Modern web applications often contain three or more tiers and depending on the size of the team a developer works on, he or she may specialize in one or more of these tiers – or may take a more interdisciplinary role. For example, in a two-person team, one developer may focus on the technologies sent to the client such as HTML, JavaScript, CSS, and on the server-side frameworks in PHP and Java used to deliver content and scripts to the client. Meanwhile, the other developer might focus on the interaction between server-side frameworks, the web server, and a database system. Further, depending on the size of their organization, the aforementioned developers might work closely with a content creator/copy writer, marketing advisor, user experience designer, web designer, web producer, project manager, software architect, or database administrator or they may be responsible for such tasks as web design and project management themselves.