Validity || Reliability || Practicality - What's the difference !?

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LESSON SUMMARY

Reliability, Validity and Practicality
Reliability
 The degree to which we trust that the results we gain in 1 trial, will be achieved in repeat trials.
 Regardless of whether the assessor changes during a test, or multiple assessors are observing one performer, the same result should be garnished from the test.
 An indicator of a reliable test is the absence of anomalies.
 The less variation there is between each result recorded, the more reliable we can say a test is.
 The grip dynamometer test is reliable as it has simple processes and little opportunity for human error to impact results.
 The multi-stage fitness test has multiple variables and processes that can change between each trial, reducing its reliability.
Validity
 The idea that the quality of a test result is directly proportionate to the quality of the component of fitness being tested.
 Only muscular strength determines the score recorded in the grip dynamometer test.
 Multiple variables could influence the total time recorded in the Illinois agility test.
 The most valid tests are when just one component of fitness has any impact on the test result.
Practicality
 This is how quick and easy a test is to set up and complete.
 If an assessor can learn the procedures and educate the performer about them quickly, a test can be said to be practical.
 For a test to be practical, the equipment should be cheap, accessible and widely available.
 The wider the range of locations a test can be completed in, and the shorter amount of time it takes, the more practical a test is.
 The 1 minute sit up test is practical as it requires minimal equipment and can be completed quickly.
 The 35m Sprint test requires speed gates and a non-slip surface of 45m. All of which make the test less practical.