Discusses the problems of modelling natural wind in a wind tunnel and notes lack of comparison between full-scale and wind tunnel studies. Reviews past work which often shows marked discrepancies in wind tunnel data. Reports results of a study carried out in the field of wind effects on a half full-size single storey model building. Wind profiles over the site were measured and pressure effects experienced by the model recorded. Gives pressure diagrams for model and states that investigation yielded valuable data which were used in a comparison with theresults of a subsequent wind tunnel study, the results of which will be published later.