The word "project" comes from the Latin word "projectum" from "projicere", "to throw something forwards" which in turn comes from "pro-", which denotes something that precedes the action of the next part of the word in time (paralleling the Greek πρό) and "jacere", "to throw". The word "project" thus actually originally meant "something that comes before anything else is done". When the word was initially adopted, it referred to a plan of something, not to the act of actually carrying this plan out. Something performed in accordance with a project was called an object. This use of "project" changed in the 1950s when several techniques for project management were introduced. With this advent the word slightly changed meaning to cover both projects and objects. However, in certain projects there may still exist so called "objects" and "object leaders", reflecting the older use of the words.