Under Florida's Construction Lien Statute, parties involved in construction projects are classified by their title and position. Contractors have a direct contract with the property owner to improve the property. Subcontractors have a contract with a contractor rather than the owner. Design professionals like architects and engineers can file liens if they have a direct contract with the owner or if improvements were made. Laborers personally perform labor on site but do not provide materials or other labor. Suppliers only provide materials and do not perform labor. Knowing one's classification is important for understanding lien rights and obligations.