In November 2006, the plaintiff (an engineering consulting firm) entered into a written agreement with the defendant (a nursing home) to provide civil and structural engineering services for the expansion of the defendant's Belvedere Maternity Hospital on stands 6803 and 6804, Princess Road, Belvedere, Harare. The agreement was signed by W. Vengesayi for the plaintiff and Professor Zvandasara as Managing Director for the defendant. The plaintiff's scope of work included preparing preliminary proposals, developing planning documents, preparing tender documents, and general administration. The plaintiff completed the consolidation of two adjacent properties (approved by the City of Harare) and prepared designs and plans over approximately four years. However, construction did not commence due to squabbles among the defendant's Board members. In August 2010, the plaintiff submitted a fee note for $685,733.93 calculated at 4% of total works value per ZACE 2009 forms. Professor Zvandasara submitted the invoice to the Board, which directed him to negotiate a payment plan pending funding, but this never materialized. He was subsequently locked out of his office in September 2011. The defendant denied liability, claiming the agreement was invalid because the Managing Director lacked authority to bind the defendant, and that certain essential terms (particularly the fee calculation method) were not agreed upon.