Erwin Hans

Full professor Operations Management in Healthcare

Center for Healthcare Operations Improvement & Research (CHOIR website)
Tel: (+31 53 489)3523/ 3912 (secretary)

E-mail: e.w.hans@utwente.nl

Address

University of Twente
Faculty of Behavioural Management and Social Sciences
Dep. Industrial Engineering and Business Information Systems
Room: RA-3345 (Ravelijn is building 10 on the campus map)
P.O. Box 217, 7500 AE, Enschede
The Netherlands

Research interests

Healthcare operations research / operations management

Research

Erwin W. Hans is a Professor Operations Management in Healthcare with full tenure. He obtained his MSc degree in Applied Mathematics in 1996, specializing in mathematical modeling and operations research. He received his doctorate from University of Twente in 2001, having studied resource capacity planning with applications in discrete manufacturing and project environments. He now works in the department Industrial Engineering & Business Information Systems and within the University of Twente. His research focuses on the area of healthcare process optimization using modeling and optimization techniques from Operations Research and Management Science. He co-founded the Center of Healthcare Operations Improvement & Research (CHOIR – http://www.utwente.nl/choir), the Netherlands’ center of expertise in healthcare logistics. He works with several (university) hospitals, and has studied applications like the operating theater, ICU, and radiology departments.

Teaching

PhD lectures:

GP-OML/LNMB lecture “Operations Research and Health Care” (with prof.dr. J.J. van de Klundert)
Beta lecture “Research Perspectives on Operational Processes” (with various other lecturers)

BSc and MSc:

Lecturer and tutor for Industrial Engineering and Management
Lecturer and tutor for Health Sciences

Publications

For an updated list, see PURE, Google Scholar, ORCID, ResearchGate.

Borgman N.J., Vliegen I.M.H., Boucherie R.J., Hans E.W. (2016) Appointment scheduling with unscheduled arrivals and reprioritization. To appear in: Flexible Machines and Manufacturing
Vieira B., Hans E.W., Van Vliet-Vroegindeweij C., Van de Kamer J., Van Harten W.H. (2016) Operations research for resource planning and -use in radiotherapy: a literature review. BMC Medical Informatics and Decision Making, 16(1):149 (research.utwente)
Molina-Pariente J.M., Hans E.W., Framiñan J.M. (2016) A stochastic approach for solving the operating room scheduling problem. To appear in: Flexible services and manufacturing journal. ISSN 1936-6582
Oude Vrielink R.A., Hans E.W. (2016) Integriteit in onderwijslogistiek onderzoek. In: Miriam de Graaff & Michelle Schut (Eds.), Integriteit in de praktijk: boots on the ground meet science. Centrale Organisatie Integriteit Defensie.
Oude Vrielink R.A., Schepers D., Jansen E.A., Hans E.W., Hillegersberg, J. van (2016) Practices in Timetabling in Higher Education Institutions. In: PATAT 2016, 11th International Conference on the Practice and Theory of Automated Timetabling, 23-08-2016 - 26-08-2016, Udine, Italy (pp. 295 - 316).
Leeftink A.G., Boucherie R.J., Hans E.W., Verdaasdonk M.A.M., Vliegen I.H.M., Diest P.J. van (2016) Batch scheduling in the histopathology laboratory. To appear in: Flexible Machines and Manufacturing
Leeftink A.G., Boucherie R.J., Hans E.W., Verdaasdonk M.A.M., Vliegen I.H.M. and Diest P.J. van (2016) Predicting turnaround time reductions of the diagnostic track in the histopathology laboratory using mathematical modelling. To appear in: Journal of Clinical Pathology
Molina-Pariente J.M., Hans E.W., Framiñan J.M., Gomez-Cia T. (2015) New heuristics for planning operating rooms. Computers & Industrial Engineering 90:429-443. ISSN 0360-8352
Masmoudi M., Hans E.W., Leus R., Haït A. (2016). Tactical project planning under uncertainty: fuzzy approach. European J. of Industrial Engineering (EJIE), 10(3):301-322. ISSN 1751-5262
Hans, E.W. (2015) Is it better now, doctor? (English translation) Inaugural speech for accepting the chair Operations Management in Healthcare on April 9, 2015.
Hans E.W. (2015) Gaat het nu wat beter, dokter? Inaugural speech for accepting the chair Operations Management in Healthcare on April 9, 2015
Hulshof P.J.H. and Mes M.R.K. and Boucherie R.J. and Hans E.W. (2015) Patient admission planning using Approximate Dynamic Programming. Flexible Services and Manufacturing Journal 28(1-2):30-61. ISSN 1936-6582
Borgman N., Mes M.R.K., Vliegen I.M.H., Hans E.W. (2015) Improving the Design and Operation of an Integrated Emergency Post using Simulation. Journal of Simulation 9(2):99-110 (doi:10.1057/jos.2014.5).
Van Der Kooij R., Mes M.R.K., Hans E.W. (2015) Simulation framework to analyze Operating Room release mechanisms. Proceedings - Winter Simulation Conference, 2015: 1144-1155.
Van der Veen E., Hans E.W., Post G.F., Veltman B. (2015) Shift rostering using decomposition: assign weekend shifts first. Journal of Scheduling 18(1):29-43. ISSN 1094-6136
Hans E.W., Vliegen I.M.H. (Eds.). (2014). Operations research for health care, 3(2).
Hans E.W., Vliegen I.M.H. (2014) Editorial "Special issue of the 2012 conference of the EURO working group Operational Research Applied to Health Services (ORAHS). Operations research for health care, 3(2):47-47.
Kortbeek N., Zonderland M.E., Braaksma A., Vliegen I.M.H., Boucherie R.J., Litvak N., Hans E.W. (2014) Designing cyclic appointment schedules for outpatient clinics with scheduled and unscheduled patient arrivals. Performance Evaluation, 80:5-26.
Fügener A. Hans E.W., Kolisch R., Kortbeek N., Vanberkel P.T. (2014) Master surgery scheduling with consideration of multiple downstream units. European Journal of Operational Research, 239(1):227-236.
Van der Veen E., Hans E.W., Veltman B., Berrevoets L.M., Berden H.J.J.M. (2014) A case study of cost-efficient staffing under annualized hours. Healthcare Management Science 18(3):279-288.
Vliegen I.M.H., Bruens M.A., Mes M.R.K., Hans E.W., Doggen C.J.M. (2013) The effects of integrating an emergency department and general practioner cooperative into one emergency post. In: VIIth Mediterranean Emergency Medicine Congress, 8-11 September 2013, Marseille, France.
Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L. (2014) Optimizing the Strategic Patient Mix combining Queueing Theory and Dynamic Programing. Computers & Operations Research 43:271-279.
Masmoudi M., Hans E.W., Leus R., Haït A. (2013). Fuzzy Multi-project Rough-Cut Capacity Planning. In: Sequencing and Scheduling with Inaccurate Data. (Eds.) Y.N. Sotskov and F. Werner. pp. 1-16. ISBN 978-1-61209-579-0. Nova Science Publishers, Inc.
Van Urk R., Mes M.R.K., Hans E.W. (2013). Anticipatory Routing of Police Helicopters. Expert Systems With Applications 40(17): 6938-6947.
Boucherie R.J., Hans E.W., Hartmann T. (2012) Health care logistics and space: accounting for the physical build environment. In: Winter Simulation Conference, WSC 2012, 9-12 December 2012, Berlin, Germany.
Hulshof P.J.H., Kortbeek N., Boucherie R.J., Hans E.W., Bakker P.J.M. (2012) Taxonomic classification of planning decisions in health care: a review of the state of the art in OR/MS (Open Access). Health Systems, 1:129–175.
Van Essen J.T., Bosch J.M., Hans E.W., Van Houdenhoven M., Hurink J.L. (2014) Reducing the number of required beds by rearranging the OR-schedule. OR Spectrum 36(3):585-605.
Vanberkel P.T., Zonderland M.E., Boucherie R.J., Hans E.W. (2012). Leaving a mark on healthcare delivery with operations analysis. In: Commentaries to “The Vital Role of Operations Analysis in Improving Healthcare Delivery”, B.L. Golden, A. Seidmann (eds.), Manufacturing & Service Operations Management, 14(4):495-511
Kok A.L., Hans E.W., Schutten J.M.J. (2012). Vehicle routing under time-dependent travel times: the impact of congestion avoidance, Computers & Operations Research 39: 910-918.
Linde van der G.R., Borgman N.J., Mes M.R.K., Vliegen I.M.H., Bruens M.A., Doggen C.J.M., Hans E.W., Snel J.E., Drost A. (2012) Organisatie van de acute zorgketen: de effecten en optimalisatie van een geïntegreerde spoedpost (in Dutch). In: Symposium Trends Acute Zorg 2012 "Tot overmaat van ramp", June 7, 2012, Enschede.
Vanberkel P.T., Zonderland M.E., Boucherie R.J., Hans E.W. (2012). Leaving a mark on healthcare delivery with operations analysis.
Carter M.W., Hans E.W., Kolisch R. (2012). Health Care Operations Management (editorial). OR Spectrum, 34(2):315-317.
Hulshof P.J.H., Vanberkel P.T., Boucherie R.J., Hans E.W., Van Houdenhoven M., Van Ommeren J.C.W. (2012). Analytical models to determine room requirements in outpatient clinics. OR Spectrum, 34(2):391-405.
Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Litvak N. (2012). Efficiency evaluation for pooling resources in health care. OR Spectrum, 34(2):371-390.
Van Lent W.A.M., Deetman J., Teertstra J., Muller S.H., Hans E.W., Van Harten W.H. (2012). Reducing the throughput time of the diagnostic track involving CT scanning with computer simulation. European Journal of Radiology, 81(11):3131-40 (research.utwente).
Hulshof P.J.H., Boucherie R.J., Hans E.W., Hurink J.L. (2012) Tactical resource allocation and elective patient admission planning in care pathways. Health Care Management Science 16(2):152-66.
Van Essen J.T., Hans E.W., Hurink J.L., Oversberg A. (2011) Minimizing the waiting time for emergency surgery. Operations Research for Health Care, 1(2-3): 34-44. ISSN 2211-6923.
Hulshof P.J.H., Boucherie R.J., Van Essen J.T., Hans E.W., Hurink J.L., Kortbeek N., Litvak N., Vanberkel P.T., Van der Veen E., Veltman B. (2011). ORchestra: an online reference database of OR/MS literature in health care. Health Care Management Science, 14(4), pp. 383-384.
Masmoudi M., Hans E.W., Haït A. (2011). Fuzzy tactical project planning: Application to helicopter maintenance. 16th IEEE International Conference on Emerging Technologies and Factory Automation, ISBN 978-1-4577-0017-0, pp. 1-8 (ETFA 2011).
Hans E.W., Van Houdenhoven M., Hulshof P.J.H. (2011). A framework for health care planning and control. Handbook of Health Care Systems Scheduling. Hall, Randolph (Ed.). Springer International Series in Operations Research & Management Science, Vol. 168. Chapter 12 (research.utwente).
Hans E.W., Vanberkel P.T. (2011). Operating Theatre Planning and Scheduling. Handbook of Health Care Systems Scheduling. Hall, Randolph (Ed.). Springer International Series in Operations Research & Management Science, Vol. 168. Chapter 5.
IJzerman M.J., Hans E.W., Siesling S., Klaase J.M. (2011) Optimization of follow-up scenarios following breast cancer: poster. In: 33rd Annual Meeting of the Society for Medical Decision Making, SMDM 2011, October 22-26, 2011, Chicago, IL, USA.
Hans E.W., Van de Velde S.L. (2011). The Lot Sizing and Scheduling of Casting Operations. International Journal of Production Research, 49 (9), pp. 2481-2499.
Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Van Lent W.A.M., Van Harten W.H. (2011). An exact approach for relating recovering surgical patient workload to the master surgical schedule. Journal of the OR Society 62 (10): 1851–1860. Memorandum 1908, Department of Applied Mathematics, University of Twente, Enschede. ISSN 1874-4850.
Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Van Lent W.A.M., Van Harten W.H (2011). Accounting for Inpatient Wards when developing Master Surgical Schedules. Anesthesia and Analgesia 112(6), pp. 1472-1479.
Kok A.L., Hans E.W., Schutten J.M.J. (2011). Optimizing Departure Times in Vehicle Routes. European Journal of Operational Research, 210(3): 579-587, and in: Beta working paper 236.
Van Elteren J.J., Kwast A.B.G., Hans E.W., Van de Wetering G., IJzerman M.J., Klaase J.M., Siesling S. (2010) Individualized breast cancer follow-up; cost-effectiveness of various scenarios. European Journal of Cancer Supplements, 8 (3)., pp. 215-216. ISSN 1359-6349
Kok A.L., Hans E.W., Schutten J.M.J., Zijm W.H.M. (2010). A Dynamic Programming Heuristic for Vehicle Routing with Time-Dependent Travel Times and Required Breaks. Flexible Services and Manufacturing Journal, 22, pp. 83-108.
Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Litvak N. (2010). A Survey of Health Care Models that Encompass Multiple Departments, International Journal of Health Management and Information, 1(1), pp. 37-69 (slides, summary).
Kok A.L., Hans E.W., Schutten J.M.J., Zijm W.H.M. (2010) Vehicle Routing with Traffic Congestion and Drivers' Driving and Working Rules. [Internal Report]
Van Oostrum J.M., Bredenhoff E., Hans E.W. (2010). Suitability and managerial implications of a Master Surgical Scheduling approach, Annals of OR, 178(1), pp. 91-104.
Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Litvak N., Van Lent W.A.M., Van Harten W.H. (2010). Reallocating Resources to Focused Factories: A Case Study in Chemotherapy, In: J. Blake & M. Carter (Eds.), Proceedings of the 34^th meeting of the European Working Group on Operational Research Applied to Health Services, ORAHS, 152-164. (research.utwente, BETA working paper 259, slides). ISBN 9780986617904
Vanberkel P.T., Hans E.W. (2009). Holistic healthcare modeling. A viewpoint on managing the complete patient care chain, Book contribution: Operational Research Applied to Health Services in Action, ISBN 978-83-7493-409-1, publisher: Oficyna Wydawnicza Politechniki Wrocławskiej (research.utwente).
Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Litvak N. (2009). Designing for Economies of Scale vs. Economies of Focus in Hospital Departments. Proceedings of Innovation in Design and Management of Healthcare Facilities and Healthy Environments Research Day, Rotterdam, The Netherlands.
Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Litvak N. (2009). Designing for Economies of Scale vs. Economies of Focus. Submitted: Health Environments Research and Design Journal.
Hans E.W., Wullink G., Van Houdenhoven M., Kazemier G. (2008), Robust Surgery Loading, European Journal of Operational Research, 185, pp. 1038-1050.
Sibma T.S., Klaase J.M., Siesling S., Hans E.W., Hummel J.M., IJzerman M.J. (2008). Cost-effectiveness and preference for follow-up scenarios following breast-cancer, Value in Health, 11(6), 489-490.
Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Litvak N., Van Lent W.A.M., Van Harten W.H. (2008). Reallocating Resources to Focused Factories: A Case Study in Chemotherapy, BETA working paper 259.
Van Oostrum J.M., Van Houdenhoven M., Vrielink M.M.J., Klein J., Hans E.W., Klimek M., Wullink G., Steyerberg E.W., Kazemier G. (2008). A Simulation Model for Determining the Optimal Size of Emergency Teams on Call in the Operating Room at Night, Anesthesia Analgesia, 107(5), pp. 1655-1662.
Van Oostrum J.M., Van Houdenhoven M., Hurink J.L., Hans E.W., Wullink G., Kazemier G. (2008). A Master Surgical Scheduling approach for cyclic scheduling in operating room departments, OR Spectrum, 30(2), pp. 355-374.
Van Houdenhoven M., Van Oostrum J.M., Wullink G., Hans E.W., Hurink J.L., Bakker J., Kazemier G. (2007). Fewer intensive care unit refusals and a higher capacity utilization by using a cyclic surgical case schedule, Journal of Critical Care, 23, pp. 222-226.
Wullink G., Van Houdenhoven M., Hans E.W., Van Oostrum J.M., Van der Lans M., Kazemier G., (2007). Closing emergency operating rooms improves efficiency, Journal of Medical Systems, 31(6), pp. 543-546.
Hans E.W., Nieberg T. (2007). Operating Room Manager Game, INFORMS Transactions on Education, 8(1), September 2007.
Van Houdenhoven M., Hans E.W., Klein J., Wullink G., Kazemier G. (2007). A Norm Utilisation For Scarce Hospital Resources: Evidence from Operating Rooms in a Dutch University Hospital, Journal of Medical Systems, 31(4), pp. 231-236.
Hans E.W., Leus R., Wullink G., Herroelen W. (2007). A hierarchical approach to multi-project planning under uncertainty, OMEGA, International Journal Of Management Science, 35(5), pp. 563-577.
Van Hoorn A.F., Van Houdenhoven M., Wullink G., Hans E.W., Kazemier G. (2007). Een duurzaam stappenplan voor benchmarking (in Dutch), Controlling, Nr. 3, maart 2007.
Hans E.W., Nieberg T., Van Oostrum J. (2007). Optimization in Surgery Planning. MET Volume 15(1), pp. 20-28.
Van Houdenhoven M., Van Oostrum J.M., Hans E.W., Wullink G., Kazemier G. (2007). Improving OR efficiency by applying bin-packing and portfolio techniques to surgical case scheduling. Anesthesia & Analgesia, 105(3), pp. 707-714.
Van Oostrum J.M., Van Houdenhoven M., Wullink G., Hans E.W., Kazemier G. (2006). Hoge OK benutting en minder afgevallen patiënten door cyclisch plannen (in Dutch), 'Benchmarking OK - Leren van elkaar', Van Houdenhoven M., Van Hoorn A.F., Kalkman C.J. and Kazemier G. (eds), Springer, Baarn/Leusden, pp. 13-120.
Van de Pol M., Van Houdenhoven M., Wullink G., Hans E.W., Kazemier G. (2006). Geïntegreerde OK-IC planning zorgt voor hogere OK-benutting en minder afgevallen patiënten (in Dutch), 'Benchmarking OK - Leren van elkaar', Van Houdenhoven M., Van Hoorn A.F., Kalkman C.J. and Kazemier G. (eds), Springer, Baarn/Leusden, pp. 127-136.
Van Oostrum J., Van der Lans M., Van Houdenhoven M., Hans E.W., Wullink G., Kazemier G. (2006). Wachttijdverkorting voor spoedpatiënten door schuiven met de planning van electieve operaties (in Dutch), 'Benchmarking OK - Leren van elkaar', Van Houdenhoven M., Van Hoorn A.F., Kalkman C.J. and Kazemier G. (eds), Springer, Baarn/Leusden, pp. 147-154
Wullink G., Van der Lans M., Van Houdenhoven M., Hans E.W., Kazemier G. (2006). Eén spoed-OK is geen spoed OK (in Dutch), 'Benchmarking OK - Leren van elkaar', Van Houdenhoven M., Van Hoorn A.F., Kalkman C.J. and Kazemier G. (eds), Springer, Baarn/Leusden, pp. 165-172
Van Houdenhoven M., Hans E.W., Van Hoorn A.F., Pullen N., Van Barneveld R., Krijgsman H., Boer F., Kazemier G. (2006). Eenduidige tijdsregistratie operatiekamers (in Dutch), 'Benchmarking OK - Leren van elkaar', Van Houdenhoven M., Van Hoorn A.F., Kalkman C.J. and Kazemier G. (eds), Springer, Baarn/Leusden, pp. 173-177
Wullink G., Van Houdenhoven M., Vrielink M., Klein J., Hans E.W., Klimek M., Van Oostrum J., Steyerberg E., Kazemier G. (2006). Veilig de nacht door! Efficiënter plannen zorgt voor minder kosten en grotere beschikbaarheid (in Dutch), 'Benchmarking OK - Leren van elkaar', Van Houdenhoven M., Van Hoorn A.F., Kalkman C.J. and Kazemier G. (eds), Springer, Baarn/Leusden, pp. 137-142
Van Oostrum J.M., Van Houdenhoven M., Hans E.W., Wullink G., Kazemier G. (2006). Sequencing surgical procedures to minimize emergency waiting time, submitted to Anesthesia Analgesia, 2006.
Van Hoorn A.F., Van Houdenhoven M., Wullink G., Hans E.W., Kazemier G. (2006). Een nieuw stappenplan voor benchmarking (in Dutch), Management Executive 6-2006, November/December 2006.
Van Hoorn A.F., Van Houdenhoven M., Wullink G., Hans E.W., Kazemier G. (2006). De vijfde generatie benchmarking: een methode toegespitst op de gezondheidszorg (in Dutch), Sigma, 2006.
Van der Lans M., Hans E.W., Van Houdenhoven M., Hurink J.L., Wullink G. (2006). Anticipating Urgent Surgery in Operating Room Departments, BETA working paper WP-158, ISSN: 1386-9213, University of Twente, 2006.
Van de Pol M.A., Van Houdenhoven M., Hans E.W., Boersma E., Bax J.J., Feringa H.H., Schouten O., Van Sambeek R.H.M., Poldermans D. (2006). Influence of Cardiac Risk Factors and Medication on Length of Hospitalization for Patients Undergoing Major Vascular Surgery, American Journal of Cardiology, 97(10), pp. 1423-1426, May 15, 2006. Epub Mar 23, 2006.
Elkhuizen S.G., Van Sambeek J.R.C., Hans E.W., Krabbendam J.J., Bakker P.J.M. (2006). Applying the Variety Reduction Principle to management of ancillary services, Health Care Management Review 32(1), pp. 37-45, 2006.
Ebben M.J.R., Hans E.W., Olde Weghuis F.M. (2005). Workload based order acceptance in job shop environments, OR Spectrum, 27(1), pp. 107-122.
Wullink G., Hans E.W., Van Harten A. (2004). Robust Resource Loading for Engineer-To-Order manufacturing, BETA working paper WP-123, ISSN: 1386-9213.
Wullink G., Gademann A.J.R.M., Hans E.W., Van Harten A. (2004). Scenario-based approach for flexible resource loading under uncertainty, Int. Journal of Production Research, 42(24), pp. 5079-5098.
Hans E.W. (2001). Resource loading by branch-and-price techniques, Ph.D. thesis, University of Twente, 2001.
Hans E.W. (2001). Resource loading by branch-and-price techniques: models and algorithms, BETA working paper WP 87, ISSN 1386-9213, 2001.
Van Assen M.F., Hans E.W., Van de Velde S.L. (2000). An Agile Planning & Control Framework for Customer-Order Driven Discrete Parts Manufacturing Environments, International Journal of Agile Management Systems 2(1), pp. 16-23.
Giebels M.M.T., Hans E.W., Gerritsen M.P.H., Kals H.J.J. (2000). Capacity planning for make- or engineer-to-order manufacturing; the importance of order classification, conference proceedings of the 33^rd CIRP International Seminar on Manufacturing Systems, Sweden, 2000.
Van Assen M.F., Hans E.W., Van de Velde S.L. (1998). A time-based planning & control framework for discrete parts manufacturing environments, Erasmus Management report series; no. 35-1998.
Van de Velde S.L., Hans E.W. (1998). Production Planning and Scheduling of a Cast-To-Stock Metal Foundry, Erasmus Management report series; no. 37-1998.
Hans E.W. (1997). ELMA- model of a liberalized electricity market, ECN report ECN-I-97-028.

Professional literature, periodicals

Glerum A., Rouppe van de Voort M., Hans E.W., Rigter S. (2016). Plannen naar de optimale mix (in Dutch). In: Zorgvisie Magazine Nr. 7, 2016 (2). 20-22. ISSN 1384-4199
Van der Veen E., Hans E.W. (2013) Eerst weekend! Wiskunde in dienst van een sociaal leven (in Dutch), StatOR 14(1), pp. 16-19.
Vanberkel P.T., Boucherie R.J., Hans E.W., Hurink J.L., Van Lent W.A.M., Van Harten W.H. (2012) Een planningsmethode voor reductie van de fluctuaties in de belasting van verpleegafdelingen (in Dutch), StatOR 12(2), pp. 4-8.
De Jong J., Vinduška H., Hans E.W., Post G. (2012). Polymetrisch metselen (in Dutch), StatOR 13(1), pp. 9-12.
Van hard werken naar efficiënt werken. Business Logistics, January 2011.
Van Harten W.H., Hans E.W., Van Lent W.A.M. (2010). Aanpak efficiency te ondoordacht (in Dutch), Medisch Contact 6, pp. 264-267 (link).
Kwaliteit, doelmatigheid en veiligheid - Zoektocht naar de balans. Alert, September 2010.
Van Houdenhoven M., Hans E.W., Van Hoorn A.F., Pullen N., Van Barneveld R., Krijgsman H., Boer F., Kazemier G. (2006). Eenduidige tijdregistratie operatiekamers - Definitiesysteem maakt onderlinge vergelijking mogelijk, Medisch Contact 61(2), January 13, 2006.
Wiskundigen in de bres voor ziekenhuizen, interview Elsevier, March 2, 2006 by Willem Wansink.
Hans E.W. (2003). Make-to-order planning vereist flexibiliteit, IT Logistiek, April 2003.

Presentations

Hans, E.W. (2015) Is it going better, doctor? (English translation) Inaugural speech for accepting the chair Operations Management in Healthcare on April 9, 2015.
Hans E.W. (2015). Gaat het nu wat beter, dokter? (In Dutch) Inaugural speech for accepting the chair Operations Management in Healthcare on April 9, 2015.

KEYWORDS: operations management, healthcare, health care, process optimization, logistics, planning, scheduling, capacity planning, workforce planning, operations research