Clarity matters less as concept structure becomes simpler: no significant clear-vs-unclear difference for constant successive lessons¶

Claim · All claims
Evidence · 1 study · causal r2 · q3
Currency · newest study 1991 · not yet checked against its sources · not reviewed by a person
Evidence quality · No study behind this claim is a peer-reviewed article with a DOI: it rests on an ERIC document (a report, conference paper or thesis). It is kept because 2 design pages cite it; treat it as a lead to check, not an established finding.

Subclaims¶

q3 i? For the constant successive structure, clear and unclear lessons showed no statistically significant achievement difference on any measure. → Snyder 1991

Evidence¶

Snyder 1991¶

Snyder, Stephen; Bushur, Lori; Hoeksema, Pam; Olson, Mark; Clark, Shawn; Snyder, Jill. (1991). The Effect of Instructional Clarity and Concept Structure on Student Achievement and Perception. https://eric.ed.gov/?id=ED331809

q3 · i? · causal · r2

Simple main effects tests in the Results section comparing clear vs. unclear constant successive lessons. The article reports clear lessons descriptively better on all measures but no statistically significant difference; equivalence was not tested.

"The clarity of a lesson presentation does not seem to be a significant variable affecting student achievement when a constant successive concept structure is given.Even though students receiving the clear lesson for the constant successive concept structure did better than the unclear lesson on all the dependent measures, there was no statistically significant difference found."

Discussion¶

Related Claims¶

• Students accurately perceive differences between clear and unclear lessons regardless of concept structure — related
• A clear variable coordinate lesson produced higher achievement than an unclear lesson with the same concept structure on all five measures — related
• Instructional clarity is a significant main effect on concept achievement, accounting for roughly half of score variance across measures — the same study's overall main effect of clarity, which this finding qualifies
• Clarity and concept structure interact for defining and applying concepts, each accounting for about 40-44% of variance — related
• Under unclear presentation, a more complex concept structure lessens students' ability to identify concepts
• Simpler knowledge components are executed faster: correct application times rise from about 3-6 seconds for constant-constant KCs to 10-14 seconds for variable-variable KCs