What is Uniform access principle?

The uniform access principle of computer programming was put forth by Bertrand Meyer. It states "All services offered by a module should be available through a uniform notation, which does not betray whether they are implemented through storage or through computation". This principle applies generally to the syntax of object-oriented programming languages. In simpler form, it states that there should be no syntactical difference between working with an attribute, pre-computed property, or method/query of an object.

While most examples focus on the "read" aspect of the principle , Meyer shows that the "write" implications of the principle are harder to deal with in his monthly column on the Eiffel programming language official website.