[Source: Bilinguistics]

This is a question I have heard a lot lately.  Is there a certain point at which it is acceptable not to test bilingual children in both languages?  Take a look at the following table that comes from a workshop we do on evaluating bilinguals.

If a child falls into one of the boxes with a green check, they do not have a language impairment because they have skills in at least one language that fall within normal limits.  The red X indicates a child we are concerned about because their skills are below average in both languages.

Now let’s take a look at the following chart.  We have Spanish proficiency from least to greatest on the bottom (X) axis and English proficiency from least to greatest on the side (Y) axis.  Along the left side are monolingual English speakers and at the bottom part of

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