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Augmented Reality (AR) technologies are often perceived as the most impactfulmethod to enhance the communication between the designer and the client duringthe iterative design process. However, the significance of designing the UserInterface (UI) and the User Experience (UX) are often underestimated. Tointercede, this research aims to employ new and existing techniques to developUI's, and comparatively assess ``the accuracy and completeness with whichspecified users can achieve specified goals in particular environments'' (Stone,2005) - a notion this research delineates as `effectiveness'. Prompted by the workof key scholars, the developed UI's were assessed through the lens of existing UIevaluation techniques, including: Usability Heuristics (Nielsen, 1994) and Visualand Cognitive Heuristics (Zuk and Carpendale, 2006). In partnership with PTWArchitects, characteristics such as the rapidity and complexity of interactions, inconjunction with the interface's simplicity and intuitiveness, were extracted from15 trials underwent by architectural practitioners. The outcomes of this researchhighlights strategies for the effective development of user interface design formobile augmented reality applications.