Table 8: Adoption Relationships Between Systems P( Uses (x)| Uses (y)) z-test y x n(%) n > 50% OSS Client OS Browser 100 51 .0156***10 Web Server Browser 81 11 .5908*** Server OS Browser 73 4 .3858*** Web Server Server OS 60 2 .2972* Server OS Web Server 58 1 .8090 Client OS Web Server 58 1 .6368 Client OS Server OS 51 0 .1770 Browser Server OS 44 −1 .2401 Browser Web Server 43 −2 .6892 Web Server Client OS 29 −6 .4683 Browser Client OS 28 −11 .2424 Server OS Client OS 26 −4 .3858 Client OS More Than One 100 51 .0156*** Web Server More Than One 80 12 .3322*** Server OS More Than One 74 6 .1270*** Browser More Than One 57 3 .3574*** Proprietary Browser Client OS 100 51 .0156*** Server OS Client OS 100 51 .0156*** Web Server Client OS 100 51 .0156*** Client OS Browser 98 51 .0156*** Web Server Browser 97 51 .0156*** Server OS Browser 96 24 .1783*** Server OS Web Server 86 19 .6397*** Web Server Server OS 84 17 .9629*** Client OS Web Server 64 7 .8448*** Browser Web Server 64 7 .7645*** Client OS Server OS 60 2 .8158** Browser Server OS 59 2 .4865* Browser More Than One 100 51 .0156*** Client OS More Than One 99 51 .0156*** Web Server More Than One 96 51 .0156*** Server OS More Than One 94 35 .5233***