In spite of the necessity for variety in spacing between groups, it must be achieved only after due consideration of how varying amounts of space are to be placed. Space is used to separate one thought or section of copy from another, therefore the amount of space should be varied according to how isolated one thought is from another. The readability of a piece of printed matter can be assisted or marred by the placing of the space between lines or groups. Display Display setting is the highest form of punctuation, this is where spacing of groups is applied. Keep to a minimum the number of groups in a job, as the fewer groups in a job, the easier readability is achieved.
Most jobs require no more than three groups.
To express these ideas in a simple way, we place space between lines or groups of equal in value to the degree of punctuation that would be otherwise used if the setting were solid, i.e. small space for comma, large space for full point, etc. The space is much more discernible than the punctuation mark. In addition, in display we emphasise items according to their importance by the use of larger or bolder type faces. It is a good idea to refrain from excessive space which causes detachment of units, as too many points of interest in a printed piece cause difficulty in reading. However carefully the arrangement of solidly set text matter may have been planned, with reference to type size and measure for example, and however carefully that matter is subsequently set, it can almost always be made even more readable by sensible leading.