Term correctly refused to redact from these letters the nonmedical materials which plaintiff asserts are either material prepared for litigation (CPLR 3101, subd [d]), attorney’s work product (CPLR 3101, subd [c]), or simply without relevance. Special Term enjoys a broad range of discretion in supervising disclosure
(Maggio v State of New York, 88 AD2d 1087 ,1088;
Jackson v Nelson, 81 AD2d 677 ) and CPLR 3101 (subd [a]) mandates “full disclosure of all evidence material and necessary in the prosecution or defense of an action”, which section is to be interpreted liberally in favor of disclosure
(Allen v Crowell-Collier Pub. Co., 21 NY2d 403 , 406-407). Plaintiff insists that discovery should be limited solely to the portion of each letter pertaining to an account of the injuries. Having placed her physical condition in controversy, plaintiff clearly may not insulate from disclosure material necessary to the defense concerning that condition (see
Hoenig v Westphal, 52 NY2d 605 , 610,
supra). The burden of demonstrating that particular items are immune from discovery is upon the party asserting immunity and the mere assertion that items constitute attorney’s work product or material prepared for litigation will not suffice
(Koump v Smith, 25 NY2d 287 , 294;
Zimmerman v Nassau Hosp., 76 AD2d 921 ). Here, plaintiff argues that the letters are exempt as material prepared for litigation since they were written at her. attorney’s request solely to urge Dr. Drew to send a medical report to the attorney. While a reading of the letters shows they were in part motivated to obtain medical reports directed toward litigation, an additional motivation is readily apparent. In an affidavit, plaintiff conceded that the letters were submitted to Dr. Drew “to keep him abreast of my condition”. The discussion of plaintiff’s physical condition in each letter supports this assessment. In effect, the letters may be characterized as multimotivated and thus not exempt from discovery (see
Zimmerman v Nassau Hosp., 76 AD2d 921 ,
supra; Carlo v Queens Tr. Corp., 76 AD2d 824 ;
Chemical Bank v National Union Fire Ins. Co. of Pittsburgh, Pa., 70 AD2d 837 ; Siegel, NY Prac., § 348, p 430). Moreover, plaintiff failed to disclose all of the medically related portions of the letters. This is significant since Dr. Drew clearly utilized the letters in forming his opinion of plaintiff’s condition. Thus, Special Term’s conclusion that Dr. Drew’s use of these letters and reference to them in his report render them discoverable is correct. Nor are we persuaded by plaintiff’s contention that the letters are exempt as attorney’s work product (CPLR 3101, subd [c]) because they contain the attorney’s instructions and impressions. The “work product” of an attorney is a very narrowly construed concept
(Chemical Bank v National Union Fire Ins. Co. of Pittsburgh, Pa., 70 AD2d 837 ,
supra; Siegel, NY Prac, § 347, p 426), including only materials prepared by an attorney, acting as an attorney, which contain his analysis and trial strategy
(Kenford Co. v County of Erie, 55 AD2d 466 , 470). Clearly, these letters do not fall within the “work product” exemption. Finally, since Dr. Drew’s opinion derives in large part from the history of complaints and treatment outlined throughout the letters, a proper understanding of this material requires that defendant be allowed to review the material in context. Accordingly, we find no abuse of discretion in Special Term’s order granting full disclosure. Order affirmed, without costs. Main, J. P., Casey, Mikoll, Yesawich, Jr., and Weiss, JJ., concur.