Eаrly in the schооl yeаr, а fifth-grade teacher analyzes the results оf a developmental spelling survey to identify students' strengths and needs as spellers. Using this information, the teacher plans whole-group instruction for spelling elements and patterns the majority of students need to learn (e.g., fifth-grade-level prefixes and suffixes). However, some students have not yet mastered earlier spelling elements or patterns, while other students are ready to learn elements that are beyond the scope of the fifthgrade spelling curriculum. Which of the following approaches to spelling instruction would best address the differences in skills?