This work starts with a brief overview of education in developing countries, to contextualise the use of the guidelines. Although this document is intended to be a practical tool, it is necessary to include some theoretical analysis of the concept of online assessment. This is given in Sections 3 and 4, together with the identification and description of relevant online assessment techniques. Section 5 presents ten principles for online assessment; these were the core focus of this work. Finally, some tools that may be useful for teachers and educators are identified and briefly described. Section 6 references learning management systems and online assessment, whilst Section 7 covers other online assessment resources. The following are appended: (1) Definitions and Types of Assessment; (2) Assessment Design within Curriculum Design; (3) Traditional Authentic Learning and Assessment Explained; (4) Bloom's Taxonomy; and (5) General Principles for Traditional Assessment.