Title	Model Multiplicity (UML) Versus Model Singularity in System Requirements and Design
Author	Sabah Al-Fedaghi
Citation	Vol. 21  No. 4  pp. 103-114
Keywords	Requirements elicitation; conceptual modeling; model multiplicity; model singularity; static model; dynamic model; behavioral model

Title	The Role of Information and Communication Technology to Combat COVID-19 Pandemic: Emerging Technologies, Recent Developments and Open Challenges
Author	Muhammad Arshad
Citation	Vol. 21  No. 4  pp. 93-102
Keywords	COVID-19, Information and Communication Technology, Emerging Technologies, Coronavirus, Pandemic

Title	Care Cost Prediction Model for Orphanage Organizations in Saudi Arabia
Author	Huda N Alhazmi, Alshymaa Alghamdi, Fatimah Alajlani, Samah Abuayied, and Fahd M Aldosari
Citation	Vol. 21  No. 4  pp. 84-92
Keywords	Care cost, Orphanage organizations, Machine learning, Business analytic, Naive Bayes, Simple liner regression, Random Forest

Title	Optimization of the Educational Environment Using Information Technologies
Author	Mykhailo Sherman, Yaroslav Martynyshyn, Olena Khlystun, Liubov Chukhrai, Yuliia Kliuchko, Uliana Savkiv
Citation	Vol. 21  No. 4  pp. 80-83
Keywords	information technology, communication technologies, education system, educational process, оptimization.