Software as a Service provides a general framework to encapsulate the underlying software functionalities as products to fulfill various requirements on the customer side. This general framework allows for modular service requirements decomposition and modular service composition during the development, operation and maintenance and evolution of the encapsulated software functionalities instantiated as services. Next generation of software services will become more context/situation-aware, self-aware and autonomous, ultra-mobile, ultra-fine-grained, ultra-trustworthy and driven by behaviors observed and captured from both the environment and humans of concern. Entering the Internet of Things (IoT) era, data of a variety of modalities can be conveniently and rapidly collected for applying the state-of-the-art techniques cutting across the areas of machine learning, software engineering, pervasive computing, dependable computing, psychophysiological or brain science, autonomics, to name a few, to support cutting-edge applications. Moreover, human-centric concerns are of paramount importance in rendering software services in the IoT era, and must be continually addressed before, during and after deployment of the applications in view of the emergent and unavoidable ambiguities and uncertainties in the environments and from the end-users. Such a service-centric software endeavor brings about a new field of study hereby named Software Service Engineering (SSE), which can benefit from the prevalent body of knowledge and professional practice of software engineering methods and tools, as well as advances in other disciplines. The Software Service Engineering (SSE) track seeks papers that address the above theme and future research directions. The coverage may intersect with service life cycle, requirements engineering, programming platforms and programming languages, big data, cloud and edge computing, software processes, Internet of Things and Cyber Physical Systems, and other relevant topics to facilitate the development, delivery, deployment and evolution of software services through applying proven and emerging software engineering methodologies. Relevant areas may also include advanced models, theoretical foundations, innovative applications domains, APIs and standards, SSE processes, etc. Papers submitted to this special track on Software Service Engineering will be rigorously peer reviewed, and selected papers will be published in the IEEE ICWS proceedings. We are interested in, but not limited to, the following list of topics. [Special Track] Software Service Engineering - IEEE ICWS Emerging software service models and novel software architectures for SSE Human-centric concerns (e.g. desire, intention, sentiment) in SSE; personalization or individualization of software services SSE for handling ambiguities and uncertainties of end-users Context-aware, situation-aware, self-aware, autonomous, emergent, ultra-mobile, ultra-fine grained (microservice) and autonomous software services Dynamic, on-demand, situational, adaptive and dependable software service deployment and evolution Theoretical foundations of SSE Programming systems/programming platforms/programming paradigms and executable and verifiable specifications for SSE Requirements engineering for SSE (dynamic, on-demand, intelligent and instantly defined service requirements, etc.) SSE for innovative and intelligent application domains Novel service-oriented architectural decomposition, microservices, UI, APIs & standards in the era of cloud/edge computing for SSE SSE enabled by agile processes, continuous integration, continuous delivery/deployment, continuous adaptation and DevOps AI and ML (unsupervised, supervised and self-supervised) techniques for SSE The SSE approach to SDx (Software Defined Everything) Submission Link Please submit your ISASSE paper at EasyChair.org: https://easychair.org/conferences/?conf=ieeeicws2021. Important Dates (at 5:00am UTC) Optional early paper submission: March 1, 2021 Improvement suggestions to early papers: April 1, 2021 Normal paper submission: April 15, 2021 Rebuttal phase: June 1 - 7, 2021 Final notification to authors: June 17, 2021 Camera-ready paper and registration due: July 1, 2021 Organization Advisory Committee Carl K. Chang, Iowa State University Rong Chang, IBM Research, TJ Watson Research Center Sumi Helal, University of Florida Symposium General Chair Zhi Jin, Peking University Symposium Program Chairs/Track Chairs for ICWS SSE: Xuanzhe Liu, Peking University Hua Ming, Oakland University Paolo Ceravolo, University of Milan