This progress report describes a Swedish project which is seeking to develop and test materials for writing practice. Experimental materials focus on the sentence, giving students practice in the formation of more advanced constructions. Emphasis in the control program is on a variety of types of written composition (e.g., narratives, descriptions, summaries, arguments). Seven teachers in six upper secondary schools teach the experimental program in one class each and the control program in one class each. A placebo group of five classes whose teachers are not otherwise involved in the project is also included. Assessment is to be based on writing samples gathered before and after the teaching phase of the experiment. (AA)