To avoid surprises, organizations have to make prior assessment for knowledge, skills, experience and past performance w.r.t. work output, quality of work, and safety performance. Medical or health records are also to be verified to ensure that persons are healthy and ready to work with 100% deliverables. Health issues should not impede performance. i.e. to say, person may be at site but output should be same as that of perfectly healthy professional.
Supervision is also essential and an effective supervision is highly appreciated. Many failures are due to non consideration of these aspects. One can have performance review on daily/weekly basis depending upon the nature and duration of the job. Frequent assessment during initial period will help to guide the persons in right direction and will same time and money.