California Code, Health and Safety Code - HSC § 78590

(a) “Firm” means any individual, firm, partnership, corporation, association, or other legal entity permitted by law to practice the profession of engineering, architecture, environmental, landscape architecture, construction project management, or land surveying.

(b) “Prequalified list” means a short list of professional service firms that possess the qualifications established by the department to perform a specific type of professional service, with each firm ranked in order of its qualifications and costs, pursuant to subdivision (c) of Section 78600.

(c) “Professional service” includes a professional service of an engineering, architectural, environmental, landscape architectural, construction project management, land surveying, or similar nature, as well as an incidental service that members of these professions and those in their employ may logically or justifiably perform.