Hardie plank siding is a premium brand of cement board siding (also known as fiber cement board siding) produced by the James Hardie Company.ardie plank can be purchased with a wood-grain look, a plain smooth look or a stucco type finish. Hardie plank also comes in simulated cedar shingle planks.
activity duration. Period (hours, days, weeks) required to complete an activity. Activities with zero duration are called milestones.
Relevant range. is the volume of activity over which cost behavior stays valid. For example, fixed costs remain constant only within a certain range of activity volume (i.e., the relevant range); if this activity volume is overcome, fixed costs may change.