Worked-examples improve learning by reducing cognitive load during skill acquisition, and "is one of the earliest and probably the best known cognitive load reducing technique" (Paas et al., 2003). In particular, worked-examples provide instructions to reduce intrinsic cognitive load for the learner initially when few schemas are available.  Extraneous load is reduced by scaffolding of worked-examples at the beginning of skill acquisition. Finally, worked-examples can  increase germane load when prompts for self-explanations are used (Paas et al., 2003).
Worked-examples improve learning by reducing cognitive load during skill acquisition, and "is one of the earliest and probably the best known cognitive load reducing technique" (Paas et al., 2003). In particular, worked-examples provide instructions to reduce extraneous cognitive load and germane cognitive load for the learner initially when few schemas are available. Intrinsic cognitive load is a third type of cognitive load that provides a base load that is irreducible. Extraneous load is reduced by scaffolding of worked-examples at the beginning of skill acquisition. Finally, worked-examples can also increase germane load when prompts for self-explanations are used (Paas et al., 2003).
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intrinsic cognitive load
extraneous cognitive load and germane cognitive load
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Intrinsic cognitive load is a third type of cognitive load that provides a base load that is irreducible.
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also