Job Description · JD
Job Description
What is a job description?
- The reference document shared by hiring, evaluation, and compensation
- The key is weighting and accountability, not a list of tasks
- Review it at least once a year to keep it useful
The difference between organizations with and without job descriptions isn't a single document; it's the quality of the conversation. Without one, a hiring meeting starts with 'Our team is short-staffed' and ends with 'Then let's hire someone with about 5 years of experience.' With one, the discussion begins with which part of this job's accountability is currently unfilled. Appraisal meetings change the same way: instead of a manager's impressions, you lay out the scope of responsibility written in the document and confirm how much the person actually delivered.
Three documents that often get mixed up in practice should be kept separate. A duty assignment sheet lists who handles what, organized by person. A job description is organized by job and stays valid when the person changes. Pull out just the required qualifications and competencies and you have a job specification. A practical test: does the document still make sense with the person's name removed? Keep it to one or two A4 pages, with 5 to 7 main duties whose time shares add up to 100, and it can go straight in as input for job evaluation.
The author should be the line manager, not HR. HR controls the template and terminology and runs the interviews, but the task list and weightings stay true to reality only when written by the person who actually assigns the work. Update the document after a reorganization, a new job, or a core system replacement. Even if nothing happens, it is safer to schedule a regular annual refresh. Keeping an update history at the bottom makes jobs untouched for years visible at a glance.
The most common mistake is the last line: 'Other duties as directed by a supervisor.' The moment that line goes in, the five items before it become suggestions, and at appraisal time the defense that 'that wasn't my job' is answered with 'that's why the catch-all item exists.' Another is a document that simply transcribes one particular person. If the side duties that person accumulated over ten years are listed as requirements, it becomes a job no one can be hired to replace. Adding more than ten lines of preferred qualifications also leads applicants to screen themselves out, so the applicant pool itself shrinks.
Jongmu KimSpecialist in corporate talent development and job skills
John KimJohn Kim, CEO of Nanum Consulting and author of B2B Marketing DesignAs scientific management and job analysis techniques developed in the early 20th century, documenting a job's content and requirements became standard practice, and the document later became the common foundation for hiring, evaluation, and compensation systems. In Korea, it spread with the rollout of the National Competency Standards (NCS).
Company A is an auto parts manufacturer with 180 employees. Over the past three years it hired 24 experienced professionals, and 9 of them left within a year of joining. Exit interviews repeatedly turned up the same comment: 'The job isn't what we were told.' Its job descriptions had been written for the 2019 ISO audit and never touched since. (Hypothetical example)
- When the HR manager spread the existing documents for production planning, quality, and purchasing on the meeting table, the quality manager pointed out, 'The incoming inspection listed here was handed to a partner company two years ago.'
- We collected two weeks of work logs from 7 line managers and calculated time shares. For the quality engineer role, 38% of total time went to handling customer complaints, which appeared nowhere in the job document.
- They cut 14 minor tasks that each took under 5% of the time and narrowed the list to the 6 duties carrying the most responsibility. The HR head was firm: 'Let's delete every line that says “other assigned duties.”'
- When separating required from preferred, the purchasing manager's demand for 'hands-on import customs experience' was moved down to preferred, because only 1 person hired in the past three years had that experience.
- Job posting copy and appraisal form items are now derived directly from the revised documents, and reconfirming work weightings is a standing agenda item at the managers' workshop every January.
- One year later, departures within a year of joining among experienced hires fell from 9 to 2, applicants per posting rose from an average of 12 to 27, and appraisal appeals dropped from 11 to 3.