One is quasi-active, like the flu example I gave, where we get some people to nominate their friends and then passively monitor their friends -- do they have the flu, or not? -- and then get warning.
Berikutnya, quasi-aktif, seperti contoh flu di atas, kita meminta beberapa orang menominasikan teman mereka secara pasif memantau teman mereka -- apakah terkena flu atau tidak? -- dan mendapat peringatan awal.