delivered the opinion of the Court.
Defendents were arrested on November 28, 1977, and subsequently charged with the crime of criminal possession with intent to sell dangerous drugs. Trial was set by the District Court for October 10, 1978, some ten and one-half months, or 317 days, after arrest. On September 26, 1978, defendant Puzio moved to dismiss the matter for lack of a speedy trial. The District Court granted the motion. The State appeals under section 95-2403, R.C.M.1947, now section 46-20-103 MCA.
Before considering the speedy trial issue, however, we must clarify a question of the record we will consider. Both parties in their briefs make statements of fact concerning the parole revo: cation of defendant Puzio which are not supported in the record. The parties on appeal are bound by the record and may not add additional facts in their briefs or by appendices thereto. Thrift v. Thrift (1918), 54 Mont. 463, 171 P. 272; Farmers State Bank of Conrad v. Iverson (1973), 162 Mont. 130, 509 P.2d 839. The statements of fact not contained in the record concerning the parole revocation of defendant Puzio have not been considered.
In State v. Tiedemann (1978), 178 Mont. 394, 584 P.2d 1284, 1287, this Court discussed the right to a speedy trial:
“The right to a speedy trial is guaranteed by both the United States and Montana Constitutions. U.S.Const., Amend. VI; 1972 Mont. Const, art. II, § 24. The right to a speedy trial is fundamental, Klopfer v. North Carolina (1967), 386 U.S. 213, 223, 87 S.Ct. 988, 993, 18 L.Ed.2d 1, 8, and the federal standard, as a minimum, is imposed by the due process clause of the Fourteenth *165Amendment on the states. See Dickey v. Florida (1970), 398 U.S. 30, 90 S.Ct. 1564, 26 L.Ed.2d 26; Smith v. Hooey (1969), 393 U.S. 374, 89 S.Ct. 575, 21 L.Ed.2d 607.
“The touchstone in any analysis of the speedy trial issue is Barker v. Wingo (1972), 407 U.S. 514, 530, 92 S.Ct. 2182, 2192, 33 L.Ed.2d 101, 116-17, in which the Supreme Court set out a four factor balancing approach with the conduct of both prosecution and defense being weighed. The four factors to be considered are:
“(1) Length of delay;
“(2) Reason for the delay;
“(3) Defendant’s assertion of the right; and,
“(4) Prejudice to the defendant.
“The Court emphasized the necessity of balancing the factors:
“ ‘We regard none of the four factors identified above as either a necessary or sufficient condition to the finding of a deprivation of the right of speedy trial. Rather, they are related factors and must be considered together with such other circumstances as may be relevant. In sum, these factors have no talismanic qualities; courts must still engage in a difficult and sensitive balancing process.’ 407 U.S. at 533, 92 S.Ct. at 2193, 33 L.Ed.2d at 118.
“This Court has adopted and applied the four factor balancing test of Barker in a series of decisions dating back to 1973. See State v. Collins (1978), 178 Mont. 36, 582 P.2d 1179; State v. Cassidy (1978), 176 Mont. 385, 578 P.2d 735, 737; State ex rel. Briceno v. District Court (1977), 173 Mont. 516, 568 P.2d 162, 164; State v. Keller (1976), 170 Mont. 372, 377, 553 P.2d 1013, 1016; State ex rel. Sanford v. District Court (1976), 170 Mont. 196, 199, 551 P.2d 1005, 1007; State v. Steward (1975), 168 Mont. 385, 389, 543 P.2d 178, 181; Fitzpatrick v. Crist (1974), 165 Mont. 382, 388, 528 P.2d 1322, 1325; State v. Sanders (1973), 163 Mont. 209, 213, 516 P.2d 372, 375. We reaffirm our support of this test as the correct and most complete standard available to judge speedy trial questions.”
The Court in Tiedemann then went on to discuss the first factor, length of delay:
*166“Length of delay. Length of delay has been referred to as the trigger setting off the speedy trial issue inquiry:
“ ‘The length of the delay is to some extent a triggering mechanism. Until there is some delay which is presumptively prejudicial, there is no necessity for inquiry into the other factors that go into the balance. Nevertheless, because of the imprecision of the right to speedy trial, the length of delay that will provoke such an inquiry is necessarily dependent upon the peculiar circumstances of the case.’ Barker, 407 U.S. at 530-31, 92 S.Ct. at 2192, 33 L.Ed.2d at 117. “Accord, Keller, 170 Mont, at 377, 553 P.2d at 1017; Steward, 168 Mont, at 389, 543 P.2d at 181.” 584 P.2d at 1287-88.
In the instant cáse, the time lapse is sufficient to trigger an inquiry into the other three factors of the balancing test. The delay (317 days, ten and one-half months, from date of arrest to date set for trial) is longer than or comparable to the delays found sufficient to warrant dismissal in Fitzpatrick (seven months), Cassidy (eight months), Sanford (ten months), Briceno (ten and one-half months), and Keller (eleven months). “The length of delay thus shifts the burden to the State of explaining the reason for the delay and showing absence of prejudice to defendant.” Tiedemann, 584 P.2d at 1288. See also Cassidy, 578 P.2d at 738; Sanford, 170 Mont. at 200, 551 P.2d at 1007; and Fitzpatrick, 165 Mont. at 388, 528 P.2d at 1326.
Reason for the delay. The parties agree that neither defendants nor the county attorney’s office was the cause of any great delay in this case. They contend that the main reason for the delay was crowded court dockets and inadequate calendaring procedures. We agree.
Judge Sande had jurisdiction of the case at two different times as did Judge Luedke. Both Judge Wilson and Judge Martin assumed jurisdiction once. The main cause of the delay was that the case simply sat from the time Judge Wilson assumed jurisdiction in April 1978 until he excused himself August 9, 1978. On August 16, 1978, Judge Sande again assumed jurisdiction and was again sub*167stituted by defendant Puzio. Judge Luedke again assumed jurisdiction, and the matter was eventually set for trial on October 10, 1978.
The State argues it prosecuted the case with reasonable diligence and should not be responsible for crowded court dockets and the method of scheduling trials. We do not agree. The court in Cassidy flatly held that this position of the State is without merit. 578 P.2d at 738. The situation here is very similar to that found in Briceno in that the matter simply sat on the calendar from April 1978 until it was eventually set for trial in October 1978.
In United States v. Jones (1975), 173 U.S. App.D.C. 280, 524, F.2d 834, 849, the Court stated:
“. . . The Supreme Court has held that delays due to the operation of the system also must be placed at the Government’s door, stating in Barker v. Wingo:
“ ‘A defendant has no duty to bring himself to trial; the State has that duty as well as the duty of insuring that the trial is consistent with due process . . .[T]he rule we announce today, which comports with constitutional principles, places the primary burden on the courts and the prosecutors to assure that cases are brought to trial.’ ”
We find that delays inherent in the system are not chargeable to defendants but rather to the State. The type of institutional delays we have herein enumerated, where a case is allowed to merely sit awaiting trial, cannot be overlooked, absent counterbalancing factors.
Defendants’ assertion of rights. We find that defendants asserted their rights properly under the guidelines set forth by this Court in State v. Steward (1975), 168 Mont. 385, 543 P.2d 178.
The following statement by this Court in Cassidy is dispositive on this factor:
“3. Defendant’s Assertion of the Right.
“The State argues, in this regard, that defendant has failed to expedite the proceedings in this case through any active pleadings *168before the District Court, such as by requesting an earlier trial date. In addition, it is maintained that defendant’s motion to dismiss for denial of a speedy trial was untimely, and should have been made at some point between entry of plea and the setting of the trial date. The State does not specifically contend, however, that defendant in some manner waived his right to assert a denial of a speedy trial.
“It is, of course, the general rule under the present state of the law that ‘. . . an accused must take some affirmative action to obtain a trial to be entitled to á discharge for delay.’ State v. Steward, 168 Mont. 390, 543 P.2d 182. Such burden is satisfied, however, by the making of an appropriate motion, discussed by this Court in Steward as follows:
“ ‘The “appropriate motion” is a motion to dismiss for denial of a speedy trial. The proper time to assert the right to a speedy trial is prior to the actual commencement of the trial, usually at the time the trial date is set, or the time the case is called to trial . . .’ 168 Mont. 390-91, 543 P.2d 182.
“Defendant’s assertion of the right in this case was in all respects proper under the standard outlined in Steward, having been made between the time the matter was set for trial and the trial date itself.” 578 P.2d at 739.
Prejudice to defendants. The final factor to be considered in the balancing process is the question of whether defendants were prejudiced by the delay. This prejudice is further defined in Barker:
“Prejudice, of course, should be assessed in light of the interests of defendants which the speedy trial right was designed to protect. This Court has identified three such interests: (i) to prevent oppressive pretrial incarceration; (ii) to minimize anxiety and concern of the accused; and (iii) to limit the possibility that the defense will be impaired.” 407 U.S. at 532, 92 S.Ct. at 2193, 33 L.Ed.2d at 118.
With regard to oppressive pretrial incarceration, defendant Puzio has been incarcerated since the day of his arrest. Defendant Allen was not incarcerated prior to trial. Puzio was detained in the *169Yellowstone County jail away from his family and friends during the entire Christmas and New Year’s holidays. Then he was given a parole revocation and was removed from the county jail to the state prison. He was then returned to Yellowstone County by the sheriff for each of his court appearances and returned to the prison.
The second item to be considered is the anxiety and concern of the accused. Here, the delay of 317 days, along with Puzio’s removal from Billings across the state to Deer Lodge, and the inability to communicate by telephone were reasons for Puzio to have a great deal of concern about the progress in his case, and a great deal of concern about the preparation of his defense.
The last consideration under prejudice to the defendants is the possibility that the defense will be impaired. Barker states that this concern is the most serious because the inability of a defendant adequately to prepare his case skews the fairness of the entire system. The court in Barker commented on the possibility of witnesses dying, witnesses unable to recall accurately events of the distant past, and loss of memory.
These items are always a problem because the record does not always reflect what has been forgotten. In this particular case, Puzio has been incarcerated in the state prison, a great distance from his defense counsel and the scene of the crime. He has not been able to assist in the preparation of his defense except by letter. Further, with regard to memory, the State is the only benefactor since its policy usually requires witnesses to type their statements and scenarios of activity which are used to refresh their recollection. However, lay witnesses called by the defendants rarely have their past recollections refreshed by statements and scenarios prepared by them at the time the events occurred, which, in this case, was November 28, 1977 — two days after Thanksgiving.
We find that Puzio has been incarcerated the entire time since his arrest on November 28, 1977, demonstrates affirmative prejudice against him.
We reemphasize that we are engaged in a delicate balancing process. The presence of prejudice in this case should be weighed heavily in the balancing of all factors.
*170On balance, we find there has been excessive delay in bringing this case to trial; the State has failed to explain satisfactorily the reasons for the delay; the defendants properly and timely asserted their right to a speedy trial; and, prejudice to defendent Puzio has resulted by reason of the delay.
We believe the comments of now Chief Justice Haswell in Keller, as set forth in Tiedemann again bear repeating:
“This Court, as well as many other courts, has often stated that society at large, as well as the individual defendant, has a stake in the speedy disposition of criminal matters. E. g., Barker, 407 U.S. at 519-21, 92 S.Ct. at 2186-87, 33 L.Ed.2d at 110-11. In view of the result in this case, the comments of now Chief Justice Haswell in Keller bear repeating:
“ ‘. . . Delayed criminal justice proceedings are undermining public confidence in the system itself. Justice delayed may not only be justice denied but justice brought seriously under question. The backbone of law enforcement and the justice system is public support. The courts must not permit the erosion of that support by permitting unnecessary delay between charge and conviction or release’. . .” Tiedemann, 584 P.2d at 1292-93.
We stated further in Tiedemann:
“While we will not tolerate undue delay in the prosecution of an individual defendant, neither will society long tolerate dismissal of criminal charges for lack of speedy trial. Prosecutors and courts must work to avoid the kind of result we reach today.” 584 P.2d at 1293.
We recommend that the judges of the Thirteenth Judicial District of the State of Montana would do well to cooperate to the extent that the situation that occurred in this case is not repeated.
The judgment of the District Court dimissing the charges for lack of a speedy trial is affirmed.
MR. CHIEF JUSTICE HASWELL and JUSTICES DALY, SHEA and SHEEHY concur.