What Tense Should a Case Study Use?

The core rule and its two exceptions

Everything that happened in the case is past tense, without exception: presented, administered, deteriorated, resolved, was referred. The case study is a historical document about events that have finished occurring, and past tense is what makes the narration read as analysis of completed events rather than a live broadcast. The discipline matters most in the description section, where drafts drift — one paragraph narrates in the past, the next slips into the present because the writer is re-visualizing the chart. Pick the past and hold it; the drift is the tell of unedited drafting.

The two exceptions are exact. Present tense for what sources say: Smith (2021) reports, the dataset indicates, the literature shows — the APA convention that authors' claims live in the perpetual present of the text. And present tense for standing truths: diabetes is a chronic condition, the drug acts on the nervous system, turnover costs organizations roughly one salary. Neither exception covers narrating the case, which is where students over-apply them. If the sentence's subject is your case — its patient, its firm, its school — the verb is past; if the subject is a source or a general truth, present.

The numbers at a glance

Tense by section in a standard case study — the range, and where each row actually shows up in coursework. Skim it first; the sections below explain why the range exists and which row applies to you.

Section by section: where the tenses actually land

The background section is all past, and its dates do the anchoring: the company was founded in 1998, the crisis began in the second quarter. Description sections continue the past — interventions, responses, turning points — with sequence markers doing the ordering work the tense cannot. The literature-connection section switches: each source speaks in the present (Garcia (2022) finds), while the case facts inside those sentences stay past (Garcia (2022) finds that delayed referrals worsened outcomes in similar cases). Every sentence that mixes sources and case facts contains both tenses by design.

The analysis section is the mixing zone, and the seam discipline is what graders check. Analysis of the case is past: the delay explained the relapse, the staffing cut preceded the error cluster. Claims drawn from the case for the field are present: this pattern suggests that, the case illustrates how. The rhythm is a past-tense observation followed by a present-tense implication — that is the sound of analysis working. Recommendations then shift fully to the present-future world of proposals: the unit should adopt, the protocol will reduce. A recommendation in past tense (the program included training) is describing, not recommending.

The literature-review overlap trap

Course case studies usually require connecting the case to published literature, and that is where tense conventions collide — the case says was, the sources say says. The sentence pattern that handles both: source in present, case in past, in that order. Rivera (2023) identifies staffing ratio as the strongest predictor of medication errors; Riverside General's ratio fell below that threshold in all four quarters preceding the incident cluster. The order matters psychologically: leading with the source sets the present-tense frame, and the case fact lands as the instance of the pattern.

The trap is the passive-aggressive hybrid some drafts produce — the literature has shown that staffing was — where the tense sequence has no logic and each edit introduces a new drift. Decide the pattern once, in your notes, and apply it mechanically: present for every source verb, past for every case verb, regardless of sentence position. The only variation worth adding is the reporting-verb register: argues for contested claims, found for completed studies where the past is the point (the trial found a 14% effect), reports for neutral summary. Tense carries the timeline; verb choice carries your confidence.

The three drift patterns and their fixes

Three drifts account for nearly every tense flag. The historical-present drift: the patient presents with chest pain — newsroom tense applied to a case that concluded two years ago; fix by narrating the whole description in past. Eternal-present drift: the company struggles with turnover — true in the case's window but written as if ongoing now; fix by dating the window in the background and binding narration to it (during the study period, the company struggled). The analysis drift: the evidence suggests the delay caused the relapse written as the delay causes relapse, which overclaims a single case into a law.

The mechanical fix for all three is the same pass: read the description section alone and mark every verb; anything not past gets dated or converted. Then read the analysis and check the pattern — past observation, present implication, past observation, present implication. Ten minutes. The pass also catches the reverse error students make after tense training: converting recommendations into past tense out of overcorrection. Recommendations are proposals; they live in should and will. A case study with clean past narration, present-tense sources, and future-leaning recommendations reads as handled.

Discipline conventions that override the defaults

Fields adjust the baseline, and the syllabus style sheet wins ties. Business case analyses often write the case itself in past but keep framework applications (a SWOT reveals) in present, because the framework is a standing lens. Nursing and medicine follow the AMA convention: published case reports narrate in past with sources in present, matching the APA pattern. Psychology case studies follow APA fully. Law-adjacent case briefs invert everything — the case is discussed in present (the court holds) because the decision speaks perpetually. Know which genre your assignment belongs to before applying any table.

When the assignment sheet is silent, the safe default is the table above: past case, present sources, present-future recommendations, past-with-present-implications analysis. It matches the majority convention across business, health sciences and social science, which is where most course case studies live, and it keeps the narrator's relationship to the events consistent from section to section. The one convention to never import casually is the legal present — the court holds belongs in briefs, not in a nursing case study, and its appearance signals genre confusion to graders in every other field.

The format check graders run before reading

Graders check mechanics first and content second — a two-minute scan that decides the paper's first impression. The list: correct font and size, double spacing throughout (no stray single-spaced paragraphs), one-inch margins, page numbers in the right corner, the required title-page fields, heading levels used consistently, and references formatted with hanging indents. Each item is trivial; missing two costs measurable points in most rubrics.

Do this scan on the exported PDF, not the working document — export quirks (shifted margins, dropped page numbers, orphaned headings) only appear there. The style switcher below shows the same source formatted in APA 7, MLA 9 and Chicago side by side, which is the fastest way to catch the format you've been half-remembering from the wrong course.