John Krogstie (born 23 May 1967) is a Norwegian computer scientist, professor in information systems at the Norwegian University of Science and Technology (NTNU) in Trondheim, Norway, and an expert in the field of enterprise modelling.
John Krogstie received a MSc in 1991 and a PhD in 1995 both in information systems from the Norwegian University of Science and Technology. From 1991 to 2000 he was employed as a manager in Accenture. In 2000-2005 he was a senior researcher in SINTEF. He is a professor in information systems at NTNU in Trondheim, Norway.
John Krogstie is the Norwegian representative for IFIP TC8 and Chair (2010–2012) of IFIP WG 8.1 on information systems design and evaluation, where he is the initiator and leader of the task group for Mobile Information Systems.
Krogstie's research interests include information systems, conceptual modeling, mobile information systems, eGovernment and enterprise modelling.
The SEQUAL framework 
The SEQUAL framework is a reference model for evaluating the quality of models, the semiotic quality framework (SEQUAL) developed by John Krogstie. The SEQUAL framework is grounded in semiotics, particularly the semiotic theory of Charles W. Morris. It builds on semiotic theory and defines several quality aspects based on relationships between a model, a body of knowledge, a domain, a modeling language, and the activities of learning, taking action, and modeling. Its usefulness was confirmed in an 2002 experiment.
The basic idea behind the SEQUAL framework is, that conceptual models can be considered as sets of statements in a language, and therefore can be evaluated in semiotic/linguistic terms. A first semiotic framework for evaluating conceptual models was originally proposed by Lindland et al. in the 1994 article "Understanding quality in conceptual modeling". In its initial version, it considered three quality levels:
- semantic, and
- pragmatic quality
The framework was later extended, and called the SEQUAL framework by Krogstie et al. in the 1995 article "Defining quality aspects for conceptual models". In the 2002 article "Quality of interactive models" Krogstie & Jørgensen extended the initial framework adding more levels of Stamper’s semiotic ladder.
See also 
- 2005. Information modeling methods and methodologies. With Terry Halpin and Keng Siau (editors).
- 2007. Conceptual Modelling in Information Systems Engineering. With Andreas Lothe Opdahl and Sjaak Brinkkemper.
- 2008. Active Knowledge Modeling of Enterprises. With Frank Lillehagen. Springer, 2008. ISBN 3-540-79415-8
- John Krogstie, About The Author/Editor. Accessed 02 Feb 2009.
- CURRICULUM VITAE 24/7/2008. Accessed 02 Feb 2009.
- John Krogstie et al. (2006). "Process models representing knowledge for action: a revised quality framework". In: European Journal of Information Systems (2006) 15, pp.91–102.
- Jan Mendlin et al. (2006) "On the Correlation between Process Model Metrics and Errors" Conference paper.
- D.L. Moody, et al. (2002). "Evaluating the quality of process models: Empirical testing of a quality framework". In: Stefano Spaccapietra et al. (ed.) Conceptual Modeling - ER 2002, Proceedings, LNCS 2503, pp. 380-396.
- O.I. Lindland, G. Sindre and Arne Sølvberg (1994) "Understanding quality in conceptual modeling". In: IEEE Software 11(2), 42–49.
- KROGSTIE J, LINDLAND OI and SINDRE G (1995) "Defining quality aspects for conceptual models". In: Proceedings of the IFIP8.1 Working Conference on Information Systems Concepts (ISCO3): Towards a Consolidation of Views, 28–30 March, Marburg, Germany (FALKENBERG E, HESS W and OLIVE E, Eds), Chapman & Hall: London, UK.
- KROGSTIE J and JøRGENSEN HD (2002) "Quality of interactive models". In: First International Workshop on Conceptual Modelling Quality (IWCMQ’02), 11 October 2002. (OLIVE A, YOSHIKAWA M and YU E, Eds), Springer Verlag: Berlin, Germany.
- STAMPER R (1996) "Signs, norms, and information systems". In: Signs at Work. B. Holmqvist et al. (Eds). Walter de Gruyter: Berlin, Germany. pp 349–397.
- John Krogstie, List of publications from the DBLP Bibliography Server. Accessed 02 Feb 2009.
- See also John Krogstie scholar.google.no
- Homepage at the Norwegian University of Science and Technology (NTNU) in Trondheim, Norway.