Threats to construct validity should be reduced to a minimum. If true, sources of bias, namely raters, items, tests as well as gender, age, race, language background, culture, and socio-economic status need to be spotted and removed. This study investigates raters' experience, language background, and the choice of essay prompt as potential…

The present study discusses the relevance of measures of lexical diversity (LD) to the assessment of learner corpora. It also argues that existing measures of LD, many of which have become specialized for use with language corpora, are fundamentally measures of lexical repetition, are based on an etic perspective of language, and lack construct…

The article reports the development of the Structural Analysis of Written Language (SAWL), an instrument designed for use by classroom teachers in objectively documenting the ability of children to write in English. The SAWL allows teachers to use T-unit analysis to quantitatively assess language improvement regardless of whether the student…