Interaction Quality

Interaction Cost

The effort users spend to complete an interaction, including steps, decisions, attention, memory, movement, waiting, and recovery.

Concept facts

Interaction cost is the effort a user must expend to complete a task or obtain value from a system, including physical, cognitive, temporal, and navigational effort.

Also known as
Interaction effort, user effort, task effort, cost of interaction
Used in
Workflow evaluation, navigation review, form usability, dashboard design, transaction flows, service journey evaluation
Interpret with
Efficiency, cognitive load, time on task, error recovery, task success, accessibility, user context, and task value

Plain-language explanation

Interaction cost describes what the user must spend to get something done. This may include reading, deciding, clicking, scrolling, searching, remembering, waiting, moving between pages, recovering from errors, or asking for help.

A system may technically support a task but still impose high interaction cost. Users may complete the task only after unnecessary effort, repeated checking, or avoidable navigation.

Interaction cost is not always bad. Some tasks require careful attention. The issue is whether the effort is necessary, proportionate, and understandable for the task.

Why it matters

High interaction cost can reduce task completion, increase errors, slow users down, and make services harder for people with limited time, stress, low digital confidence, accessibility needs, or unfamiliarity with the domain.

In institutional and public-service journeys, high interaction cost may appear as repeated visits, staff assistance, incomplete submissions, duplicate records, or abandonment.

Interaction cost helps teams examine friction beyond single metrics. A task may be successful but still require too much effort to be sustainable or fair.

Use contexts

  • Workflow and task evaluation
  • Navigation and information architecture review
  • Form and transaction review
  • Dashboard and administrative tools
  • Search and browse journeys
  • Service journey evaluation
  • Accessibility and inclusive design review

Application guidance

Identify the actions, decisions, waits, memory demands, navigation steps, and recovery work required to complete a task. Then ask which costs are necessary and which are created by design, content, structure, or system constraints.

Use interaction cost with other evidence. A high number of steps may be acceptable if each step is clear and necessary. A short flow may still have high cost if users must make difficult decisions without enough information.

When reducing interaction cost, do not remove guidance, confirmation, or safeguards that users need for accurate decisions.

Practical example

A small business owner applying for digital lending must check eligibility, prepare trade license information, provide transaction history, upload bank documents, verify mobile number, and review repayment terms across several disconnected screens.

The task is possible, but the interaction cost is high. The user must remember information across screens, recover from timeouts, and interpret financial terms without enough contextual support.

Interpretive boundaries

  • Interaction cost is not only number of clicks.
  • Lower interaction cost is not always better if it removes necessary understanding or safeguards.
  • Some effort comes from domain complexity rather than interface design.
  • Interaction cost should be interpreted with task value, risk, accessibility, and context.
  • High interaction cost can be physical, cognitive, temporal, navigational, or emotional.

Applied at Userhub

Interaction cost is relevant when Userhub evaluates whether digital services, forms, portals, dashboards, and content journeys require avoidable effort from users.

See Userhub UX Lab for applied UX research and evaluation context.

Sources and references

  • Card, S. K., Moran, T. P., & Newell, A. (1983). The Psychology of Human-Computer Interaction. Lawrence Erlbaum Associates.
  • Gray, W. D., & Boehm-Davis, D. A. (2000). Milliseconds matter: An introduction to microstrategies and to their use in describing and predicting interactive behavior. Journal of Experimental Psychology: Applied, 6(4), 322–335. https://doi.org/10.1037/1076-898X.6.4.322
  • O’Hara, K. P., & Payne, S. J. (1999). Planning and the user interface: The effects of lockout time and error recovery cost. International Journal of Human-Computer Studies, 50(1), 41–59. https://doi.org/10.1006/ijhc.1998.0234
  • Pirolli, P., & Card, S. (1999). Information foraging. Psychological Review, 106(4), 643–675. https://doi.org/10.1037/0033-295X.106.4.643

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Cite this entry

APA

Userhub. (2026). Interaction Cost. UX Reference. https://userhub.com.bd/reference/interaction-cost/