DSS Calculator

What Is Developmental Sentence Scoring?

Developmental Sentence Scoring (DSS) is Laura Lee's (1974) weighted grammatical analysis for spontaneous child language samples. It captures the developmental level of a child's expressive syntax by awarding weighted points for the grammatical structures the child produces, then averaging across 50 consecutive complete sentences. DSS is one of the oldest and most widely cited language sample analysis (LSA) procedures and remains a benchmark for syntactic complexity.

The Eight DSS Categories

Lee (1974) defined eight grammatical categories. Each category contains a list of forms with weights from 1 (earliest acquired) to 8 (latest acquired). Score every instance you find in each sentence:

• Indefinite Pronouns — it, this, that (1); no, some, more, all, lot(s), one, two… (3); something, somebody, someone (4); each, every, anybody, anyone, everybody, everyone, anything, everything (7).
• Personal Pronouns — I, me, my, mine, you, your(s) (1); he, him, his, she, her, hers (2); we, us, our(s), they, them, their(s) (3); reflexives (5).
• Main Verbs — uninflected verb / copula is/am (1); -s, -ed, irregular past, copula are/was/were (2); can/will/may + verb (4); could/would/should/might + verb (6); have/has/had + been + -ing (7); modal + have + past participle (8).
• Secondary Verbs — five complement infinitives, gonna/wanna/gotta (2); non-complementing infinitives (3); participles (4); early infinitival complements (5); passive infinitive (7); gerunds (8).
• Negatives — it, this, that + copula + not (1); can't, don't (4); isn't, won't (5); all other negatives (7).
• Conjunctions — and (3); but (5); or, if, so, because (6); when, while, until, before, after, since, though, unless, although (8).
• Interrogative Reversals — reversal of copula (4); reversal of auxiliary be (6); obligatory do/does/did (6); reversal of modal (6); tag question (8).
• Wh-Questions — who, what, what + noun (2); where, how many, how much, what… do (4); when, how, how + adjective (5); why, what if, how come (7); whose, which, which + noun (8).

Lee (1974) provides a 100+ page scoring manual; this tool implements the canonical structural list as a tappable scoring grid.

The Sentence Point Rule

Each sentence in the 50-sentence sample can earn one extra point — the sentence point — but only if the entire sentence is grammatically and semantically correct. The sentence point checks the bits that the eight category lists do not cover: articles, plurals, agreement, word order, tense consistency, and lexical accuracy.

Score the sentence point conservatively. If you are unsure whether a sentence is fully correct, mark it incorrect. Tap the SP toggle on each row to add or remove the point; the calculator updates the running DSS live.

How This Calculator Works

Type or paste your 50 sentences into the textarea (one per line) and the calculator renders a scoring grid with one row per sentence and one column per DSS category, plus a Sentence Point (SP) column. For each sentence:

• Tap the + button under each category that appears in the sentence and select the weight (1, 2, 3, 4, 5, 6, 7, or 8). Points stack — a sentence with a 1-weight pronoun and a 4-weight modal verb earns 5 from those two categories.
• Tap SP to award the sentence point.
• The running totals at the top show the per-category subtotal, the total points, the scored-sentence count, and the live DSS value.
• At 50 scored sentences (the Lee minimum) the calculator removes the "below minimum" warning.

Tap a category cell again to clear it; tap SP again to remove the sentence point. Nothing is uploaded — every value lives in the page state and disappears when you close the tab.