ReasoningCampus · Online SHL preparation
SHL Deductive Reasoning Scheduling: Our Method and 6 Questions
A calendar question can look busy before you have done any reasoning at all: several people, overlapping appointments and a meeting that must fit somewhere. SHL deductive reasoning scheduling becomes easier when you turn that picture into a few precise conditions. ReasoningCampus offers online SHL preparation, and this lesson teaches our interval method with a worked timetable, a checker and six fully explained questions.
Deductive reasoning means finding what follows from given rules. In a scheduling problem, those rules concern time, order or availability. You are not being asked to invent a convenient timetable; you are checking which arrangements the supplied information allows. We begin without time pressure so that you can see why a slot works before trying to find it quickly.
View full preparationUnderstand scheduling questions before working against the clock
SHL describes deductive reasoning in terms of drawing logical conclusions from supplied information. Calendar and ordering exercises are the focus of this ReasoningCampus lesson; they are not a promise that every assigned SHL test contains this exact screen or question mix.
| Problem | How to begin | Common trap |
|---|---|---|
| Shared availability | Find the latest start and earliest finish within each candidate window. | Checking one person or only the start time. |
| Duration and buffers | Reserve the meeting plus every stated preparation or travel interval. | Fitting the meeting but leaving no required buffer. |
| Ordering tasks | Turn “immediately after” into a fixed block; keep “before” as an order constraint. | Treating “before” as “immediately before”. |
| Must, could or cannot | Decide whether you need a proof, one valid example or an impossibility. | Calling a possible schedule compulsory. |
For a shared window, write available length = earliest finish − latest start. A meeting of length d fits only if its full occupied interval fits. If the question supplies no buffer, do not invent one. If it supplies a 15-minute buffer, include it every time. The worked example below makes these boundaries visible.
SHL deductive reasoning scheduling: the ReasoningCampus method
Our teaching routine is record, intersect, reserve, verify and review. Translate each condition into a time interval or an ordering rule. Keep a short working record with four entries: participants, common window, occupied interval and final rule check. This makes the cause of a wrong answer visible. A start time alone hides whether you checked the meeting length or the buffer.
Begin with the required result: a start time, a complete arrangement or a statement that must be true. These require different kinds of proof. Finding one available slot answers a “could” question; it does not prove that no other slot works.
- Fix the time unit. If a grid uses 15-minute blocks, a 45-minute meeting occupies three consecutive blocks. Do not count boundary lines as blocks.
- Write every condition. Include participants, room availability, duration, task order and any stated travel or setup time.
- Find the overlap. For one candidate window, take the latest start and earliest finish across everyone involved.
- Fit the whole activity. A person must be free for the entire meeting, not only at its starting minute.
- Verify the complete result. Recheck each rule against your selected start and finish. If the question asks for every possible start, continue after finding the first.
Boundary rule used in this lesson: an activity occupies its start time up to, but not including, its finish. A booking ending at 10:00 does not overlap one starting at 10:00. Add a gap only when the question requires one.
Words that change the arrangement
| Wording | What it requires | What it does not establish |
|---|---|---|
| B after A | A finishes before or when B starts. | That B is immediately next. |
| B immediately after A | B starts when A finishes, with no gap. | That A starts at the beginning of the day. |
| At least 15 minutes between A and B | The gap is 15 minutes or longer. | That the gap must be exactly 15 minutes. |
| One hour continuously | An uninterrupted 60-minute interval. | That two separate half-hours can be combined. |
Calendar reasoning: show the occupied interval
For the worked example below, write “shared window 09:30–10:00; meeting 09:30–09:45; handover 09:45–10:00”. That record supports a 15-minute meeting with a 15-minute handover. If you write a 30-minute meeting instead, the added handover ends at 10:15 and the plan fails. This is how we teach you to catch an attractive start time that does not support the whole task.
Worked calendar: find the overlap before choosing a time
All times use the same clock. The listed intervals are the complete availability within 09:00–12:00. Meetings start on quarter-hour boundaries. There is no travel or setup time unless a question adds it.
| Person | First available interval | Second available interval |
|---|---|---|
| Ada | 09:00–10:30 | 11:00–12:00 |
| Ben | 09:30–11:00 | 11:30–12:00 |
| Cam | 09:00–10:00 | 10:45–12:00 |
Step 1: check the morning overlap
The latest first start is 09:30. The earliest first finish is 10:00. Everyone can therefore attend throughout 09:30–10:00. A 30-minute meeting fits; a 45-minute meeting does not.
Step 2: continue after the first answer
After 10:00, Cam is unavailable until 10:45. At 10:45, Ada is unavailable until 11:00. At 11:00, Ben is unavailable until 11:30. The next shared window is 11:30–12:00. These are the only shared windows in the displayed period.
Step 3: change one condition
Suppose all three people must remain free for a 15-minute handover immediately after the meeting. A 30-minute meeting now needs a 45-minute shared window. Neither window is long enough. A 15-minute meeting plus its 15-minute handover fits at 09:30 or 11:30.
What this teaches: solve the availability problem first, then apply the required duration. Do not silently stretch a short overlap into a longer meeting.
An ordering question needs a different final check
Place P, Q, R and S into four consecutive slots, once each. Q is immediately after P; R is before P; S is not last. The P–Q block cannot start in slot 1 because R needs an earlier slot. It cannot start in slot 2 because S would have to be last. It must occupy slots 3–4. The two valid orders are R, S, P, Q and S, R, P, Q.
Q is last in both orders, so that conclusion is necessary. R is first in only one order, so it is possible but not necessary. Keep both arrangements until the question tells you which kind of conclusion it needs.
Try the calendar checker
Use the availability table above. The buffer is after the meeting and reserves all three people. This checker evaluates one proposed slot; it does not simulate an SHL assessment.
SHL deductive reasoning scheduling: six explained practice questions
Try all six questions before opening the worked answers below. Submit your choices to see your score and individual feedback. You can change your choices before submission, or go straight to the answers and explanations for self-study.
This is an original ReasoningCampus learning check. One point is awarded per correct answer. The total is not an SHL score, a percentile, a pass prediction or a personality profile.
Answers and complete worked explanations
Open any question below to study the correct answer, the alternatives, the method and the common trap. These explanations are available without completing the quiz.
Review the reasoning in any missed or uncertain answer. The score describes this small set only.
Question 1: Earliest shared half-hour
Correct answer: C. 09:30
Start by finding a period when all three people are free, rather than testing a convenient-looking time. Ada can begin at 09:00, Ben at 09:30 and Cam at 09:00, so the shared period cannot begin before the latest of those times: 09:30. Its end is the earliest finish, 10:00. That leaves exactly 30 uninterrupted minutes, so C works.
At 09:00 (A), Ben would miss the entire first half-hour. At 09:15 (B), he would miss its first 15 minutes. Starting at 10:45 (D) does not help: Ada is unavailable until 11:00 and Ben’s first available period ends at 11:00. Write the complete interval, 09:30–10:00, beside your answer. Checking only the starting minute is how otherwise careful candidates miss a clash.
Question 2: A longer meeting
Correct answer: B. No, neither common window is long enough
The useful quantity here is the length of each shared window. From the worked table, the only common windows are 09:30–10:00 and 11:30–12:00. Each lasts 30 minutes. A continuous 45-minute meeting needs one window of at least 45 minutes; two separated half-hours cannot be joined into a continuous meeting. B is therefore the answer.
A would reserve 09:30–10:15, but Cam stops being available at 10:00. C fails because Ada is unavailable at 10:45 and Ben becomes unavailable at 11:00. D would finish at 12:15, beyond the supplied availability. Notice that finding enough free minutes in total is a different problem from finding enough consecutive free minutes.
Question 3: Touching endpoints
Correct answer: A. 09:30–10:00
Treat the free period as an interval with a clear finishing boundary. A meeting is allowed if its start is at or after 09:00 and its finish is at or before 10:00. The meeting in A begins at 09:30 and ends exactly at 10:00, so all of it fits. Under the convention stated in this lesson, finishing at the next booking’s start does not create an overlap.
B and D both continue until 10:15, putting 15 minutes inside the busy period. C starts at 10:00, when that busy period begins, so none of its half-hour is free. Do not add an unstated preparation gap: a buffer would matter only if the question supplied one.
Question 4: A necessary position
Correct answer: D. Q is last
Join P and Q into the fixed block P–Q because “immediately after” leaves no gap. There are only three possible starting positions for that block. It cannot start in position 1 because R must come before P. If it starts in position 2, R must be first and S must be fourth, contradicting “S is not last”. The block must therefore occupy positions 3 and 4.
The remaining positions can be R,S or S,R. In both arrangements Q is fourth, so D is necessary. A and B describe just one arrangement: S,R,P,Q disproves both “R is first” and “S is second”. C is impossible because placing P second forces the forbidden final position for S. For a “must” question, keep alternatives until you have established what they share.
Question 5: A buffer uses availability too
Correct answer: B. 15-minute meeting at 09:30
The buffer reserves the same people as the meeting, so add it to the duration before checking availability. B needs 15 + 15 = 30 minutes: meeting 09:30–09:45, then handover 09:45–10:00. This exactly fills the common window without extending beyond it.
A needs 45 minutes from 09:30, finishing at 10:15 when Cam is unavailable. C also needs 45 minutes, finishing at 12:15 beyond the displayed period. D reserves 09:45–10:15: although the meeting itself ends at 10:00, the handover does not. A helpful working line is “start + meeting + buffer = release time”. Use that release time, rather than the meeting’s finish, for your final check.
Question 6: Travel between locations
Correct answer: C. 10:35
The first meeting releases you at 10:15. Travel starts then and takes 20 minutes, so the arrival time is 10:15 + 00:20 = 10:35. With no other constraints, a meeting can begin as soon as you arrive. C is the earliest possible start.
A allows only five minutes of travel and B only 15, so neither satisfies the journey time. D gives you enough time, but it adds an unnecessary ten-minute wait after arrival. The question asks for the earliest possible time, not merely a time that could work. Unlike the earlier calendar exercise, this question does not impose quarter-hour starting boundaries, so rounding 10:35 up to 10:45 would introduce a rule that was never given.
SHL deductive reasoning preparation at ReasoningCampus
ReasoningCampus provides online SHL preparation in deductive reasoning, including work on schedules, ordering and logical restrictions. This free lesson demonstrates the checking routine. Use the linked preparation page to see the current study materials, theory and answer explanations before choosing your next practice set.
Choose your next practice step
- You missed a person or a buffer. Redo the calendar example and record the complete occupied interval before using the checker.
- You found one valid answer but the question asked what must follow. Continue to the deductive reasoning lesson and practise finding a counterexample.
- You can explain each decision without looking at the key. Try a fresh scheduling question, then review accuracy and time separately. Follow your invitation for assessment timing.
Explore the ReasoningCampus SHL preparation materials and choose the areas named in your assessment invitation.
SHL deductive reasoning scheduling: practical FAQs
Should I draw every possible calendar?
First mark fixed commitments and find common windows. Enumerate alternatives when the question requires all possible starts or a necessary conclusion; do not redraw the whole day after every clue.
Can a meeting start when another one finishes?
In these exercises, yes, unless a gap is stated. For your assessment, read the wording and any legend. Never add an unstated travel or setup restriction.
How do I avoid missing an “immediately” rule?
Join the two tasks into a single block before positioning them. Keep the order inside the block fixed and check any rule applying to either task.
Is this a full SHL deductive mock test?
No. This is a focused ReasoningCampus lesson and six-question practice check. It teaches scheduling decisions rather than reproducing the proprietary interface, timing or scoring.
What should I write down after a wrong answer?
Name the exact rule you missed: a participant, a boundary, continuity, a buffer or the difference between possible and necessary. Then solve a new case with that condition changed.
How does ReasoningCampus help beyond this lesson?
Our SHL preparation includes deductive practice with worked explanations. Use the full preparation page to check the current coverage and choose material matching your invitation.
Official sources and how this lesson was prepared
The SHL references below provide the assessment context. The teaching method, fictional examples, diagrams, tools and explained practice answers are ReasoningCampus learning material; they are not official SHL questions or scoring rules.
- SHL Verify Interactive – Deductive Reasoning fact sheet
- SHL candidate support: practice answers and feedback
AI assistance was used in research, drafting and implementation. Calculations, logic and the page tools were checked during preparation. These lessons are independent educational material; the methods are not SHL scoring rules. Read about ReasoningCampus or send a correction or question.
