A systematic method for measuring construction time performance has been developed. This enables comparisons between individual project performances and best practice worldwide. Four factors affect construction time performance: construction management effectiveness, the sophistication of the client and the client's representative in terms of creating and maintaining positive project team relationships with the construction management and design team, design team effectiveness in communicating with construction management and client's representative teams, and a small number of factors describing project scope and complexity. This research has indicated that construction management team performance plays a pivotal role in determining construction time performance. It also reveals an important relationship between sound client's representative management effectiveness and good construction time performance. Detailed findings provide useful performance indicators that may be used to assist in defining benchmark measures necessary to assess a project's performance relative to a representative population.