🔍 Historical investigations in class: working on critical thinking with Parlova

A lesson on the assassination of Julius Caesar can last fifty minutes and leave no trace. An investigation into the same events — where students question Brutus, Calpurnia, and Cicero to reconstruct what happened on the Ides of March — is memorable. Not because it is more fun, but because it activates different cognitive mechanisms: confronting contradictory sources, methodical doubt, and the argued reconstruction of an event.

Why the investigation engages differently

The lecture transmits certainties. The investigation, however, begins with an uncertainty — "Who killed Caesar, and why?" — and requires students to seek the answer. This shift in the learner's status is not cosmetic: it activates procedural memory (how I search) in addition to declarative memory (what I know). Research in cognitive science shows that problem-based learning produces more durable memory traces than passive reception.

The investigation also introduces something that the lecture does not easily reproduce: contradiction. The suspects have incompatible testimonies. Brutus says one thing, Cicero says another. The student must evaluate the credibility of each source, detect biases, and construct a coherent reconstruction. This is exactly what historians do — and precisely what the curriculum requires to be taught.

What happens during a Parlova investigation

A Parlova investigation operates in three stages. First, the teacher creates a mission with a scenario: an uncertain historical event and several characters linked to it. Each character knows part of the truth, has their own motivations, and can — intentionally or not — mislead the students.

Next, the students question the suspects in real time. The characters respond from their point of view and their era. A Roman senator will not directly say "Brutus organized the plot" — he will say "Brutus is an honorable man" in a tone that students learn to read between the lines.

The skills developed

• →Source criticism — evaluating the reliability of a testimony according to the position and interests of the witness
• →Inductive reasoning — constructing a hypothesis from several partial clues
• →Written expression — writing an argued investigation report with cited evidence
• →Oral debate — confronting reconstructions from different groups and defending a thesis
• →Historical empathy — understanding why an actor acted according to their own logic

Structure of a 45-minute investigation session

1. 15 min — Contextualization: the teacher presents the event to be solved and the available suspects.
2. 225 min — Interrogations: students (alone or in pairs) question 2 to 3 suspects and note the testimonies.
3. 310 min — Synthesis: each group writes a hypothesis of one or two sentences and explains it to the class.
4. 45 min — Revelation and assessment: the teacher presents the historian's reconstruction, discusses the differences with the students' hypotheses.

Links with the official curriculum

The skills developed in an investigation — source criticism, constructing an argument from partial traces, reconstructing events — are explicitly in the middle and high school history curriculum. The Common Core mentions the "scientific approach" and "critical judgment formation" as cross-disciplinary objectives. The historical investigation is its concrete application.

Parlova allows for the creation of personalized investigations adapted to the class level. The missions can be calibrated in difficulty and include a dashboard to track each student's conversations in real time.