Repertory Grading Scales and Hierarchy: How Symptom Grades Are Structured

What a Repertory Grade Actually Records

A repertory is an index of symptoms, each symptom listed as a rubric with the medicines historically associated with it. A grade is a value attached to one medicine inside one rubric. It is not a measure of how well a medicine worked, and it is not a dose, a potency, or a strength of preparation. It is a compact editorial judgement about how strongly that medicine has been linked to that particular symptom in the source literature the compiler drew on.

That distinction matters because grades are frequently read as if they were evidence ratings. They are closer to a librarian's classification than to a trial result. A high grade usually means the symptom appeared prominently and repeatedly in the provings and clinical records available to the compiler, or that a well-regarded author emphasised it. A low grade often means the symptom was mentioned once, mentioned in passing, or recorded by a single observer.

Because grading conventions differ between repertories, a grade only carries meaning inside the book or database that produced it. Comparing a grade in one repertory with a grade in another is unreliable unless you know how each compiler defined the levels and what sources each one used. The hierarchy is internal to the work.

The Conventional Three-Tier Structure

Most modern repertories use three levels, usually printed as plain, italic, and bold type, or as small numbers such as 1, 2 and 3. The mapping between typography and number varies by edition, so the first practical step is to read the legend at the front of the specific repertory you are using rather than assuming a standard.

The general logic runs as follows. A first-degree entry is a weaker association: the medicine is listed, but the link is thin. A second-degree entry is a moderate, reasonably consistent association. A third-degree entry is the strongest association the compiler was willing to record for that symptom. Some repertories add a fourth tier, and a few use superscripts or symbols for remedies the compiler considered especially characteristic of the rubric.

The practical consequence is that grades are ordinal, not proportional. The gap between first and second degree is not the same size as the gap between second and third, and you cannot add grades together as if they were points on a scale. A medicine with three second-degree rubrics is not equivalent to one with two third-degree rubrics, even though a naive sum might suggest otherwise.

Why the Hierarchy Is Not the Same as Clinical Importance

A common error is to treat the highest-graded rubric in a case as the most important symptom. The hierarchy ranks medicines within a rubric; it does not rank symptoms within a patient. A striking, unusual, highly individual symptom may sit in a rubric containing only a handful of low-graded medicines, and that rubric can still be the most decisive part of the case.

Grading hierarchy and case hierarchy are two separate structures that meet during repertorization. Case hierarchy is about which symptoms are most characteristic of this particular person. Repertory hierarchy is about how strongly the literature links medicines to a symptom. Good practice keeps them distinct and then looks at where they intersect.

This is why an experienced prescriber will often repertorize a small number of well-chosen rubrics rather than a long list of high-grade ones. A short list of characteristic symptoms, even with modest grades, tends to discriminate between medicines more sharply than a long list of common symptoms where many medicines score highly.

A Practical Checklist for Reading Grades Correctly

The following checks are worth running through whenever you take a repertorization result seriously. Each one addresses a specific way the grading hierarchy can mislead if read casually.

The rationale column matters more than the check itself. Most errors in repertorization come not from arithmetic but from misreading what a grade represents, or from letting the software's ranking substitute for judgement about the case.

• Read the legend first — because typography and numbering conventions differ between repertories, and a bold entry in one edition may correspond to a different level in another.
• Confirm which repertory and edition you are using — because rubrics are added, split and re-graded between editions, so a result is only reproducible if the source is named.
• Check whether the rubric is general or particular — because a general rubric and a specific one covering the same complaint behave differently in analysis, and mixing them inflates scores.
• Note how many medicines the rubric contains — because a third-degree entry in a rubric of six medicines means something different from the same grade in a rubric of six hundred.
• Separate characteristic symptoms from common ones — because common symptoms produce high-grade matches across many medicines and contribute little discrimination.
• Look at the whole row, not just the top score — because a medicine that appears repeatedly at second degree across several rubrics may be more coherent than one that tops a single rubric.
• Re-check the source materia medica for the leading medicine — because the grade tells you the compiler's view, not the underlying record, and the original account may be thinner or richer than the grade implies.
• Record your reasoning alongside the result — because a repertorization you cannot reconstruct later is difficult to learn from or to revise.

How Repertorization Software Alters the Picture

Digital repertories make the hierarchy visible in ways print cannot. They can sum grades, weight rubrics, filter by remedy, and rank results instantly. The convenience is real, but the arithmetic introduces assumptions that the printed page left implicit.

When software adds grades across rubrics, it treats the levels as if they were evenly spaced numbers. As noted earlier, they are not. A result ranked first by total score may be ranked lower if you weight characteristic rubrics more heavily or exclude rubrics that are too general to discriminate. Many programs allow this kind of reweighting, and knowing which settings produced a result is essential to interpreting it.

Software also tends to flatten the distinction between a rubric that is well attested and one that is merely large. A large rubric will often produce high totals for common medicines simply because it contains many entries. Filtering by rubric size, or by how many of your chosen rubrics a medicine appears in, is usually more informative than the raw total.

Limits of Grading as a Guide

Grades are compiled from historical sources of uneven quality. Provings conducted in different eras used different protocols and different standards of recording. Clinical confirmations were often single cases reported by the practitioner who prescribed. A compiler working through this material has to make judgement calls, and those calls are embedded in the grades you read.

Different compilers also made different choices about inclusion. One may have been generous, listing a medicine wherever any source mentioned it. Another may have been conservative, listing only where several sources agreed. The same underlying literature can therefore produce visibly different grade distributions in two repertories.

For a reader trying to understand the hierarchy, the honest position is that grades are a structured index to a body of literature, useful for narrowing possibilities and for organising a case, but not a measurement of therapeutic effect. They should be read alongside the materia medica and alongside a careful assessment of the individual case, and any decision about treatment belongs with a qualified practitioner.