Another limitation is the way the questionnaire
was applied. Students were asked to answer the questions without actually solving the problems. That is why their perceptions are based only on the first impression of a problem.
Moreover the students did not get any information about differences or common features of the three kinds of problems when they were asked about their perceptions.
The responses may change if students are asked solve the problems first and answer the questions about their affect afterwards or if information about differences in modelling, word and intra-mathematical problems are a part of the teaching unit.
The investigation of differences between these approaches is an interesting research
question, because it can provide evidence on a change of task-specific affect while
working on different problem types.