en پژوهشي Research <span style="FONT-SIZE: 16pt FONT-FAMILY: "Rockwell Extra Bold" mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: FA mso-bidi-font-family: 'Times New Roman' text-shadow: auto"><span style="FONT-SIZE: 11pt FONT-FAMILY: "Times New Roman" mso-fareast-font-family: 'Times New Roman' mso-ansi-language: EN-US mso-fareast-language: EN-US mso-bidi-language: FA">The Materials Requirements Planning (MRP) method that is applied in production planning and management has some weaknesses. One of <font face="Times New Roman"><font size="3"><span style="COLOR: black">its</span><span style="COLOR: #339966"> </span></font>weaknesses is that the time in MRP method is discrete, and is considered as time period. Hence we are not able to order our requirements at irregular time moments or periods. In this paper, a new form of MRP is introduced that is named Continuous Materials Requirements Planning (CMRP) approach. We discuss the disadvantages of Discrete MRP (DMRP) approach and analyze the conditions, applications and the manner of applying CMRP approach in our problems<span style="COLOR: black"><font size="3">.</font></span></font></span></span> Discrete Materials Requirements Planning (DMRP), Continuous Materials Requirements Planning (CMRP), Order Type (OT), Lot for Lot (L4L) 17 22 http://ijiepr.iust.ac.ir/browse.php?a_code=A-10-1-97&slc_lang=en&sid=1 Ramin Sadeghian rsadeghian@basu.ac.ir 18003194753284600582 18003194753284600582 Yes