A method of forming a multi-component reinforced composite, the method comprising: (i) forming a first particle-reinforced component, wherein the first particle reinforced component is formed by a first process comprising: - providing reactive particles that have a reactive polymerization promoter chemically bonded or coated on a surface of the reactive particles; - contacting the reactive particles with a resin solution comprising monomers of a polymer, wherein the polymerization promoter promotes the polymerization of the monomers; and - polymerizing the resin solution to form a polymer matrix around the reactive particles and form the first particle reinforced component; and (ii) forming a second polymer-containing component in contact with the first particle-reinforced component by - introducing a second resin solution comprising monomers of a polymer; and - polymerizing the second resin solution to form the second-polymer-containing component comprising a thermoset polymer or - contacting the first particle-reinforced component with a thermoplastic material; and - setting the thermoplastic material in contact with the first-particle reinforced component to form the second polymer-containing component comprising a thermoplastic polymer, the setting of the thermoplastic material comprises cooling the thermoplastic polymer to a temperature where it solidifies to form the second polymer-containing component. (i) forming a first particle-reinforced component, wherein the first particle reinforced component is formed by a first process comprising: - providing reactive particles that have a reactive polymerization promoter chemically bonded or coated on a surface of the reactive particles; - contacting the reactive particles with a resin solution comprising monomers of a polymer, wherein the polymerization promoter promotes the polymerization of the monomers; and - polymerizing the resin solution to form a polymer matrix around the reactive particles and form the first particle reinforced component; and - providing reactive particles that have a reactive polymerization promoter chemically bonded or coated on a surface of the reactive particles; - contacting the reactive particles with a resin solution comprising monomers of a polymer, wherein the polymerization promoter promotes the polymerization of the monomers; and - polymerizing the resin solution to form a polymer matrix around the reactive particles and form the first particle reinforced component; and (ii) forming a second polymer-containing component in contact with the first particle-reinforced component by - introducing a second resin solution comprising monomers of a polymer; and - polymerizing the second resin solution to form the second-polymer-containing component comprising a thermoset polymer or - contacting the first particle-reinforced component with a thermoplastic material; and - setting the thermoplastic material in contact with the first-particle reinforced component to form the second polymer-containing component comprising a thermoplastic polymer, the setting of the thermoplastic material comprises cooling the thermoplastic polymer to a temperature where it solidifies to form the second polymer-containing component. - introducing a second resin solution comprising monomers of a polymer; and - polymerizing the second resin solution to form the second-polymer-containing component comprising a thermoset polymer or - contacting the first particle-reinforced component with a thermoplastic material; and - setting the thermoplastic material in contact with the first-particle reinforced component to form the second polymer-containing component comprising a thermoplastic polymer, the setting of the thermoplastic material comprises cooling the thermoplastic polymer to a temperature where it solidifies to form the second polymer-containing component.