Checked 14 October 2026. The Case Study description, the answer formats, the 7-day deadline and the December 2026 results line are from the Civil Service Careers online-tests page for 2027 entry, read on 14 October 2026. The wording for the last campaign is from our copy of the same page saved on 28 September 2026. Formats can change between campaigns.
The Case Study assessment is the second of the two Fast Stream online tests, and the one the official page describes most briefly. For 2027 entry the whole description is six sentences and a rating scale. This guide prints those sentences, separates what they say from what candidates assume, and then shows how to practise both answer formats with the one worked example the Civil Service publishes and with our own practice case study. Applications for 2027 entry are open from midday 8 October to midday 5 November 2026. If you want the overview of both online tests first, start with our Fast Stream online tests guide.
A note from us
Applying to the Fast Stream is a big step, and there is a lot to take in. We have tried to set out what is published as plainly as we can. Take it one section at a time, and come back whenever it helps.
Civil Service Careers, online-tests page for 2027 entry (read 14 October 2026).
Where other pages get this wrong
For 2027 entry the Case Study uses two answer types. Some situations ask for the most and the least effective response; others ask you to rate several actions on the four-point scale.
Commonly published instead: four responses to every situation, with one “most effective” and one “least effective” pick, and nothing else. That was the official wording for the last campaign.
Our copy of the page saved on 28 September 2026 (the 2026-entry wording) said you would be presented with four responses to each scenario and identify both the most effective and least effective response. The page for 2027 entry no longer gives a number of responses and adds rating questions. Prepare for both formats.
What the official page says, sentence by sentence
| Official wording (2027 entry) | What it tells you |
|---|---|
| “This test assesses your decision-making and your ability to adapt to changing circumstances.” | Two things are being judged: the quality of each decision, and whether your decisions keep up as the facts change. |
| “You will take on an imaginary role, where you will review background information and respond to a series of challenges.” | You answer as the person in that role. What the role may and may not decide is part of the material. |
| “This is an evolving scenario. You will be presented with 7 pieces of background information, followed by 24 situations you need to respond to.” | One storyline, not 24 unrelated questions. The background stays relevant to the end. |
| “In some scenarios, you will be asked to identify the most and least effective responses.” | A ranking task: find the two ends of a set of responses. |
| “In other scenarios, you will rate the effectiveness of several possible actions on the following scale:” | A rating task: each action is judged on its own, on the same scale as the Work-based scenarios test. |
| “The tests are untimed, so you can work at your own pace.” | No clock inside the test. The only deadline is the 7 days. |
The middle column is quoted exactly from the online-tests page as read on 14 October 2026. The right-hand column is our reading. Note that the page uses the word “scenarios” in the two format sentences for what it calls “situations” one line earlier; we read both as the same 24 items.
The four-point scale used in the rating questions
| Rating | Official definition |
|---|---|
| Counterproductive | an unacceptable action that would make the problem worse |
| Ineffective | a poor action that would not help |
| Partially effective | a useful action that would be of some help |
| Effective | a good action that would help resolve the situation |
The Case Study section of the official page prints this scale a second time, word for word the same as in the Work-based scenarios section. So the rating questions in the Case Study are answered on the scale you have already learned for the first test.
The two answer types compared
| Point | Most and least effective | Four-point rating |
|---|---|---|
| What you do | Pick one response as the most effective and one as the least effective | Give every listed action its own rating |
| What the official page says | Used “in some scenarios” | Used “in other scenarios”, for “several possible actions” |
| Can two options get the same answer? | No: one most, one least (our reading of “the most and least”) | Yes. In the official worked example two of the four actions share the rating Ineffective |
| The skill (our reading) | Comparing responses with each other | Judging each action against the four definitions |
| Typical slip (our reading) | Choosing the response that merely does nothing as “least”, when another one makes things worse | Calling every sensible-sounding action Effective |
| How many of the 24 use it | Not published | Not published |
The two formats reward the same judgement from different directions. If you can rate four actions correctly on the scale, the most and the least effective fall out of the ratings. The reverse is not true: you can find the two ends of a set and still be unsure where the middle two sit. That is our reasoning, not a published marking rule, but it is why we suggest practising ratings first.
Practise the most and least format on the one official example
The official example-question page gives four actions with a “Correct rating” and an explanation for each. It is written for the Work-based scenarios test, and the Fast Stream pages publish no Case Study item at all. The four ratings are still the best official material for seeing how a most and least question resolves.
| Action | Official rating | In a most and least question |
|---|---|---|
| A. Contact the other department’s manager and request that they find alternative IT equipment | Ineffective | Neither end |
| B. Speak with the other manager about your concerns and share a contact who has similar equipment that is underused | Effective | Most effective: the only action rated Effective |
| C. Ask your colleagues to tell the other manager that your project takes priority | Ineffective | Neither end |
| D. Ask your colleagues to book as much time as possible with the equipment | Counterproductive | Least effective: the only action rated Counterproductive |
Great works are performed not by strength, but perseverance.
Look at what separates the least effective action from the two Ineffective ones. Actions A and C fail to solve the problem. Action D, in the official explanation, “creates conflict rather than resolving the resource issue”. An action that leaves things as they were sits above an action that makes them worse. That ordering is built into the scale’s own definitions, which is why learning the scale also prepares you for the ranking questions.
A worked Case Study situation from our practice set
The situation below is copied from the free part of the ProSyllabus Fast Stream practice set: the “Open Door Hubs” case study, situation 2 of 24. It is independent practice material written in the most and least format. It is not an official question, and the department in it is fictional. We include it because the official pages show no Case Study item, and because it shows how an answer depends on the background information.
Your role and the two background items this situation turns on
- Role: You are the Delivery Officer in the Community Access Unit of the Department for Local Services (a fictional department), joining the team in mid-June to help run the Open Door Hubs pilot. You report to the Programme Manager and work with regional leads, a training supplier and the libraries that host the hubs.
- Budget and timeline (extract): Total budget £1,200,000: hub grants £720,000 (£60,000 per hub for the six months); training contract £240,000; evaluation £90,000; communications £50,000; contingency £100,000. Only the SRO can release contingency, and any release above £25,000 also needs Programme Board approval.
- Email from the SRO, Helena Marsh: “Welcome to the team. Three things matter to me. First, honest reporting: I would rather hear bad news early than be surprised at the Board. Second, the Minister’s private office is following this pilot, and all contact with it goes through me or Tunde. Third, nobody should promise hubs money beyond their grant. If a hub needs more, bring me the case and I will decide.”
From the free part of our practice set. The full case study has seven background items; these are the two this situation depends on, with the role description.
Situation: Farah Iqbal, the North regional lead, emails you. Her four hubs are struggling to keep volunteers because travel costs are not covered. She asks you to confirm an extra £5,000 per hub, adding that £20,000 is small beside the contingency and that she needs “a quick yes” to pass on to the library services today.
| Response | Key in our practice set | Why |
|---|---|---|
| Confirm the £20,000, since it is well within the £100,000 contingency and would keep the volunteers. | Least effective | It commits public money you have no authority to commit, and the library services would act on a promise that may have to be withdrawn. |
| Forward her email to Owen Davies in finance without comment and leave him to reply to her. | Neither | Not keyed as an end. |
| Tell Farah you cannot agree funding, ask for her evidence and take the case to Tunde. | Most effective | Helena’s email says nobody should promise hubs money beyond their grant and the budget note says only the SRO can release contingency; being straight with Farah while moving her case forward is honest and keeps things moving. |
| Suggest that she raises it at the next regional leads’ call so that everyone can hear it together. | Neither | Not keyed as an end. |
The point of the example is the method. Nothing in the situation itself says who may release contingency. That rule is in the background, read several screens earlier. The most effective response is the one that respects it and still moves the request forward; the least effective is the one that breaks it. The key is ours and is not an official Civil Service answer. Situation 1 and this one are free in the practice block on this page, together with the first of the 12 work-based scenarios.
How to read the seven pieces of background information
The official page says only that there are 7 pieces of background information and that the scenario evolves. It does not say whether you can return to them during the 24 situations. Because that is not published, we suggest reading them as if you could not. The list below is our advice, built on the official description of an imaginary role and changing circumstances.
| What to note as you read | Why it matters later (our reading) |
|---|---|
| Your role and who you report to | The test asks you to respond in role. An action that is right for a senior manager can be wrong for the person you are playing. |
| Who owns each decision, budget or risk | Many weak responses are someone doing another person’s job, or passing on their own. |
| Limits: amounts, approvals, deadlines, rules | A limit stated in the background can settle a situation that looks open when read by itself. |
| What the senior people say they care about | Stated priorities are the standard that responses are most naturally measured against. |
| Dates and absences | In an evolving scenario, who is available and when can change the right route for a decision. |
| What changed since the last situation | The page says the test assesses your ability to adapt to changing circumstances. A response that was right three situations ago may no longer fit. |
The reasonable adjustments page adds two facts that shape how you sit the test. Each online test is untimed, and candidates can take self-directed breaks between and during the tests. So you can stop to make notes on the background before the first situation without losing anything. Paper notes are your own preparation aid; the page does not mention them either way.
What the official pages do not publish
| Question candidates ask | Official position (read 14 October 2026) |
|---|---|
| How many of the 24 situations are most and least, and how many are ratings? | Not published. The page says “some” and “other”. |
| How many responses or actions per situation? | Not published for 2027 entry. The last campaign’s page said four responses. |
| How is it scored? Is there partial credit? | Not published. |
| What is the pass mark? | Not published. The 2027 page gives no figure and no method. |
| Does the Case Study use video? | The 2027 page says video for the Work-based scenarios and does not say for the Case Study. The last campaign’s page said each Case Study situation included some video and audio content. |
| How long does it take? | Two official statements. The online-tests page gives no length. The process video transcript on the application-process page says the tests “should take you around 1 and a half hours in total”. |
| Is there an official Case Study practice test? | None found. The only example on the Fast Stream pages is the work-based scenario. |
One more inconsistency is worth knowing so that it does not unsettle you. The online-tests page says there are 2 online tests, Work-based scenarios and the Case study assessment. The transcript of the process video on the application-process page says “The first stage consists of 2 online assessments: Using data, Work-based scenarios and Case study assessment”, which names three, and the copy of the same transcript on the assessment-centre page says “3 online assessments”. We print all three statements and do not pick one. The online-tests page was the one written for this stage, and it lists two tests.
A practice plan that uses only official material
| Material | Where it is | What to do with it |
|---|---|---|
| The four scale definitions | Online-tests page | Learn them until you can state what separates each neighbouring pair. |
| The worked example with four ratings and explanations | Example-question page, linked from the online-tests page | Rate it blind, then rank it as most and least using the tool above. |
| The Civil Service Code | GOV.UK | Read the four values. Honesty is the one the Fast Stream’s own Gen AI page cites. |
| The behaviour definitions | GOV.UK, Success Profiles: Civil Service behaviours | Read “Making effective decisions” and “Changing and improving”. Linking them to this test is our reading; the Fast Stream page names no behaviours. |
| Civil Service Judgement practice test | GOV.UK, Civil Service online tests | An official practice test for a different Civil Service test. Useful for the habit of judging actions in a work situation. It is not the Fast Stream Case Study. |
| Gen AI tools | Fast Stream Gen AI page | Allowed in preparation, including to simulate scenarios. Not allowed during the tests. |
The GOV.UK definition of “Making effective decisions” is: “Use evidence and knowledge to support accurate, expert decisions and advice. Carefully consider alternative options, implications and risks of decisions.” The definition of “Changing and improving” begins: “Seek out opportunities to create effective change and suggest innovative ideas for improvement.” The first is close to what the Case Study page calls decision-making. Neither is named on the Fast Stream page, so treat them as vocabulary for thinking about a response, not as a marking scheme.
Where our practice set fits, and where it does not
What the ProSyllabus practice set is
- A 24-situation case study with seven pieces of background information, answered as most and least effective, with the reason for both picks on every situation.
- 12 work-based scenarios with 48 actions to rate on the four-point scale, which is where the rating format is practised.
- Text only. The real Work-based scenarios use short videos.
- Independent practice material. No official answer key exists beyond the one worked example, so the keys are our reading of the published scale and the Civil Service Code.
- Free on this page: scenario 1 and Case Study situations 1 and 2.
For 2027 entry the real Case Study mixes the two answer types inside one test. Our case study is most and least only; the ratings are practised in the scenarios.
Practise it, don't just read it
Rate the four actions in a full Fast Stream scenario, free, then see the answers and the reasons for each one.
After the test: results and feedback
The online-tests page says results should be available in December 2026 and that you will be emailed when they are released. It also says you will receive feedback whether or not you are successful, and that the feedback does not indicate whether you will progress. What the feedback contains, and how to use it, is covered in our guide to Work-based scenarios tips and the feedback report. Every dated stage after the tests is set out in our 2027 application timeline.
What we could not find
Not published on any official page we read on 14 October 2026
- The split of the 24 situations between the two answer types.
- The number of responses or actions in a situation for 2027 entry.
- Any scoring method, weighting between the two tests, or pass mark.
- An official Case Study example or practice test.
- Whether you can go back to the background information, or change an answer, once a situation is submitted.
- Whether the Case Study uses video for 2027 entry.
Quoted text is from Civil Service Careers and GOV.UK, which publish under the Open Government Licence v3.0. This guide is independent and is not written or endorsed by the Civil Service.
Frequently asked questions
What is the Fast Stream Case Study assessment?
It is one of the two Fast Stream online tests. You take on an imaginary role, read 7 pieces of background information and then respond to 24 situations in one evolving scenario. The official page says it assesses your decision-making and your ability to adapt to changing circumstances.
How many questions are in the Fast Stream case study?
The official page for 2027 entry says 7 pieces of background information followed by 24 situations. It does not say how many responses or actions each situation has.
Is the case study most and least effective, or a rating scale?
Both, for 2027 entry. The official page says that in some scenarios you identify the most and least effective responses, and in others you rate several possible actions on the four-point scale from Counterproductive to Effective. It does not say how many situations use each format.
Is the Fast Stream case study timed?
No. The official page says the tests are untimed, so you can work at your own pace. You have 7 days to complete both online tests from the moment they are made available. The process video transcript says the tests should take around one and a half hours in total.
Are there official answers or a practice test for the case study?
No official Case Study example was found. Civil Service Careers publishes one worked example, for the Work-based scenarios test, with a correct rating and explanation for each of four actions. Anything sold as case study answers, including our practice set, is independent material.
What is the pass mark for the case study assessment?
It is not published. The official page for 2027 entry gives no pass mark and no scoring method. It says results should be available in December 2026.
Can I take a break during the case study?
Yes. The Fast Stream reasonable adjustments page says each of the online tests is untimed and that candidates can take self-directed breaks between and during the tests.
Can I use AI tools for the case study?
Only to prepare. The Fast Stream Gen AI page allows these tools for research and for simulating practice scenarios, and says you must not use them during your tests or assessments. It says that if use is suspected during tests or assessments, your application may be withdrawn.
Good luck from all of us
Whatever stage you are at, getting this far takes real effort, and that is worth being proud of. Prepare at a pace that works for you, check the official Civil Service Careers pages for anything that decides your application, and look after yourself along the way. We are wishing you every success.
Our doubts are traitors,
And make us lose the good we oft might win
By fearing to attempt.
More in this series
- Fast Stream online tests
- Fast Stream assessment centre (FSAC)
- Fast Stream success rates by scheme
- Fast Stream schemes and eligibility
- Fast Stream salary by year
- Fast Stream vs other routes
- Fast Stream feedback report explained
- Fast Stream 2027 application dates and timeline
- Online tests: pass mark and results
- Situational judgement test (Work-based scenarios)
- Is there a numerical test?
- Fast Stream practice test (free)
- Work-based scenarios answers and tips
- Fast Stream work style questionnaire
- Fast Stream example questions
- Fast Stream acceptance rate
- UK Fast Stream notice board — alerts and updates
Sources
- official — Civil Service Careers — Online tests
- official — Civil Service Careers — Example question: work-based scenario
- official — Civil Service Careers — Understanding the application process
- official — Civil Service Careers — Assessment centre
- official — Civil Service Careers — Fast Stream reasonable adjustments
- official — Civil Service Careers — Using Gen AI in the Fast Stream process
- official — GOV.UK — Success Profiles: Civil Service behaviours
- official — GOV.UK — Civil Service online tests (practice tests for other Civil Service tests)
- official — GOV.UK — The Civil Service Code
official = a document published by the conducting body. reported = a news or coaching site we could not check against an original. Where sources disagree this page says so rather than picking one.
