Can I measure the motivation of students by asking direct questions such as 'The use of the system has motivated me' or do I need to use one of the motivation theories such as Theories of Motivation and ARCS model?
Yes, but you will probably need to choose the right question! You could be more specific e.g. the use of the system has motivated me to do X. Also you might want to measure motivation using proxy measures e.g. some activity that they have done that demonstrates they are motivated.
I think, you can measure the motivation of your students by asking direct questions through the Motivation Questionnaire. Maybe the foremost approach to measuring motivation which should be mentioned is observation of overt behaviors, which is assumed to be outcomes of an internal state of a person's motivation (West & Uhlenberg, 1970). Also, several basic types of appraisal techniques have been used to motivation. For the aim of the present question, there are five classifications:
(1) production measures,
(2) self-report instruments,
(3) observer ratings,
(4) projective tests, and
(5) objective tests.
A detail analysis of these techniques is presented in the following article.
You can gather data quantitatively or qualitatively to measure the motivation of students. However, you should consider the validity of your tool, questions, instrument in data gathering to answer your research questions or accept/deny your hypothesis.Theories on motivation are used as guide in the entire process of the research study.The theory used in research demonstrates the starting point of the research problem and the direction of the conduct of study.
What do you think about measuring whith a normal motivation questionnaire and compare the answers whith the results (cues showing motivation, involvement and interest) in some exercises or representative tasks?
Yes to the question, and careful for the approach. You need to ask questions extracted from the different theories (leading actions that match certain theories), I say that you may start with Focus Groups and from there improve the process to include better questions using a Cascading style.
Definitely yes. You should follow the right methodology of constructing, testing and analysing the survey. Some good examples are available. Some of which are:
1. HEIs Quality Improvement Through Students and Academic Staff’s Perception: Data Analysis and Robustness of the Results. International Journal for Quality Research, 2017, Vol.11, No.2, pp.261-278.
2. Validity and Reliability of Students and Academic Staff’s Surveys to Improve Higher Education. Educational Alternatives, Journal of International Scientific Publications, 2016, Vol.14, pp. 242-263 .