SIDs, STARs, and other abbreviated clearances have been developed because of the need to put as many aircraft as possible into and through the ATC system. To accomplish this, it becomes necessary to keep the radio transmissions as brief as possible; hence, the use of abbreviations like as filed, and the use of SIDs and STARs.Another reason for these SIDs, and such, is to put them down on paper in such a man ner as to simplify what otherwise could be a difficult clearance to copy, read back, under stand, and comply with. In order for this to work, however, pilots have the responsibility to thoroughly understand the restrictions involved.The Jeppesen Airway Manual introduction has this to say about SIDs: Pilots of IFR civil aircraft operation from locations where SID procedures are effective may expect ATC clearances containing a SID. Use of a SID requires possession of at least the textual description of the SID. Pilots not desiring to use the SID are expected to advise ATC. Notification may be accomplished by filing NO SID in the remarks section of the filed flight plan or by the less desirable method of verbally advising ATC.I can’t see any reason to turn down a SID as long as you have the required textual por tion in your possession and your aircraft can meet the various restrictions, which are ex plained later. Turning it down will only make more work for everyone involved. If you filed NO SID, the only difference is that you will get the complete textual portion read to you, and you’ll have to copy it down and read it back, which is sometimes very complicated and time-consuming. After all, ATC has devised the departure routings to expedite traffic and to give adequate separation between inbound and outbound flights, so it stands to reason that as long as you will be departing on that route anyway, you might as well make it easy on all concerned by having the SIDs in your possession and reviewing them before flight.1.SIDs, STARs are used to （ ） ．