NHS Careers

Understanding an NHS Job Description & Person Specification

FP FrontlinePay Editorial
Updated September 2026

Independent guidance — not affiliated with NHS England or DHSC

Short answer

The job description tells you what the role actually involves day to day; the person specification sets out the essential and desirable criteria a shortlisting panel will actually assess your application against. You need to meet all (or very nearly all) of the essential criteria to have a realistic shot at being shortlisted — desirable criteria are a genuine bonus, not a second set of compulsory requirements, and are typically used to differentiate between candidates only once the essential bar has already been cleared. Panels are meant to assess strictly against what's written in the person specification and what you've actually evidenced in your application, which is exactly why mapping your answers explicitly onto each listed criterion, with specific examples, matters more than a general account of your career.

Job descriptions and person specifications are two of the most consistently under-read documents in the entire NHS application process, which is a shame, because reading them properly does two useful things at once: it tells you whether a role is genuinely right for you before you invest hours in an application, and it tells you exactly what a shortlisting panel is going to be looking for when they read what you submit. This guide explains the real distinction between essential and desirable criteria, how to read a person specification honestly before you apply, and how these criteria actually map onto shortlisting and interview scoring.

Two documents, two different jobs

NHS vacancies are almost always advertised with both a job description and a person specification, usually attached as a single document or two linked ones, but they genuinely do different jobs and are worth reading with different questions in mind:

Job description

Sets out the actual duties, responsibilities, reporting line and scope of the role. Read this to answer: is this genuinely the job I want to be doing day to day?

Person specification

Sets out the essential and desirable qualifications, skills, knowledge and experience used to assess candidates. Read this to answer: can I actually evidence what's being asked for, and should I apply?

A common mistake is reading only the job description, deciding the role sounds appealing, and then writing a generic application without checking the person specification closely enough to know whether — and how — to evidence what's actually being scored.

Essential vs desirable, properly explained

This is the single most important distinction in a person specification, and it's worth being precise about what each category actually means in practice, not just what the words suggest.

1

Essential criteria

These are the minimum requirements to be considered for the role at all. A shortlisting panel will generally only consider candidates who meet all, or very nearly all, of the essential criteria — this is the genuine bar for shortlisting, not a wish list. If you can't evidence an essential criterion at all, it's worth being realistic about your chances before investing time in a full application, though it's often still worth a brief enquiry to the named contact if you're close but unsure.

2

Desirable criteria

These are attributes that would strengthen an application but aren't required to be considered. They typically come into play once a panel has a pool of candidates who all meet the essential criteria and needs a fair way to differentiate between them — particularly for competitive, high-application-volume roles. Meeting some, but not all, desirable criteria is a normal, common position for a successful candidate to apply from.

ℹDon't self-reject over desirable criteria

A genuinely common, avoidable mistake is deciding not to apply because you don't meet two or three desirable criteria, while actually meeting every essential one. Desirable criteria exist to differentiate between qualifying candidates, not to gatekeep who gets considered in the first place — if you meet the essential requirements, it's almost always worth applying rather than self-selecting out over the "nice to have" list.

How to read a person specification before you apply

Reading a person specification properly, before you commit time to an application, is a genuinely useful filter — both for deciding whether to apply, and for knowing exactly what you'll need to evidence if you do.

  • ✓ Read the essential criteria list line by line and honestly ask, for each one, whether you can evidence it with a real, specific example — not just whether it sounds like something you've probably done
  • ✓ Note where a criterion says a specific qualification, registration or level of experience is required, since these are usually hard requirements rather than negotiable preferences
  • ✓ Check for any criteria marked as assessed 'at interview' or 'at application' — this tells you where to focus written evidence versus what to prepare verbally
  • ✓ Read the desirable criteria as a guide to what would strengthen your application, not as a second essential list — and don't rule yourself out over gaps here
  • ✓ Cross-check the person specification against the job description to see whether the day-to-day duties genuinely match what you want to be doing, not just whether you can tick the criteria boxes
  • ✓ Contact the named recruiting manager with a specific question if you're genuinely unsure whether your background would be considered against a particular criterion, rather than guessing either way

How criteria map onto shortlisting and interview scoring

Understanding how a panel actually uses the person specification demystifies a lot of what can feel like a black-box process:

  • • Shortlisting panels are meant to assess applications strictly against the criteria listed in the person specification, using only what's written in your application — not assumptions, prior knowledge of you, or unstated preferences
  • • Essential criteria are generally assessed first, and candidates not meeting them are typically not progressed to the next stage, regardless of how strong their desirable-criteria evidence might be
  • • Where a large number of candidates all meet the essential criteria, desirable criteria are commonly used to reduce the field to a manageable shortlist for interview
  • • Interview questions are frequently structured to map directly onto specific criteria from the person specification, particularly ones better assessed through a real-time conversation than a written form
  • • A structured scoring framework, applied consistently across all candidates for the same post, is standard good practice — reducing (though not eliminating) the role that subjective impression plays in the decision

Evidencing criteria properly on your application

Meeting a criterion in real life and clearly evidencing it on paper are two different things, and the gap between them is where a lot of otherwise qualified candidates lose out. A panel working strictly from what's written in front of them can only credit what you've actually made visible.

1

Map your answer explicitly to the criterion

Rather than describing your career history in general terms, structure your answer so it's obvious which specific criterion each part of your evidence is addressing.

2

Use a real, specific example

A genuine situation with a clear action and result carries far more weight than a general claim about your skills or personality. The STAR method (Situation, Task, Action, Result) used for NHS values-based interviews works equally well here.

3

Draw on any relevant experience, not just paid employment

Volunteering, placements, education, and significant personal responsibilities can all legitimately evidence a criterion, provided the experience is genuinely relevant and you're specific about the context.

See our values-based interview guide for more detail on structuring STAR examples — the same approach applies whether you're writing a supporting statement or answering at interview.

When your draft is ready, run it through our free NHS CV & Supporting Statement Checker for an instant check of figures, "I" versus "we" and NHS values wording before you tick off each criterion yourself.

Common mistakes candidates make

  • ✕ Reading only the job description and skipping the person specification — leaving you unprepared for what's actually being scored
  • ✕ Self-rejecting over desirable criteria instead of applying because you meet the essential ones
  • ✕ Writing general career summaries instead of specific, criterion-mapped evidence — leaving a panel unable to credit relevant experience you do have but didn't clearly connect to what was asked
  • ✕ Assuming a similar job title elsewhere means identical criteria, rather than reading the specific person specification for each vacancy
  • ✕ Not asking the named contact a genuine, specific question when unsure about eligibility, and guessing instead

Why trust this guide

  • ✓ Explains essential vs desirable precisely, rather than treating a person specification as a single undifferentiated wish list
  • ✓ Focuses on the practical gap between meeting a criterion and evidencing it, which is where many otherwise qualified candidates actually lose out
  • ✓ Written to work alongside our values-based interview and STAR-method guidance, not duplicate it
  • ✓ Independent and not affiliated with the NHS, DHSC, or any individual trust's recruitment team

Related guides

NHS Values-Based Interview Questions

The STAR method for structuring evidence at interview and in writing.

How to Find NHS Jobs Near You

Where to actually find the vacancies these documents come attached to.

NHS Jobs Application "Under Review" Explained

What happens after you submit an application scored against a person specification.

What to Do If You Don't Get the NHS Job

Requesting feedback tied to specific criteria, and reapplying constructively.

How to Join the NHS

The full application process, from route to start date.

The bottom line

Treat the job description and person specification as two different, genuinely useful tools: one tells you whether you want the job, the other tells you exactly what you need to prove to get shortlisted for it. Meet the essential criteria, evidence them with specific examples rather than general claims, and don't self-reject over a desirable list that exists to differentiate between qualifying candidates, not to gatekeep who applies in the first place.

Frequently asked questions

Should I bother applying if I don't meet every single desirable criterion? +
Yes, generally — desirable criteria are exactly what the name suggests: attributes that would strengthen an application, not a second tier of compulsory requirements. Most successful candidates don't meet every desirable criterion listed; what genuinely matters is that you meet all the essential criteria and evidence them well. Meeting some, but not all, desirable criteria is a completely normal position to apply from.
What if I meet the essential criteria but worded my application badly? +
This genuinely costs candidates interviews, and it's worth taking seriously. Shortlisting panels are generally only allowed to assess what's actually written on your application against the person specification — not what you may have meant, or experience you have but didn't mention. If you meet a criterion but don't clearly evidence it in your application, a panel working strictly from what's in front of them may not be able to credit you for it. This is exactly why explicitly mapping your answers to each listed criterion, using specific examples, matters more than simply describing your career in general terms.
Can a shortlisting panel reject me for something not actually on the person specification? +
They shouldn't, and this is a specific point of good recruitment practice — shortlisting decisions are meant to be made only against the criteria actually listed in the person specification, not against unstated preferences like a specific additional qualification, a particular previous employer, or personal characteristics that were never listed as requirements. If you strongly suspect a rejection was based on something outside the stated criteria, that's a legitimate thing to raise when requesting feedback.
Is the job description the same thing as the person specification? +
No — they're two different documents, usually published together but serving different purposes. The job description sets out the actual duties and responsibilities of the role: what you'd be doing day to day, who you'd report to, and where it sits in the wider team. The person specification sets out the essential and desirable criteria used to assess candidates — qualifications, skills, knowledge and experience. You need both to properly judge whether a role suits you and whether you can evidence what's being asked for.
How specific do my examples need to be when evidencing a criterion? +
Specific enough that someone who's never met you could picture exactly what you did and what the outcome was — a real situation, not a general claim. "I have excellent communication skills" evidences nothing on its own; a brief, concrete example of a time you used those skills in a relevant context does. The STAR method (Situation, Task, Action, Result) used for NHS interviews works just as well for structuring written evidence against a person specification criterion.
What if a criterion asks for experience I have, but not from paid employment? +
Use it anyway, as long as it's genuinely relevant — volunteering, work experience placements, full-time caring responsibilities, education, and even significant non-work responsibilities can all evidence a criterion if the underlying experience is real and relevant. Panels are generally assessing whether you can demonstrate a skill or quality, not exclusively where you got it from. Be specific about the context so the panel can judge its relevance properly.
Do essential and desirable criteria carry equal weight if I meet both fully? +
Not usually. The standard practice is to assess candidates against essential criteria first, since meeting all of them is generally the baseline requirement to be considered for shortlisting at all. Desirable criteria typically come into play as a way to differentiate between candidates who've all cleared the essential bar — useful when there are more qualifying candidates than interview slots, rather than being weighted equally with essential requirements from the outset.
Can the essential and desirable criteria differ significantly between two very similar-sounding jobs? +
Yes, genuinely, even for roles with an identical or near-identical title. A person specification is written for the specific post, team and trust advertising it, so criteria can vary based on local team needs, the exact scope of the role, or a trust's own way of describing requirements — which is exactly why it's worth reading the specific person specification for each vacancy you apply to, rather than assuming your experience with one job title automatically transfers to how a different trust has defined criteria for the same title.
What does 'evidenced at interview' mean if I see it noted next to a criterion? +
It means the panel intends to assess that specific criterion through interview questions rather than, or in addition to, your written application — commonly used for criteria that are hard to judge properly from a form alone, like communication style or handling a difficult situation under pressure. If you see this next to a criterion, prepare a specific example ready to bring out verbally, even if you've also touched on it in writing.
Is it worth contacting the recruiting manager before applying if I'm unsure whether I meet the criteria? +
Often, yes — many NHS job adverts explicitly name a contact for informal enquiries, and this exists precisely for candidates weighing up whether to apply. A brief, specific question about whether your particular background or qualification level would be considered is a reasonable use of that contact, and can save you time either way rather than guessing.

Free download: 2026/27 Agenda for Change pay scales

One page, every band, annual and hourly. We'll also send new application, interview and promotion guides as we publish them.

Free. Independent, not affiliated with the NHS. Every email has an unsubscribe link. See our privacy policy.