I am trying to use RAD for our school project and i was searching for a model diagram to follow but i found 2

1st is the ladder type found here:

2nd is this one found here:

so i'm really confuse as to which one i should follow here, also how will i assign my task in accordance to RAD model.

if i follow the 1st one 3 developers will do 3 task simultaneously as stated by the link above that ladder increment type model states that numerous software teams works in parallel on different system functions.

while on the other hand the 2nd option from what i can understand from the diagram user design and implementation "or construction" will be repeated until a satisfactory outcome is reached and thus it will proceed to the last step which is the cutover or "implementation", this too is what RAD or agile models are for to be able to adjust to change accordingly during the development period.