I wrote a rather controversial article last week comparing Obama vs. McCain using our 10-factor evidence-based assessment system. The stated purpose of the article was to propose that Presidential candidates should be vetted just as rigorously as any candidate for any job.

The underlying purpose was to demonstrate the point that many important decisions, especially hiring decisions, are based on invalid assumptions, false impressions, personal beliefs, and lack of objective data. (Join this Ning Recruiters Roundtable network to submit your views.)

With this article as a starting point, let me offer some expert advice on how to make really bad hiring decisions:

1.Make emotional decisions and justify them with facts.

Most interviewers make quick judgments about a candidate based on the four As C how attractive, articulate, assertive, and affable the candidate is. Candidates who pass the test are asked easier questions, with the interviewer looking for information to justify the positive impression. Contradictory and negative information is ignored. Candidates who dont meet the appropriate first impression standard are assumed incompetent, with the interviewer asking tougher questions and seeking only information to prove their initial emotional judgment. Why waste your valuable time? Instead, just conduct a five-minute interview and forget collecting any facts. It wont make any difference in your final decision, anyway.

2.Do not seek out objective data if it contradicts your beliefs or ignore it if you find some.

I remember meeting a very attractive and seemingly quite competent candidate for a VP HR spot, who gave a superficial answer to an HR strategy question. I had to fight with myself about whether to ask a challenging follow-up question which would prove she was unqualified on this important job criteria. After some soul searching, I asked the question, which she flubbed, and she was not presented. The point of this is that its very tough to eliminate a candidate you like, and even tougher to seek out positive information for candidates you dont initially think would fit. So rather than get to the truth, go the easy route, and trust your gut feelings and first impressions.

3.Make sure no one knows the real job.

The purpose of the interview is to determine competency and motivation to do the actual work required. If you dont know what work the candidate is actually going to be doing its impossible to assess motivation. Compentency, on the other hand, is pretty easy to figure out with just a rough understanding of job needs. Unfortunately, when you look at the underperformers in your company, youll discover most of them are quite competent to do the work, they just dont find the work theyre doing very satisfying. These are the people that need to be over-managed and pushed to achieve average results. So to make sure you hire more of these people, go out of your way to not tell the person youre hiring anything about the job until the day she starts. What a surprise that will be.

4.Use skills-based job descriptions to find, screen, and assess candidates.

The best candidates tend to have a track record of achievement, comparable (but not identical) skills, and are quick-learners. This is how the best talent is promoted within an organization. Yet, when hiring from outside we use a criteria that eliminates these top performers from consideration, seeking only those candidates who have exactly the right skills doing exactly the same work. The only people who fit this criteria are average candidates. So keep up the average work. While you wont get promoted, you will get hired.

5.Make sure your ads are hard to find.

When top people begin the job-hunting process they tend to seek out former associates, Google for jobs (e.g., software sales jobs Dallas), use social networking sites, or conduct some top-down industry research looking for the best industries and companies that meet their needs. If your jobs cant be easily found by candidates using these techniques, youll never see the best people. To continue not seeing any good people make sure you continue to post your ads on the major boards, where the best people look last.

6.Write boring ads that start with the req number.

If your ads are found, make sure theyre so boring that they preclude a good person from even applying. You can do this by leading off with the req number, a dumb title, telling the person whether the job is full-time or not, and if youll pay for relocation. Then go into a boring description of the job. Then make sure you clearly state that the candidate must not apply unless the person possess a laundry list of skills and experiences that was lifted from some job description written a few years ago.

7.Make sure that interviewers are untrained and can ask any questions they want.

Hiring mistakes are no big deal, so why not let anyone interview the candidate, ask any questions they want, and then ask them whether you should hire the person using whatever criteria they think appropriate. To make matters worse, only let untrained interviewers meet your candidates. This will certainly impress those top candidates you see regarding your companys level of professionalism.

8.Add up the yes and no votes.

Heres a sure-fire way to get the hiring decision wronglet each untrained, biased, emotional, and superficial interviewer have a full yes/no vote on who should get hired. Then to even out these errors, give a no vote more power than a yes vote, give unprepared interviewers the same voting rights as prepared interviewers, and then add up the votes. To make sure this process works as described, do not challenge anyones assessment, just in case the person might get offended. This is more important than the right answer.

9.Force candidates to formally apply before you can even chat with them.

Top people, when they just enter into the job-hunting process, have lots of questions and are comparing different companies and situations. One good way to prevent seeing or hiring any of these people is to not let them just talk with a recruiter or hiring manager unless they formally apply first. Most wont, but if you have some persistent person who still decides to apply anyway, make sure you have him complete a rigorous application process, submit a resume and a statement that everything stated is true. Of course, to make sure a good person doesnt sneak through this bureaucratic blockade, be sure not to contact the person for a least a week. Collectively, this will show the person you mean business.

10.Focus on compensation and skills rather than career opportunities.

Since the best people are more concerned with career growth, the opportunity to make an impact and want to know the broad details about the job before getting serious, we dont want to give them any of this information. Who knows, somebody good might actually be interested in and qualified for one of our open jobs. Instead, to prevent this from happening, dont discuss the job at all, first screen candidates only on their skills and then tell them what your comp range is. If there isnt a fit here, dont waste your time, just go on to another candidate. You certainly wouldnt want to ask candidates about some of their major achievements first and see if any of your other openings better match their needs. They actually might be interested in one of these jobs, despite the comp range. Wouldnt that mess things up?

You can see why these are my favorites rules for not hiring good people. What amazes me is that so many companies follow them and expect different results.