Publication website and DVD are cost effective way of reaching a large numbers of people. Publication can come in the form of brochures , leaflets, fact-sheets, map, books, posters, postcard, calendars and sticker . Publication tend to be based around information rather than interpretation. For example ,the standard brochure promoting a region or site tends to be more information orient. Nonetheless ,there have been some highly interpretive posters that use layered presentations of images and ideas to progressively reveal underlying . Website and DVD on the other hand have the ability to combine information and interpretation by including interactive activities , moving image and text .some of the disadvantages of the disadvantages of publication , Website and DVD are that they have limited capacity to respond to different visitor needs, they can be difficult to distribute and mange and they can quickly go out of date requiring regular updating and upgrading.