Class Anchor Charts or Plus/Delta Chart¶

Strategy · All strategies
Evidence · 4 claims (4 for) · 9 studies (4 quant-synthesis, 2 causal, 1 review, 1 associational, 1 theoretical), q2–q4 · 3 of 9 report an effect size

Description¶

After a formative assessment or test, the class discusses which problems caused concern and why. Students articulate the processes they used to attempt solutions, compare approaches, and the teacher records the agreed insights on a persistent visual artifact — an anchor chart (a reference of strategies and conventions) or a plus/delta chart (what worked "+" and what to change "Δ"). The chart remains posted as a shared reference for subsequent work.

Design Implications¶

This strategy operationalizes Assessment for Learning: assessment results become the object of collective analysis rather than a terminal grade event. Whole-class discussion of errors converts mistakes into instructional material, and requiring students to explain their reasoning promotes the self-explanation effect Self-explanation improves conceptual understanding. [+S]. Feedback delivered at the process level — how students approached problems — is more effective than feedback at the outcome level Feedback is most effective at task and process levels. [+S].

Context¶

Requirements¶

• A recently completed formative assessment with identifiable error patterns
• Protected time for structured whole-class discussion (Class Discussion)
• A visible, persistent recording surface (chart paper, whiteboard, shared document)
• A teacher facilitation stance that treats errors as informative, not shameful

Constraints¶

• Consumes significant class time; if the assessment is not already analyzed for common errors, discussion can drift or be dominated by a few voices [-M]
• Publicly identifying "problems that caused concern" can threaten students with low self-efficacy unless norms frame errors as normal and useful [~M]
• A chart that merely lists correct answers adds little; the value lies in surfacing processes, and poorly facilitated sessions can reinforce surface procedures [-W]
• Whole-class formats give weaker participants less opportunity to articulate their own reasoning than structured peer discussion [~M]

Implementation Variability¶

• Plus/Delta format: two-column chart of what helped (+) and what to change (Δ); suits post-project or post-test reflection on study habits as well as content
• Anchor chart format: teacher synthesizes discussion into a strategy reference (e.g., "When stuck on a word problem: 1. restate the question…") that persists on the wall
• Error-analysis variant: display anonymized student work and have the class diagnose the error, leveraging erroneous examples Erroneous examples build conceptual knowledge. [+M]
• Small-group variant: groups complete a plus/delta first, then report out, increasing participation before whole-class synthesis

Target Learners¶

• K–12 students, especially in mathematics, where discussing solution processes is central to conceptual development
• Students who benefit from externalizing and comparing solution strategies Self-explanation improves conceptual understanding. [+M]
• Classes developing self-regulation: the plus/delta structure prompts monitoring of one's own methods Self-monitoring improves self-regulation. [+M]

Target Learning Goals¶

• Metacognitive reflection: evaluating the effectiveness of one's own problem-solving processes
• Conceptual understanding: contrasting correct and incorrect approaches to surface underlying principles
• Classroom norms: establishing that errors are sites for learning (formative assessment culture)

Instructions¶

1. Collect and quickly scan the formative assessment for common error patterns before class.
2. Display 2–4 selected problems (or anonymized student work) without revealing grades.
3. Facilitate Class Discussion: students explain the processes they used, including where their approach broke down.
4. Contrast productive and unproductive approaches on the chart; where useful, frame an error as an Erroneous Example [+M] for the class to diagnose.
5. Co-construct the artifact: a plus/delta chart (what worked / what to change) or an anchor chart distilling agreed strategies.
6. Post the chart and explicitly reference it during subsequent Practice so it functions as a living scaffold rather than wall decoration.

Related Strategies¶

• Error analysis and erroneous-example discussion — the diagnostic variant of this routine
• Exit-ticket debriefs — a shorter-cycle version using daily formative data

Related Elements¶

• Class Discussion — the core interactional format
• Articulation — students must verbalize their reasoning for the routine to work
• Assessment — the formative data that seeds the discussion
• Coaching — the teacher's facilitation role during process talk

Patterns That Use This Strategy¶

• Formative Assessment — the debrief-and-chart step closes the feedback loop
• Discussion-Based Learning — assessment review as a structured discussion context

Examples¶

• An elementary teacher, after a math quiz on multi-digit subtraction, charts students' described methods in a plus/delta format; the class identifies "forgetting to regroup" as a delta and builds an anchor chart of regrouping steps referenced during the next unit.
• A middle-school science class reviews a formative lab-report draft, uses a plus/delta chart to separate claims from evidence, and posts the resulting anchor chart of "what a strong claim needs."

Key Sources¶

• Black, P., & Wiliam, D. (1998). Assessment and classroom learning. Assessment in Education: Principles, Policy & Practice, 5(1), 7–74. doi:10.1080/0969595980050102
• Hattie, J., & Timperley, H. (2007). The power of feedback. Review of Educational Research, 77(1), 81–112. doi:10.3102/003465430298487
• Chi, M. T. H., de Leeuw, N., Chiu, M.-H., & LaVancher, C. (1994). Eliciting self-explanations improves understanding. Cognitive Science, 18(3), 439–477. doi:10.1207/s15516709cog1803_3
• Schraw, G., Crippen, K. J., & Hartley, K. (2006). Promoting self-regulation in science education: Metacognition as part of a broader perspective on learning. Research in Science Education, 36(1–2), 111–139. doi:10.1007/s11165-005-3917-8