Dieter Thoma, born in 1976, is assistant professor of English Linguistics at the University of Mannheim (Germany). He studied at the University of Mannheim and the University of Swansea (UK) and received his Diploma (MSc) in Business, English, and Business Education and his Doctorate (Dr.) in English Linguistics and Psycholinguistics in 2003 and 2009.

• Contents: Validity in language testing – Testing languages for specific purposes and business English – Yes/no vocabulary test – Validation study – Business English vocabulary test – Models of lexical knowledge and metacognitive decision behaviour – Guessing – Risk attitude – Polynomial scoring models.

Dieter Thoma, born in 1976, is assistant professor of English Linguistics at the University of Mannheim (Germany). He studied at the University of Mannheim and the University of Swansea (UK) and received his Diploma (MSc) in Business, English, and Business Education and his Doctorate (Dr.) in English Linguistics and Psycholinguistics in 2003 and 2009.

• Contents: Validity in language testing – Testing languages for specific purposes and business English – Yes/no vocabulary test – Validation study – Business English vocabulary test – Models of lexical knowledge and metacognitive decision behaviour – Guessing – Risk attitude – Polynomial scoring models.

Dieter Thoma, born in 1976, is assistant professor of English Linguistics at the University of Mannheim (Germany). He studied at the University of Mannheim and the University of Swansea (UK) and received his Diploma (MSc) in Business, English, and Business Education and his Doctorate (Dr.) in English Linguistics and Psycholinguistics in 2003 and 2009.

• Contents: Validity in language testing – Testing languages for specific purposes and business English – Yes/no vocabulary test – Validation study – Business English vocabulary test – Models of lexical knowledge and metacognitive decision behaviour – Guessing – Risk attitude – Polynomial scoring models.