Copyright © 2017 by SCITEPRESS ¿ Science and Technology Publications, Lda. All rights reserved. Trustworthiness in software is of vital importance to technology users, especially in health, where lives may depend on the correct application of software that is fit for purpose. Despite the risk posed by improper use of technology in the health domain, there is evidence to suggest that stakeholders often trust the software without fully appreciating the possible consequences. In this paper, we explore what determines trustworthiness in healthcare software solutions. While there are often claims of improved quality of care, increased safety and improved patient outcomes using healthcare technology ¿ the scientific basis for such claims appear to be uncritically accepted. Ultimately, this can lead to a surge in healthcare software solutions, some of which may be misaligned with healthcare needs and potentially lead to fatal outcomes. To support health technology stakeholders, we propose a `trustworthiness healthcare software model¿ that can be employed to assess the level of trustworthiness associated with healthcare software solutions.