Whatif is an online planning and tracking tool as well as an scenario tool.

Objectives are reasons for actions or series of actions either sequential or concurrent

States allow assessment of state members

A State has a specific time
A State can be split by location
A State has State members
A State conicides with at least one state member changing state

State members are actions or external changes instrumental/of influence to achieving an objective.

State members are linked serially

State members have properties
State objective (what is to be achieved)
State action (what is the action)
State description (long and short)
State location
State Change Type (Start, External, Action, End)
a start time
end time

actor (person or organization)

An Objective is entered as a new state member, Type End.
There can only be one End type state.
A state member with end state asks for a start date.
Start date can be split to create intermediate steps.
Next and previous per state member allow positioning of intermediate steps.
Different actors allow state members to share an end or intermediate state (Split actors).
Actors are reconciled at some point, initially assumed the next planned state change.