Second-Grade Digraph and R-Controlled Vowel Error Pattern
Mr. Boone reviews a spelling inventory and running records for his second-grade class. Priya reads grade-level CVC words with 95% accuracy and reads ship correctly, but on a digraph and r-controlled list she reads chop as /k/ /o/ /p/, thin as /t/ /h/ /i/ /n/, and star with a short /a/. Her spelling shows ship as sip, chop as cop, thorn as torn, and girl as gril. She knows all single letter names and sounds and can blend three sounds. The class begins a multisyllabic-word unit next week. Priya receives a 20-minute intervention block three times weekly. Mr. Boone wonders whether to keep her in the grade-level unit, move her to the intervention group for digraphs, or do both. He has decodable texts, letter tiles, and a word-building routine.
1. Analyze Priya's errors to identify the dominant phonics pattern and explain why the errors are not random. Use specific examples from the setup.
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Priya's errors are systematic, not random. She reads chop as /k/ /o/ /p/ and thin as /t/ /h/ /i/ /n/, which means she is treating each letter as a separate sound and has not learned that two letters can map to one phoneme. Her spelling 'sip' for ship and 'cop' for chop shows the same missing digraph representation. Star with a short /a/ and 'torn' for thorn and 'gril' for girl suggest r-controlled vowels are also unstable, though the digraph errors are the clearer pattern. Her strong CVC reading and letter-sound knowledge rule out a broad alphabetic-principle problem. The dominant need is consonant digraphs (sh, ch, th), with r-controlled vowels as a secondary target. This matters because the upcoming multisyllabic unit will load more digraphs and vowel patterns; without these, she will guess or omit sounds.
2. Recommend a placement decision and a three-week word-work plan. Justify why you would or would not move Priya entirely out of the grade-level unit.
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Keep Priya in the grade-level unit for read-aloud, discussion, and comprehension, but provide Tier 2 intervention three times weekly for 20 minutes instead of moving her entirely out. Three-week sequence: Week 1-sh and ch: word building with letter tiles (ship, shop, chip, chop), sorting by sound, reading decodable phrases, and spelling dictation with immediate feedback. Week 2-th plus review of sh and ch: thin, thick, bath, moth; contrast /th/ with /t/ using minimal pairs. Week 3-r-controlled ar and or: star, car, fork, storm; then er, ir, and ur if ready. Each session: three minutes review, seven minutes explicit modeling and word building, five minutes decodable text application, and five minutes spelling with error correction. Do not drop comprehension instruction; use grade-level texts read aloud. The grade-level multisyllabic unit can include her as a listener and participant, but her independent word work should stay at the digraph and r-controlled level until she is accurate.
3. Describe how you would monitor Priya's progress and decide when she is ready for multisyllabic words. What criterion would you use, and why not wait for 100% accuracy?
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Monitor with a weekly 10-word reading probe and a five-word spelling dictation that mix taught patterns with review words. A reasonable criterion to add two-syllable words is 90% accuracy on the mixed word-reading probe and 80% on spelling for two consecutive weeks. Also check transfer: she should read a short decodable passage containing digraphs at 95% accuracy. If she meets the criterion, introduce two-syllable words with closed syllables and known digraphs, such as sunset and shipment, then r-controlled syllables. If not, reteach the error pattern rather than simply repeating the same list. The decision is based on pattern accuracy plus transfer, not on completion of the three weeks. Waiting for 100% would delay access to grade-level content and is unnecessary; the goal is reliable, flexible decoding.