The working memory limits every plan should respect
Externalise important steps and decisions. Do not treat a research estimate of memory capacity as a fixed limit on human capability.
The performance question
A plan that relies on remembering several changing dependencies is fragile under interruption. Make the next action, ownership and exception conditions accessible at the point of work. This protects delivery without labelling people as poor at remembering.
What the evidence supports
Cowan’s research synthesis discusses a capacity around four chunks under carefully defined conditions. It distinguishes these conditions from situations using rehearsal and existing knowledge. It is not a rule that every employee can hold only four business tasks.[1]
A practical approach
For a complex recurring process, provide a concise checklist and a visible record of outstanding actions. Group related information meaningfully and keep authoritative instructions in one place. Test the process with a colleague who does not know it by heart. Retain specialist verification for steps with material safety or legal consequences.
How to review progress
Review omissions, duplicate work and ambiguity about the next step. Ask whether the checklist is short enough to use but complete enough to be safe. Do not use memory capacity research to justify an arbitrary limit of four priorities in every role.
Sources and references
- Capacity limits in short term memory Opens in a new tab
Nelson Cowan, Behavioral and Brain Sciences, 2001
Research synthesis: abstract and boundary conditions for chunk capacity