This paper reports the results of 102 completed questionnaires from experienced simulation practitioners on their modelling process in their most recent completed simulation project. A particular focus is on conceptual modelling but the survey also provides data on the other modelling topics including the proportion of time spent and a Gantt chart. Results include most projects making changes to the conceptual model during subsequent modelling topics, a tendency for the conceptual model to become more complex and considerable overlapping between modelling topics.