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Writing Job Descriptions, Job Specifications, and Position Details
Human Resources Management · Chapter 3: How Management Theories Shape the Way Jobs Are Built and OrganizedSection 3.11 · lesson 21 of 9115 min · free with a free account
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In this lesson
Trace every requirement to the work, and keep the record current.
- Separate job, person, and post documentation
- Write observable duties with purpose and scope
- Document essential functions before recruitment
- Test requirements and maintain the evidence
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How Management Theories Shape the Way Jobs Are Built and Organized
Writing Defensible Job Documents
Job documentation supports recruitment, selection, appraisal, pay, training, and accommodation. Its purpose extends well beyond completing an administrative form. Weaknesses in the documents reappear later, as problems in every process that depends on them. A job description explains the work; a specification explains what the person needs to perform it. A position description identifies the particular post, including its reporting line and specific duties. Keeping those questions separate prevents preferred personal attributes, from becoming unsupported entry requirements. A defensible description records identification, purpose, duties, reporting relationships, conditions, and physical work demands. Essential functions need careful documentation, because the accommodation framework distinguishes fundamental duties from incidental ones. Duty statements require an observable action, an object, a purpose, and enough scope to define the work. Requirements must be traceable to those duties, with evidence supporting the level the employer chooses. The Northgate case replaces an unsupported degree proxy, with a direct assessment of the actual task. The final exercise shows how stale descriptions and missing assessment records undermine a selection decision.
3 Documents
Different Questions Support Different Decisions
The job description states the job's purpose, duties, responsibilities, and the conditions under which work occurs. Managers, incumbents, appraisers, and evaluators use it, to establish what work is expected. The job specification states what a person requires. Those requirements concern knowledge, skills, abilities, and other characteristics. Recruiters and selectors use it, to define eligibility and choose how applicants will be assessed. The position description covers an individual post, rather than every job with that title. It records the particular location, reporting line, and any duties specific to that post. The first two questions are often collapsed, letting desirable personal attributes enter as apparent necessities. A duty describes work the organization needs done; a requirement makes a claim about the person. That claim must be derived from the duty, and defended by reference to the actual work. An unsupported requirement cannot be justified, merely because it appeared in an earlier specification. For each document, name the decision it supports, so its practical purpose remains clear.
Description Components
Identify the Job and Explain Its Purpose
Identification records the job title and department or function. It also records the grade and last-review date. The review date makes currency visible, rather than letting an old document silently pass as current. A job summary explains what the role exists to achieve, in two or three sentences. It gives the duties a shared purpose, rather than presenting an unexplained list of accumulated tasks. Essential duties and responsibilities describe the substantive work, which the postholder is expected to perform. They should distinguish important results and activities, without becoming a diary of every incidental action. The summary and duties must correspond, so the stated purpose actually explains the work listed. These elements also support appraisal and grading, by identifying the job rather than the incumbent's preferences. They form the first half of a defensible description, with relationships and working conditions following. The record establishes expectations, so later processes use the same account of the job. Clear purpose and specific duties make the description usable, before any personal requirements are added.
Description Components
State Relationships, Conditions, and Work Demands
Reporting relationships state who the job reports to, and which roles report to it. Working conditions describe material features, including outdoor work, shifts, travel, noise, or temperature. Physical demands should describe the work being performed. They should not simply presume an attribute of its performer. Saying the person must repeatedly lift twenty kilograms states a requirement about the person. Describing cartons up to twenty kilograms, moved from pallet to conveyor, states the actual work. A defined rate clarifies the demand, alongside the weight and transfer route. The description leaves open how work is performed, including different methods or equipment. That distinction makes the record more useful, for training, evaluation, and possible accommodation analysis. The work still has a real physical demand; accurate description does not make it disappear. Identify the result and conditions, without assuming only one method can achieve them. Relevant demands give later decisions a work basis, rather than an unsupported personal ideal.
Essential Functions
Fundamental Duties Differ from Incidental Ones
Essential functions are the fundamental duties of a job. Marginal duties are incidental to that work, creating a different classification. The Americans with Disabilities Act of nineteen ninety requires attention to that distinction in employment. A qualified individual can perform the position's essential functions, with or without reasonable accommodation. The Equal Employment Opportunity Commission enforces the employment framework, which examines the actual position. Job restructuring can redistribute marginal functions, when that is an effective accommodation in the circumstances. An employer is not required to remove an essential function, as the accommodation itself. How or when a function is performed may still change, depending on the individual circumstances. The distinction concerns fundamental work, rather than requiring the existing method to remain fixed. Accommodation also has applicable limits, and requires an individualized assessment rather than a generic conclusion. A contested request needs legal advice, with accurate documentation making that assessment possible. The discipline here is to describe the actual function, and preserve evidence before a dispute arises.
Evidence of Essentiality
A Label Alone Does Not Decide the Function
Several considerations help determine essentiality, rather than the employer simply placing a label beside a task. Ask whether the position exists for this function, connecting it to the job's purpose. Consider time spent on it, and the consequences if the postholder does not perform it. Examine how many other employees are available, among whom the function might be distributed. Specialized expertise can also explain why a function belongs, fundamentally, to this particular role. Employer judgment matters, alongside actual experience of current and former postholders doing the work. A written description prepared before advertising or interviewing is evidence, but is not necessarily conclusive. The employer's document does not settle every question, simply because it was written down. Other evidence and the actual job still matter, when the essential-function question is assessed. Preparing the record in advance preserves contemporaneous evidence, rather than trying to reconstruct it after disagreement. Use the considerations together, and seek advice where the particular function or accommodation is contested.
Duty Statements
Write an Action, Object, Purpose, and Scope
A usable duty statement names an action, object, purpose, and scope defining its coverage. Vague phrases such as assists or handles fail to specify an observable, assessable action. The finance example specifies preparing a monthly accruals schedule, and reconciling it to the ledger. Completion before the third working day supplies timing, giving the duty an assessable boundary. The supplier example specifies agreeing delivery schedules, and resolving invoice queries within a stated authority limit. Its portfolio of approximately forty suppliers supplies scope, rather than an unlimited relationship responsibility. The supervisory example replaces supporting performance, with monthly individual reviews for each team member. It also requires recording agreed objectives and outcomes, making the action and evidence explicit. Training and appraisal can now refer to observable work, making the improvement practical. Selection criteria and essential-function analysis can also examine the actual activity being performed. State the action, purpose, and coverage, instead of relying on an impressive vague phrase.
Job Specification
Convert Duties into Necessary Requirements
The specification converts duties into knowledge, skills, abilities, and other characteristics, commonly grouped as KSAOs. Each requirement needs a necessary, job-related basis, traceable to a duty in the description. Inflation begins when the manager describes an ideal person, rather than what the work genuinely requires. It can copy the previous incumbent's attributes, without testing whether the job needed them. A high bar may be chosen to reduce applications, replacing evidence with a convenient filter. The practical cost is greater difficulty filling the role. Fewer applicants meet the specification, and vacancies therefore last longer. Include that vacancy cost, when considering whether a higher requirement actually serves the organization. Degree requirements deserve scrutiny, including whether the degree supplies knowledge necessary for particular duties. Stated years of experience also need evidence, rather than a number inherited by convention. Ask which duty requires it, and why the chosen level is necessary for performance. Documentation supplies that connection, allowing the criterion to be tested instead of merely accepted as traditional.
Selection and Legal Exposure
A Neutral Requirement Can Still Be Challenged
Selection requirements can create legal exposure, as well as making a vacancy harder to fill. Title Seven of the Civil Rights Act of nineteen sixty-four includes a statutory disparate-impact framework. It addresses particular practices causing disproportionate exclusion, on protected grounds even when the practice appears neutral. The framework includes whether the challenged practice is job-related, and consistent with business necessity. Alternative practices can also matter; a duty connection does not settle every legal issue. The useful documentation discipline remains to connect each criterion, to specific work and supporting evidence. A degree used only as a general capability proxy needs scrutiny, rather than automatic acceptance. The same applies to undefined communication requirements, or years of experience unsupported by the duties. Whether a contested criterion is lawful depends on the particular case, and requires legal assessment. HR supplies accurate analysis and records, rather than declaring the result from a checklist. Test the actual work where possible, preserving evidence about the criterion and the assessment used.
6 Uses and Maintenance
Keep the Record Aligned with Actual Work
The documents feed six important processes within the organization. Their accuracy is therefore a shared dependency across those activities. Recruitment describes the role and attracts applicants; selection derives criteria and applies them. Performance standards use duties; pay evaluation assesses the documented job, rather than its title. Training compares capability with requirements, and accommodation analysis examines the essential-function distinction. Poor documentation produces unclear expectations, unsupported criteria, contested functions, and inconsistent grading. The record also becomes stale, as informal duties accumulate and systems alter how work is performed. Reorganizations can move responsibilities, without anyone updating the documents that still describe the previous arrangement. Maintain a stated review cycle, and trigger review at every vacancy, grading review, or significant change. The vacancy is particularly valuable, because the description is about to guide an actual recruitment decision. The outgoing postholder may still be available, to explain what the role now involves in practice. Use that opportunity to update duties, before the old document generates another set of inaccurate requirements.
Composite Case
Northgate Replaces a Degree Proxy with a Work Assessment
Fictional Northgate Logistics requests a bachelor's degree, for its difficult-to-fill scheduling coordinator vacancy. The manager has experienced two unsuccessful hires for the role. He now wants a stronger indication of analytical ability. His justification is the previous postholder's degree, rather than knowledge a specific duty requires. The six duties include daily route planning, and reallocating loads when a vehicle becomes unavailable. They also include driver calls, maintaining hours records, a weekly template report, and service-failure escalation. The analytical work is specific to the scheduling system, and is learned on the job. None of these duties supplies the claimed degree requirement, in the fictional case as described. The accepted change removes the degree proxy, and introduces an assessment of the manager's actual concern. Applicants use anonymized route data, to reallocate loads against a stated constraint in a short exercise. That adds a selection stage, but tests the duty rather than an unsupported proxy for capability. The original requirement's lawfulness remains a legal question; documentation supports advice if contested.
Reverse Problem
A Stale Description Cannot Explain an Unrecorded Assessment
The reverse exercise concerns an internal applicant, challenging a selection decision with several documentation failures. The description is six years old, omitting two duties now dominating the role. Its advanced spreadsheet requirement therefore lacks a current documented connection, to the work being selected for. The successful candidate was assessed on that requirement, while the complainant was not assessed consistently. No scoring record remains, preventing the organization from checking how the assessment affected the decision. The missing historical assessment evidence is especially difficult to repair, after the selection has already occurred. Updating the description cannot recreate the original assessment record, or show its scoring. A vacancy review would identify current duties, derive necessary criteria, and establish a consistent assessment plan. Preserved scores explain the decision, instead of requiring a retrospective account without supporting records. Job documentation works when it stays current, links person requirements to duties, and supports observable decisions. The next lesson takes the documented job, and evaluates its relative worth within the organization.
About Human Resources Management at UPI Study
Human Resources Management (Business 306) is a self-paced online course of 91 video lessons in 12 chapters, from what HR does and how jobs are designed to hiring, training, performance reviews, pay and benefits, safety, employment law, unions, global staffing and remote work. It carries a NCCRS credit recommendation for 3 semester credits.
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