A rule-based programming language may be devised for programming an entity in an environment. Computer systems may therefore be configured to program the entity with at least one rule comprising at least zero language conditions representing an action condition, at least one language verb representing an action, and at least zero language verb parameters representing an action object. The computer system may also be configured to facilitate entry by a user of a rule set according to the rule-based programming language by receiving user selections of language conditions, language verbs, and language verb parameters. By facilitating the programming by users of entities within environments, the computer system may facilitate individuals (such as non-technical individuals, aspiring programmers, and children) in understanding programming concepts, encourage the development of experience with computer programming, and permit the generation of useful computer programs by non-proficient programmers.