Much of the thinking that is continously going on in a person’s mind involves planning for the future, both near term and long term. Mishlei advises that a person should never initiate important activity without thinking it through carefully in advance and, if appropriate consulting with others.
Three planning modes are identified in the proverb given here.
The first planning mode consists of the options that are under consideration. They are referred to by the general term: thoughts (machashavos).
The second mode consists of choices that have been tentatively or firmly made for a particular course of action. These choices, which may be made in consultation with another person, are referred to as counsel (eitzos).
The third planning mode consists of specific stratagems associated with anticipated contingencies. These stratagems are referred to as tachbulos. Typically, strategems involve deep thinking and intense analysis. They are often applied to military or wartime situations. They are also employed by people who are involved in planning criminal activities.
יח = מַחֲשָׁבוֹת בְּעֵצָה תִכּוֹן וּבְתַחְבֻּלוֹת עֲשֵׂה מִלְחָמָה
(18) Thoughts of planning options are typically firmed up in consultation
but are extended with contingency plans to wage war.
The three planning modes are also discussed in Mishlei 12-05. However, in that proverb, the third mode is associated with criminal activity, especially involving deceptive alternatives.
(18) Thoughts of options under consideration — מַחֲשָׁבוֹת
are firmed up in consultation to become plans. —בְּעֵצָה תִכּוֹן
And they become contingency plans. — וּבְתַחְבֻּלוֹת
To wage war — עֲשֵׂה מִלְחָמָה. ּ
 Before seeking counsel, the first step is מַחֲשָׁבוֹת, careful independent thought by the person who is directly involved. The person should carefully analyze all positive and negative aspects of the situation before seeking outside counsel (בְּעֵצָה) to make sure that no options have been overlooked. (רבינו יונה)
 However, even the wisest person should be prepared to consult with others, for any one can subconsciously overlook matters that affect him personally. (מאירי)
 In planning war strategy, one must carefully consider the likelihood that the enemy is going through a similar process. Every possible move by the opposing side must be taken into account. (רבינו יונה)
 Wartime planning also has to take into acount methods of misleading the enemy and preventing leaks that might be picked up by their spies. (אלשיך)
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