references:
1- https://airccj.org/CSCP/vol7/csit77001.pdf

2- file:///C:/Users/SONY/AppData/Local/Temp/Usability_Evaluation_of_an_Educational_Website_in_.pdf

3- K.  Orfanou,  N.  Tselios,  and  C.  Katsanos,  “Perceived  usability  evaluation  of  learning  management systems: Empirical evaluation of the System Usability  Scale,” The International  Review  of Research in Open and Distributed Learning, vol. 16, 2015.

4- M.  Alshammari,  R.  Anane,  and  R.  J.  Hendley,  “Design  and  Usability  Evaluation  of  Adaptive  e-learning Systems Based on Learner Knowledge and Learning Style,” in Human-Computer Interaction, 2015, pp. 584-591.

5- S.  H.  Mustafa  and  L.  F.  Al-Zouabi,  “Usability  of  the  academic  websites  of  Jordan’s  universities an evaluation  study,”  in  Proceedings  of  the  9th  International  Arab  Conference  for  Information Technology, 2008, pp. 31-40.

6- S. Kaur, K. Kaur, and P. Kaur, “Analysis of website usability evaluation methods,” in Computing for Sustainable  Global  Development  (INDIACom),  2016  3rd  International  Conference  on,  2016,  pp. 1043-1046.

7- M.  Y.  Ivory  and  A.  Chevalier,  “A  study  of  automated  web  site  evaluation  tools,”  University  of Washington, Department of Computer Science2002, 2002.

8- F.  Oliha,  “Web  portal  usability  among  Nigerian  university  students:  A  case  study  of  University  ofBenin, Nigeria,” Nigerian Journal of Technology, vol. 33, pp. 199-206, 2014.

9- Noiwan, J., Norcio, A. (2000). A comparison analysis on web heuristic usability between Thai academic web sites  and  US  academic  web  sites. Proceedings  of  SGI,  World  Multi  Conference  on  Systems, Cybermetrics  and  Informatics.  Concepts  and  Applications  of  Systems,  Cybermetrics  and  Informatics, Orlando, Florida, USA, 536541

10- Kostaras, N., Xenos, M. (2006). Assessing educational web-site  usability  using  heuristic  evaluation rules. Proceedings of 11th Panhellenic Conference in Informatics