There are many issues that need to be considered if you wish to secure Web Services. These are examined by the papers at [13], [18], [20] and [46].

Of course, writing a program in terms of a Web Service means that the program is dependent on a connection to the internet, the availability of the computer and the webserver of the Web Service, whether the Web Service still maintains the same contract as when the program was written, ... . Some of these reliability issues are addressed by the papers at [19] and [22].