Note: "The words synopsis, treatments and outlines are often used synonymously. 
All three are written pitches of slightly different lengths," says David Trottier. 

As for the ASA perspective, in doing our research we received several different answers from learned professionals as to what these industry tools are exactly, so don't be surprised if you hear varying opinions on the meanings and use of loglines, synopsis and treatments.

In short, Treatments are very thorough summaries of the movie (a long synopsis if you will), in present tense prose, and without dialogue. Spec treatments normally run two to seven pages in length - most people prefer three to four pages, and are not NOT scene by scene summaries. These spec treatments are different than the longer treatments a writer is paid to write in a development deal, which we will discuss later below. Synopses are usually one or two page story summaries that describe the situation, main characters and important action. Loglines are one or two enticing concept sentences, about 25-35 words total, to convince someone to request the script.