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Models for simulated machinery costs, may not replace actual cost measurements but the information obtained through them can replace a farm\u2019s existing records, becoming more valuable to decision makers. MACHoice, a decision support system (DSS) presented in this paper, is a farm machinery cost estimator and break-even analyzer of alternatives for agricultural operations, developed using user-driven expectations and in close collaboration with agronomists and computer engineers. It integrates an innovative algorithm developed for projections of machinery costs under different rates of annual machine use and work capacity processing, which is crucial to decisions on break-even machinery alternatives. A case study based on the comparison of multiple alternatives for grape harvesting operations is presented to demonstrate the typical results that can be expected from MACHoice, and to identify its capabilities and limitations. This DSS offers an integrated and flexible analysis environment with a user-friendly graphical interface as well as a high level of automation of processing chains. The DSS-output consists of charts and tables, evidencing the differences related to costs and carbon emissions between the options inserted by the user for the different intensity of yearly work proceeded. MACHoice is an interactive web-based tool that can be accessed freely for non-commercial use by every known browser.<\/jats:p>","DOI":"10.1515\/opag-2019-0029","type":"journal-article","created":{"date-parts":[[2019,7,21]],"date-time":"2019-07-21T01:26:35Z","timestamp":1563672395000},"page":"305-321","source":"Crossref","is-referenced-by-count":6,"title":["MACHoice: a Decision Support System for agricultural machinery management"],"prefix":"10.1515","volume":"4","author":[{"given":"M.","family":"Cunha","sequence":"first","affiliation":[{"name":"Faculty of Sciences , University of Porto , Portugal , Rua do Campo Alegre, s.n., 4169-007 Porto , Portugal ; Geo-Space Sciences Research Center , University of Porto , Portugal ; Institute for Systems and Computer Engineering, Technology and Science (INESC TEC) , Rua Dr Roberto Frias, Porto 4200-465 , Portugal ; E-mail:mario.cunha@inesctec.pt"}]},{"given":"S.G.","family":"Gon\u00e7alves","sequence":"additional","affiliation":[{"name":"Faculty of Sciences , University of Porto , Portugal , Rua do Campo Alegre, s.n., 4169-007 Porto , Portugal ; Trigger Systems, Rua Dr. Joaquim Manso, 12B, 1500-241 Lisbon , Portugal ;"}]}],"member":"374","published-online":{"date-parts":[[2019,7,19]]},"reference":[{"key":"2022042708363750158_j_opag-2019-0029_ref_001_w2aab3b7c29b1b6b1ab1ab1Aa","unstructured":"Anderson A.W., Factors affecting machinery costs in grain production. 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