1.   Psychometric tests

A.  Measure extent of some dimension

1.    e.g. How well has little Johnny mastered English?  Does Kanzi reallly have the comprehension of a seven year old human?

2.    WhatŐs English?

B.  Characteristics

1.    Valid

2.    Reliable

3.    Standardized

C.  Some example tests

1.    BinetŐs intelligence test

2.    Pilot selection tests

3.    Bayley scales of infant development

4.    Illinois test of psycholinguistic abilities

D.  Test manuals contain:

1.    How to give it?

2.    Information on scoring

3.    Information on evaluating individual

a)   Comparison with reference group

4.    Reliability information

5.    Validity information

a)   Language tests reflect the current conception of language knowledge at the time of the testŐs development.

2.   DELV screening

A.  Materials

1.    Scoring forms

2.    Test materials

3.    Test manual information

B.  Reliability

1.    Compare results from two screenings

a)   ~75% agreement

C.  validity

1.    agreement with clinical judgment, relation with other measures of language development

2.    test content samples range of language knowledge and skills (JL, this is a major advance over older measures, especially in regards to grammar.

D.  Interpretation of scores (standardization)

1.    Language variation status (pronunciation differences in dialects of English)

2.    Judgment of possible risk status on morpho-syntax and wh-questions and repetitions based on number of errors

3.    Authors determined norms for children ages 4 to 9 on these items in terms of number of items passed.

4.    Children found at risk on the screening test are to be evaluated in more detail, using perhaps the DELV criterion referenced test.  This test more thoroughly evaluates four language ŇdomainsÓ or levels – syntax, pragmatics, semantics, and phonology.  More on this test later.