business schools typically ask recommenders to evaluate how the candidate's potential, performance or personal qualities stack up against those of other individuals in a similar role.

We worked with one client, Mike, when he was applying straight out of college. He had done a few short internships during college, but had no full-time work experience to draw from or a supervisor to tap for a traditional recommendation.

Mike had a stellar academic record, but a choosing a professor is rarely a good choice for a business school reference, no matter how cordial the teacher-student relationship. However, once we learned that Mike had worked as a teaching assistant for one of his professors, we knew we'd found someone who could better speak to the types of questions asked. Though unconventional, the recommendation from a professor became the right choice for Mike.

• Don't select someone who is not an advocate for you going to business school. This may sound strange, but plenty of successful and well-positioned professionals won't understand why you would want to go to business school. They may even be actively against it. Maybe they don't want to lose you as an employee for two years, or maybe they aren't really your biggest fan.

Our client Todd worked in finance in an office that didn't require the MBA degree for promotion, and many higher-ups scoffed at its value. While his boss agreed to write the recommendation and had plenty of good things to say about Todd, he sort of laughed it off and clearly would not act as a true advocate for him going to business school.

Todd worried about what might happen if one of his target schools called his boss to discuss the reference, and that uncertainty was just too stressful. He decided instead to choose his supervisor from a prior position, someone with whom he had kept in touch and discussed his graduate school plans with quite a bit.

Choose people who like you, who care about your success and who think you're good at what you do. Choose capable writers who can express their opinions clearly. If a potential reference seems less than enthusiastic in any way, keep looking. That person's ambivalence will likely come through in the letter.

• Don't select a person who doesn't know who you are and where you stand now: If you worked with someone four years ago and have not done a good job of staying in touch, that person really cannot comment on your progress and skills today.

We worked with one client, Guillaume, who was reapplying to business school after receiving a series of setbacks the previous season. Upon reviewing all of the components of his previous application, it quickly became apparent that a feeble recommendation letter had likely weakened his otherwise strong candidacy.

He had gone to a supervisor from a previous position, and while he left on good terms personally and professionally, Guillaume had never felt fully comfortable at the firm, which was why he resigned to find a job he felt more passionate about. Unfortunately, it appeared Guillaume's supervisor had also perceived his lack of enthusiasm for his job.

Having few years of distance from Guillaume's work, the former supervisor wrote a recommendation that would appear polite and generally positive upon hurried review, but a closer read revealed some deliberate omissions and even a few veiled criticisms. In this case, the recommender's letter was actually damning with faint praise. 

When considering potential references, ask yourself whether the person has worked closely with you, thinks favorably of you, and will put in the time to write a thoughtful, detailed endorsement of your candidacy. If you can't answer yes to these three requirements, move on until you find the person who fits the bill perfectly. Your chances of admission to the school of your dreams may well depend on it.