What it does
The Constitution Act 1889 (WA) is the foundational statute that constituted Western Australia as a self-governing colony and, after Federation, as a State of the Commonwealth. At its core, s.2(1) provides that there shall be, in place of the former Legislative Council, a Legislative Council and a Legislative Assembly with power to make laws "for the peace, order, and good Government of the Colony of Western Australia and its Dependencies". Subsection (2) declares that the Parliament of Western Australia consists of the Queen (now the Crown) and the two Houses, while s.2(3) stipulates that every Bill must be presented to the Governor for assent and is of no effect without it (subject to the special procedures in s.73).
The Act allocates functions across seven Parts. Part I establishes the parliamentary machinery: the Governor's power to convene, prorogue and dissolve the Assembly (s.3), the requirement for annual sessions (s.4), the first meeting deadline (s.5), the original nomination of 15 members to the Council (s.6, now largely spent), tenure and resignation rules (ss.7-8), the election of presiding officers (ss.9, 15, 49), the oath or affirmation of allegiance (s.22 and Schedule E), standing orders (s.34), salaries (s.35) and privileges (s.36).
Part II preserves existing electoral laws for the Assembly (s.38) and requires electoral lists to record qualifications and residences (s.41). Part III (now largely spent) provided for the transition to an elected Council. Part IIIA defines the office of Governor as the Queen's representative, holding office during Her Majesty's pleasure (s.50(1)), and entrenches the office against abolition or alteration except in accordance with s.73(2). Section 51 clarifies that "Royal Sign Manual" means the Sovereign's handwritten signature.
Part IIIB, inserted in 1979, constitutionalises a system of elected local governing bodies (s.52) while preserving the Legislature's ability to define their powers and to deal with vacancies or areas not covered by the system (s.53).