APPENDIX K ITF RULES OF TENNIS Decision: Sanctioning bodies may apply to the ITF to have on-court coaching  allowed. In events where on-court coaching is allowed  designated coaches  may enter the court and coach their players under procedures decided by the  sanctioning body. Player analysis technology  that is approved for play under the Rules of Tennis   must comply with the specifications in Appendix III. The International Tennis Federation shall rule on the question of whether  any such equipment is approved  or not approved. Such ruling may be  taken on its own initiative  or upon application by any party with a bona fide  interest therein  including any player  equipment manufacturer or National  Association or members thereof. Such rulings and applications shall be made  in accordance with the applicable Review and Hearing Procedures of the  International Tennis Federation. 31. PLAYER ANALYSIS TECHNOLOGY  AMENDMENT TO THE RULES OF TENNIS (Article 28 of the Constitution of ITF Ltd) The official and decisive text to the Rules of Tennis shall be for ever in the English  language and no alteration or interpretation of such Rules shall be made except  at an Annual General Meeting of the Council  nor unless notice of the Resolution  embodying such alterations shall have been received by the ITF in accordance with  Article 17 and such Resolution or one having the like effect shall be carried by a  majority of two-thirds of the votes recorded in respect of the same. Any alteration so made shall take effect as from the first day of January following   unless the Meeting shall by the like majority decide otherwise. The Board of Directors shall have power  however  to settle all urgent questions  of interpretation subject to confirmation at the General Meeting next following. This text shall not be altered at any time without the unanimous consent of a  General Meeting of the Council. For all measurements in Appendix I  SI units shall take precedence. APPENDIX I THE BALL a.  The ball shall have a uniform outer surface consisting of a fabric cover  except for the Stage 3 (Red) foam ball. If there are any seams they shall  be stitchless. 461