Exhibit 99.1
                           Excplanation of Responses

(1) Pro rata distribution from Warburg Pincus Ventures, L.P. to its limited
partners. As a part of this distribution, Warburg, Pincus Ventures, L.P. also
distributed 108,474 shares of Knoll, Inc. common stock to its general partner
Warburg Pincus Partners LLC. The shares distributed to Warburg Pincus Partners
LLC are not reflected in Table I as such shares continue to be owned by a
Warburg Pincus entity.

(2) The stockholders are Warburg, Pincus Ventures, L.P., a Delaware limited
partnership ("WPV"), Warburg Pincus & Co., a New York general partnership ("WP")
and Warburg Pincus Partners LLC, a New York limited liability company ("WPP").
The sole general partner of WPV is WPP, whose managing member is WP. Warburg
Pincus LLC, a New York limited liability company ("WP LLC" and together with
WPV, WPP and WP, the "Warburg Pincus Entities"), manages WPV. Charles R. Kaye
and Joseph P. Landy are Managing General Partners of WP and Managing Members of
WP LLC and may be deemed to control the Warburg Pincus Entities. Messrs. Kaye
and Landy disclaim beneficial ownership of all shares held by the Warburg Pincus
Entities. Jeffrey Harris, a director of Knoll, Inc., is a general partner of WP
and a managing director and member of WP LLC. All shares indicated as owned by
Mr. Harris are included because of his affiliation with the Warburg Pincus
Entities. By reason of such affiliation, Mr. Harris may be deemed to have an
indirect pecuniary interest within the meaning of Rule 16a-1 of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), in an indeterminate
portion of the shares reported herein. Mr. Harris disclaims "beneficial
ownership" of such shares within the meaning of Rule 13d-3 under the Exchange
Act.