They were so desperate for a job or so worried about impressing the employer that they accepted the position knowing little more about it than was in the want ad. That's like buying a car based on a brochure.

Here's how to boost the chances that your next job will be your best yet:

• Make sure you do a thorough job search. One key: lining up lots of interviews and multiple job offers. That will give you the confidence to carefully vet each prospective job. (Tips for lining up lots of interviews in a short time can be found in "The One-Week Job Search.")
• During interviews, ask penetrating questions: "What will I be expected to accomplish in the first few weeks?" "Did someone hold this position before? Why did he leave?" "How would you describe the office culture?" "What sort of person is happiest in this job?"
• Before accepting a job offer, ask your prospective boss to tell you more about the work you'll be doing. And don't be afraid to raise awkward issues: "Every boss is different. What's key to working well with you?" and "How many hours a week will I be expected to work?"
• Ask if you can visit the worksite. Assess the feel of the place: Do the workers seem engaged but not overworked? Content or disgruntled? If you can, ask employees at their desks or in the break room if there's anything you should know before deciding to work there. Is there a lot of turnover? Why?

Of course, some employers won't be candid, but you'll probably learn something of value. There's nothing to lose by asking. The time it takes to carefully vet your next job could improve your life more than hours spent on most other things. Take the time.