Observation and the Hawthorne Effect: Sampling Limits
Distinguish selection bias, classification error and reactivity when observing work activities.
WORKSAMP · LEARNING RESOURCES
Work Sampling guides
Practical guides to design observations, interpret results and apply work sampling with clear assumptions.
What do you need to work on?
Statistical foundations
Sample size, precision, confidence intervals and the limits of inference.
Explore guidesStudy design
Observation plans, categories, routes and reliable data capture.
Explore guidesResults and decisions
Proportions, time, capacity and improvement decisions grounded in data.
Explore guidesIndustry applications
Examples and limits in manufacturing, maintenance and services.
Explore guidesIndustrial management
Tools, organization and context for putting a study into practice.
Explore guidesArticles and practical examples
Showing 49–60 of 92
Environmental Conditions and Fatigue: Sampling Limits
Relate activity observations to environmental conditions without replacing occupational risk assessment or inferring causation.
Validation of Existing Time Standards
Check time standards against comparable data, accounting for method, rating, allowances and variability.
Introduction: The hidden problem of productivity
Convert time proportions into equivalent hours using an explicit time base without treating them as realised savings.
What is a Confidence Interval and why does your Plant need it?
Interpret a confidence interval and communicate uncertainty without assigning probabilities to the fixed parameter.
Work Sampling in Hospitals and Services
What work sampling can contribute in hospitals and services, with limits on interpreting quality, workload and care outcomes.
Work Sampling in Maintenance
Estimate maintenance time distribution and distinguish direct work, support, waiting and service outcomes.
When NOT to Use Work Sampling
When to complement or replace work sampling: rare events, cycle times, precision and limits of observation.
Pace Rating Scales: ILO vs Bedaux
Interpret ILO and Bedaux rating scales, their reference performance levels and the limits of observational rating.
The Pilot Study: Refining the Sample
Use a pilot to test categories, coverage and study feasibility without assuming automatic statistical guarantees.
Union Negotiation Based on Objective Data
Present activity data in labour discussions while respecting context, uncertainty and individual rights.
Calculating Standard Time from Work Sampling
Estimate time per unit from sampling and identify the production, rating and allowance data required for standard time.
Search covers all the guides in this collection, not just the current page.
From a question to a study you can use
Explore the app or ask about a demonstration using your context.
Explore WorkSamp →