A method of making a nonwoven fabric from a single polymer system comprising the steps of: melt extruding a crystallizable amorphous polymer from a first extruder and a second extruder through one or more spinnerets that form a first group of continuous filaments and a second group of continuous filaments to produce a plurality of fibers; subjecting the polymer to processing conditions that produce a first polymer component that is at least partially crystalline and a second polymer component that is substantially amorphous; depositing the fibers on a collection surface to form a web containing both said first polymer component and said second polymer component; bonding the fibers to one another to form a bonded nonwoven web in which the second polymer component softens and fuses to form bonds with the first polymer component; and effecting crystallization of the second polymer component so that in the resulting nonwoven fabric both said polymer components are at least partially crystalline; wherein said step of subjecting the polymer to processing conditions that produce first and second polymer components comprises: subjecting the first group of continuous filaments to stress that induces crystallization, and subjecting the second group of continuous filaments to stress insufficient to induce crystallization wherein the steps of subjecting the first and second groups of filaments to stress to induce or not induce crystallization comprises extruding the filaments at differing extrusion rates; or providing a reduction in the intrinsic viscosity of the polymer in the second extruder relative to the intrinsic viscosity of the polymer in the first extruder. melt extruding a crystallizable amorphous polymer from a first extruder and a second extruder through one or more spinnerets that form a first group of continuous filaments and a second group of continuous filaments to produce a plurality of fibers; subjecting the polymer to processing conditions that produce a first polymer component that is at least partially crystalline and a second polymer component that is substantially amorphous; depositing the fibers on a collection surface to form a web containing both said first polymer component and said second polymer component; bonding the fibers to one another to form a bonded nonwoven web in which the second polymer component softens and fuses to form bonds with the first polymer component; and effecting crystallization of the second polymer component so that in the resulting nonwoven fabric both said polymer components are at least partially crystalline; wherein said step of subjecting the polymer to processing conditions that produce first and second polymer components comprises: subjecting the first group of continuous filaments to stress that induces crystallization, and subjecting the second group of continuous filaments to stress insufficient to induce crystallization wherein the steps of subjecting the first and second groups of filaments to stress to induce or not induce crystallization comprises extruding the filaments at differing extrusion rates; or providing a reduction in the intrinsic viscosity of the polymer in the second extruder relative to the intrinsic viscosity of the polymer in the first extruder. subjecting the first group of continuous filaments to stress that induces crystallization, and subjecting the second group of continuous filaments to stress insufficient to induce crystallization wherein the steps of subjecting the first and second groups of filaments to stress to induce or not induce crystallization comprises extruding the filaments at differing extrusion rates; or providing a reduction in the intrinsic viscosity of the polymer in the second extruder relative to the intrinsic viscosity of the polymer in the first extruder.