Reference work
Experience curve effects
Wikipedia
Encyclopedia summary of the learning-curve literature (Wright's law) and of published progress ratios. Basis of the beginner and intermediate hour model, which remains an estimate.
Open the source- Consulted
- October 10, 2026
- Language
- en
Cited by
Guides
- Building a paver or slab patio
- Building a paver walkway
- Building a paver driveway
- Building a paver pool deck
- Building a block garden wall or retaining wall
- Building outdoor block or slab steps
- Before you dig: locates, permits and property lines
- Yard drainage: slopes, downspouts, French drain, catch basin and dry well
- Grading the yard around your house
- Laying sod on good topsoil
- Automatic sprinkler system: the basics
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What we take from it
- Published progress ratios range from 0.75 to 0.90. At 0.85, a beginner takes about 2.65 times and an intermediate DIYer about 1.92 times the hours of an experienced crew (model, estimate).
- Wright's law links task time to the number of repetitions; published progress ratios range from 0.75 to 0.90.
- Under Wright's law, work time falls by a fixed ratio each time experience doubles; published ratios run from 0.75 to 0.90, which gives the beginner and intermediate factors used here.